Document:

Exhibit 4.2

 

SUMMARY OF THE AMENDED AND RESTATED CREDIT
AGREEMENT

 

As publicly disclosed by
GCS on August 10, 2011, on such date GCS entered into an Amendment Agreement with regard to the Credit Agreement dated August 30,
2010, by means of which GCS had obtained the necessary funds to complete the acquisition of Farmacias Ahumada, S.A. in Chile. The
parties to the agreement are as follows: (i) Grupo Casa Saba, S.A.B. de C.V. as borrower; (ii) Casa Saba, S.A. de C.V., Drogueros,
S.A. de C.V., Farmacias ABC de México, S.A. de C.V., Daltem Provee Nacional, S.A. de C.V., Publicaciones Citem, S.A. de
C.V., Daltem Provee Norte, S.A. de C.V., Centennial, S.A. de C.V. and Controladora Casa Saba, S.A. de C.V. as Co-Obligors; (iii)
HSBC México, S.A. Institución de Banca Múltiple, Grupo Financiero HSBC and Banco Mercantil del Norte, S.A.,
Institución de Banca Múltiple, Grupo Financiero Banorte as lenders, (iv) HSBC México, S.A. Institución
de Banca Múltiple, Grupo Financiero SHBC, División Fiduciaria as Mexican Collateral Agent; and (v) HSBC Bank (Chile)
as Chilean Collateral Agent. The effectiveness of such agreement was subject to the satisfaction of certain conditions precedent,
all of which were satisfied by GCS in September 2011. The Amended and Restated Credit Agreement includes the affirmative and negative
covenants that are customary for this type of transaction.

 

The following is a summary
of the principal terms and conditions of the Amended and Restated Credit Agreement.

 

The Loans.

 

As of the September 5,
2011 of the Amended and Restated Credit Agreement, the Aggregate Amount of the Loans was divided into two tranches, each in the
amount and with the characteristics set forth below:

 

(i)         Ps.3,939,167,424.45
(Three Billion Nine Hundred Thirty-Nine Million One Hundred Sixty-Seven Thousand Four Hundred Twenty Four Pesos 45/100) (“Tranche
1”), of which Ps.$994,500,000.00 (Nine Hundred Ninety-Four Million Five Hundred Thousand Pesos 00/100) would be funded
by Banorte and Ps.2,944,667,424.45 (Two Billion Nine Hundred Forty-Four Million Six Hundred Sixty-Seven Thousand Four Hundred Twenty-Four
Pesos 45/100) would be funded by HSBC México; and

 

(ii)        Ps.3,784,690,270.55
(Three Billion Seven Hundred Eighty-Four Million Six Hundred Ninety Thousand Two Hundred Seventy Pesos 55/100) (“Tranche
2”), of which Ps.955,500,000.00 (Nine Hundred Fifty-Five Million Five Hundred Thousand Pesos 00/100) would be funded
by Banorte and Ps.2,829,190,270.55 (Two Billion Eight Hundred Twenty-Nine Million One Hundred Ninety Thousand Two Hundred Seventy
Pesos 55/100) would be funded by HSBC México.

 

Termination of Tranche
B.

 

HSBC Mexico’s obligation
with respect to Tranche B (as such term is defined in the Original Credit Agreement) was terminated as of the Effective Date of
the Amended and Restated Credit Agreement, without prejudice of any fees paid by the Borrower on or about the Drawdown Date for
HSBC’s loan commitment.

 

Interest.

 

(a)         The Borrower shall
pay to each Lender, in respect of each Interest Period and without need for demand, interest on the outstanding principal amount
of the Loans made available by such Lender, at an annual rate equal to the TIIE for the relevant Interest Period plus the
Applicable Margin (the “Interest Rate”).

 

(b)         If the Central Bank
of Mexico shall have temporarily or permanently discontinued the publication of the TIIE, the interest rate applicable in respect
of any Interest Period shall be equal to the annual interest rate for new issues of 28 (twenty-eight) day Treasury Certificates
most recently published by the Central Bank of Mexico in its Internet page prior to the commencement of the relevant Interest Period,
plus the Applicable Margin.

 

(c)         If the Central Bank
of Mexico shall have temporarily or permanently discontinued the publication of both the TIIE and the rate referred to in paragraph
(b) above, the interest rate applicable in respect of any Interest Period shall be equal to the Cost of Peso-Denominated Funds
(Costo de Captación a Plazo de Pasivos Denominados en Pesos) most recently published by the Central Bank of Mexico
in its Internet page prior to the commencement of the relevant Interest Period, plus the Applicable Margin.

 

    	 

    	 

    

 

(d)          If the Central Bank
of Mexico shall have temporarily or permanently discontinued the publication of the TIIE and the rates referred to in paragraphs
(b) and (c) above, the applicable interest rate shall be the interest rate published by the Central Bank of Mexico in lieu of the
interest rate referred to in paragraph (c) above, plus the Applicable Margin.

 

(e)          Any substitute rate
applicable pursuant to paragraphs (b), (c) and (d) above, shall cease to be in effect beginning on the first Interest Period immediately
following the date on which the Central Bank of Mexico resumes publication of the TIIE.

 

(f)          Interest shall be
due and payable on the last Business Day of each Interest Period (each such date, an “Interest Payment Date”); provided,
that the last Interest Payment Date shall occur on the relevant Maturity Date.

 

(g)         Any and all interest
due and payable under the Amended and Restated Credit Agreement shall be calculated based on the number of days actually elapsed
in a year comprised by 360 (three hundred sixty) days, including the first but excluding the last day thereof.

 

Late Interest.

 

(a)         If any amount due
and payable under the Amended and Restated Credit Agreement or the Promissory Notes is not paid when due, such amount shall accrue
late interest from the date on which it became due to the date on which it shall have been paid in full, at an annual rate equal
to the Interest Rate for the relevant period, multiplied by two (2) (the “Late Interest Rate”).

 

(b)         The daily amount
of late interest accrued by any past due amount shall be determined by multiplying such amount by the quotient of dividing the
Late Interest Rate by 360 (three hundred sixty), which late interest shall be due and payable on demand by the Borrower based on
the actual number of days elapsed and for so long as a default shall have occurred and be continuing.

 

Repayment.

 

(a)         The Borrower shall
repay to each Lender the principal outstanding portion of Tranche 1 funded by such Lender in 72 (seventy-two) consecutive monthly
installments, each in an amount equal to the product of multiplying the disbursed amount of Tranche 1 by the percentage set forth
in the schedule as with respect to the relevant Payment Date, beginning on the Payment Date immediately following the Effective
Date of the Amended and Restated Credit Agreement (the last such date, the “Tranche 1 Maturity Date”).

 

(b)         The Borrower shall
repay to each Lender the principal outstanding portion of Tranche 2 funded by such Lender in 84 (eighty-four) consecutive monthly
installments, each in an amount equal to the product of multiplying the disbursed amount of Tranche 2 by the percentage set forth
in the schedule as with respect to the relevant Payment Date, beginning on the Payment Date immediately following the Effective
Date of the Amended and Restated Credit Agreement (the last such date, the “Tranche 2 Maturity Date”).

 

Prepayments of Principal.

 

(a)         The Borrower shall
be entitled to repay the principal amount of the Loans, together with any accrued but unpaid interest thereon and any other amounts
due and payable in connection therewith pursuant to the Amended and Restated Credit Agreement, prior to its scheduled maturity,
upon written notice to each Lender at least 10 (ten) Business Days prior to the proposed date of repayment of such principal.

 

(b)         The principal amount
of the Loans, net of any applicable taxes, shall be subject to prepayment by the Borrower in the event of and with the proceeds
from:

 

(i)         any sale,
assignment or other transfer of assets by GCS or any of its Subsidiaries (including the Co-Obligors), other than (1) any sale of
its inventories in the ordinary course consistent with its past practice and (2) any sale of assets representing, in a single transaction
or a series of successive transactions, in any fiscal year, less than $10,000,000 (ten million Dollars) or its equivalent in any
other currency, provided that the proceeds of such sale are used to purchase new assets within 180 (one hundred eighty) days from
the drawdown date;

 

    	 

    	 

    

 

(i)         the issuance
of any Equity Interest or the issuance or incurrence of any Indebtedness by GCS or its Subsidiaries (including the Co-Obligors),
other than any Indebtedness permitted by paragraph (a) of Article Twelve, for purposes other than the repayment of the Loans;

 

(ii)        the transfer
of any Equity Interest in its Subsidiaries;

 

(iii)       any
amount received by GCS or any of its Subsidiaries (including the Co-Obligors) as adjustment to the purchase price or as indemnification
under the Acquisition Documents;

 

(iv)       any insurance
proceeds received in connection with the occurrence of an insured event, to the extent not used to replace the relevant assets;
and

 

(v)        100% (one
hundred percent) of the Cash Surplus, if the Net Indebtedness/EBITDA Ratio shall be greater than 2.5 to 1, or 50% (fifty-percent)
of the Cash Surplus, if the Net Indebtedness/EBITDA Ratio shall be equal to or lower than 2.5 to 1, which amount shall in either
case be due and payable within 10 (ten) Business Days from the delivery of the quarterly financial information referred to in paragraph
(b) of Article Eleven).

 

(c)          Subject to paragraph
(b) of Article Nine, all prepayments shall be allocated to repay the Loans in inverse order to their maturity. If the prepaid amount
shall be equal to or less than $50,000,000 (fifty million Dollars) or its equivalent in any other currency, 50% (fifty percent)
of such amount shall be allocated to repay Tranche 1 and the remaining 50% (fifty percent) shall be allocated to repay Tranche
2, on a pro rata basis taking into consideration the outstanding amount of the Loans funded by each Lender. If the prepaid amount
shall exceed 50,000,000 (fifty million Dollars) or its equivalent in any other currency, the Borrower shall have the right to determine
the percentage of such amount that shall be allocated to repay the Loans, or to repay Tranche 1 or Tranche 2. If the Net Indebtedness/EBITDA
Ratio shall then be equal to or lower than 2.5 to 1, 30% (thirty percent) of the prepayment shall be allocated to repay Tranche
1 and the remaining 70% (seventy percent) shall be allocated to repay Tranche 2, regardless of the amount of such prepayment, on
a pro rata basis taking into consideration the outstanding amount of the Loans funded by each Lender.

 

(d)         To the extent that
any prepayment is made on a Payment Date, the Borrower shall not be required to pay any fee or penalty to the Lenders. If a prepayment
shall occur on a date other than a Payment Date, the Borrower shall pay to each Lender any and all costs and expenses incurred
by the latter in connection therewith, within 15 (fifteen) days from the receipt of demand therefor from the relevant Lender; provided,
that such Lender shall have delivered to the Borrower a document containing a reasonably detailed breakdown of the calculation
of the relevant charges, which document shall have binding effect absent any calculation error.

 

(e)          If the Borrower
shall have failed to make any prepayment following the delivery of notice thereof to the Lenders, the Borrower shall pay to each
Lender, upon demand, any and all costs and expenses incurred by the latter in connection with such repayment, provided that such
Lender shall have delivered to the Borrower a reasonably detailed description of such cost or expense.

 

Joint and Several
Obligations.

 

(a)          Pursuant to articles
1,987 (one thousand nine hundred eighty-seven), 1,988 (one thousand nine hundred eighty-eight) and other applicable provisions
of the Federal Civil Code (Código Civil Federal), and the corresponding articles of the civil codes for the Federal
District and all states of the Mexican Republic, each Co-Obligor has agreed to be held jointly and severally liable with the Borrower
for the payment, when due, of the principal amount of, interest on, and any fees or other amounts due and payable hereunder and
under the Promissory Notes and the other Loan Documents, irrespective of whether their joint and several obligations are expressly
set forth in the relevant articles of the Amended and Restated Credit Agreement, the Promissory Notes or the other Loan Documents.
Accordingly, the Lenders shall be entitled to demand payment of any such amount, indistinctly, to the Borrower and/or any of the
Co-Obligors, either jointly or individually.

 

(b)         In addition to its
obligations pursuant to the preceding paragraph, each Co-Obligor has agreed to execute, as guarantor, any and all Promissory Notes
issued under the Amended and Restated Credit Agreement.

 

(b)         If any Co-Obligor
shall have paid any amount on behalf of the Borrower, the Borrower and the Co-Obligors have agreed not to seek the recovery of
such amount from the other Co-Obligors unless and until the Lenders shall have received payment of any and all amounts due and
payable thereto pursuant to the Amended and Restated Credit Agreement, the Promissory Notes and the other Loan Documents.

 

    	 

    	 

    

 

Certain Acceleration
Events.

 

(a)         Payment Defaults.
If the Borrower or any Co-Obligor shall have failed to pay when due any principal, interest or other amounts (including any fees)
payable by it pursuant to the Amended and Restated Credit Agreement, the Promissory Notes or any of the other Loan Documents.

 

(b)         Representations
and Information. If any of the representations of the Borrower or any Co-Obligor under the Amended and Restated Credit Agreement,
any of the Loan Documents or any certificate, financial statement or other document provided or delivered under the Amended and
Restated Credit Agreement or any Loan Document, or any information or document provided by the Buyer or any Co-Obligor pursuant
thereto, shall prove incomplete, incorrect, false or misleading in any material respect.

 

(c)         Other Defaults.
If the Borrower or any Co-Obligor shall have defaulted with the performance of its obligations under paragraphs (b)(i), (b)(ii),
(b)(iii) or (b)(iv) of Article Eleven, and such default shall have remained uncured for a period of 30 (thirty) days, under paragraph
(d) thereof, and such default shall have remained uncured for a period of 30 (thirty) days, under paragraph (e) thereof, and such
default shall have remained uncured for a period of 5 (five) days, under paragraph (f) thereof, and such default shall have remained
uncured for a period of 15 (fifteen) days, under paragraph (h) thereof, and such default shall have remained uncured for a period
of 30 (thirty) days, under paragraph (m) thereof, and such default shall have remained uncured for a period of 30 (thirty) days,
or under paragraph (n) thereof, and such default shall have remained uncured for a period of 15 (fifteen) days, or with any of
its other obligations under the Amended and Restated Credit Agreement (other than those referred to in paragraphs (a) or (c) above)
or under the other Loan Documents, and such default shall have remained uncured for a period of 30 (thirty) days, in each such
case from the earlier of (i) the date on which any Authorized Officer of the Borrower acquired knowledge of such default or (ii)
the delivery of a notice of default by any Lender to the Borrower.

 

(d)         Default with
Other Indebtedness. (i) If the Borrower, any of its Subsidiaries or any Co-Obligor shall have defaulted in the performance
of its obligations orin an event of default shall have occurred under any indenture, agreement or credit or other similar instrument
relating to any Indebtedness incurred by any of them (other than the Indebtedness incurred pursuant to the Amended and Restated
Credit Agreement, the Promissory Notes and the other Loan Documents) in an amount equal to or in excess of $5,000,000 (five million
Dollars) or its equivalent in any other currency (based on the prevailing exchange rate for such currency as of the relevant determination
date), which default or event of default could give rise to the acceleration of such Indebtedness, or (ii) if the Borrower, any
of its Subsidiaries or any Co-Obligor shall have failed to pay when due the principal of, interest on, or any other amount payable
by it in connection with any Indebtedness incurred by any of them (other than the Indebtedness incurred pursuant to the Amended
and Restated Credit Agreement, the Promissory Notes and the other Loan Documents).

 

(e)         Defaults with
Authorities. If the Borrower, any of its Subsidiaries or any Co-Obligor shall have defaulted in the performance of any obligation
with any Governmental Authority, including, without limitation, the Ministry of Finance and Public Credit (Secretaría
de Hacienda y Crédito Público), the Internal Revenue System (Sistema de Administración Tributaria),
the Mexican Institute of Social Security (Instituto Mexicano del Seguro Social), the Institute for the National Workers’
Housing Fund (Instituto del Fondo Nacional para la Vivienda de los Trabajadores) or the Retirement Savings System (Sistema
de Ahorro para el Retiro), in an amount exceeding, individually or in the aggregate, $5,000,000 (five million Dollars) or its
equivalent in any other currency (based on the prevailing exchange rate for such currency as of the relevant determination date),
and such default shall have remained uncured for a period of 15 (fifteen) days.

 

(f)         Defaults Under
Other Agreements. If the Borrower, any of its Subsidiaries or any Co-Obligor shall have defaulted or in an event of default
shall have occurred under any payment obligation to its suppliers, in an amount exceeding, individually or in the aggregate, $10,000,000
(ten million Dollars) or its equivalent in any other currency (based on the prevailing exchange rate for such currency as of the
relevant determination date), whether in a single occurrence or during any given year.

 

(g)        Authorizations.
If any governmental or other license, consent, registration, concession, permit or authorization necessary for the Borrower, any
of its Subsidiaries or any Co-Obligor to conduct its business as conducted as of the date of the Amended and Restated Credit Agreement,
or for the execution and performance by it or the validity or enforceability of the Amended and Restated Credit Agreement, the
Promissory Notes or any of the other Loan Documents, shall have not been obtained or maintained, shall have been revoked or amended,
or shall have ceased to be valid.

 

    	 

    	 

    

 

(h)         Insolvency.
(i) If the Borrower, any of its Subsidiaries or any Co-Obligor shall have filed for or entered reorganization (concurso mercantil),
insolvency, bankruptcy or debtor relief proceedings seeking (A) to be adjudicated under reorganization, bankrupt, insolvent, under
dissolution or liquidation, or subject to court relief as with respect of itself or its debts, under any present or future law
of any country (whether in Mexico or abroad), or (B) the appointment of a receiver, mediator, intervenor, visitator, custodian,
administrator, conservator or other similar officer, in respect of all or a substantial portion of its assets, or shall have made
a general assignment for the benefit of its creditors; (ii) if any of the actions or proceedings referred to in (i) above shall
have been commenced against the Borrower, any of its Subsidiaries or any Co-Obligor, and such action or proceeding (A) shall have
resulted in the issuance of a court relief, reorganization (concurso mercantil), insolvency or other similar order, or in
the appointment of an officer responsible of performing any duties associated with such court relief or insolvency, and (B) such
action or proceeding shall have remained undismissed or unstayed for a period of 60 (sixty) days; or (iii) if any action or proceeding
seeking the issuance of an order of attachment, execution or other similar process in respect of all or a substantial portion of
its assets, shall have resulted in the issuance of any such order, and such order shall have remained undismissed or unstayed for
a period of 60 (sixty) days from its date of issue; or (iv) if the Borrower, any of its Subsidiaries or any Co-Obligor shall be
generally unable or shall have acknowledged in writing its general inability to pay its debts upon their maturity; or (v) if any
decision as with respect to the dissolution or liquidation of the Borrower any of its Subsidiaries or any Co-Obligor, shall have
been issued.

 

(i)          Court Decisions.
If any court shall have issued against the Borrower, any of its Subsidiaries or any Co-Obligor, a final, non-appealable decision
requiring it to pay an amount of money in excess, whether individually or in the aggregate, of $10,000,000 (ten million Dollars)
or its equivalent in any other currency (based on the prevailing exchange rate for such currency as of the relevant determination
date), and such decision shall have remained unstayed or unsatisfied for a period of 60 (sixty) days from its date of issue, except
where its obligations thereunder have been adequately secured or the enforcement of such order has been stayed or is being contested
by it through the appropriate proceedings available to it under the applicable laws, and where it has created adequate reserves
in respect thereof in accordance with the Financial Reporting Standards.

 

(j)          Validity of the
Amended and Restated Credit Agreement and the Loan Documents. (i) If the Borrower, any of its Subsidiaries or any Co-Obligor
shall have challenged the validity or enforceability of any Loan Document or (ii) if any judicial, arbitration or administrative
proceedings challenging the validity or enforceability of any Loan Document shall have been commenced.

 

(k)         Material Adverse
Effect. If there shall have occurred any circumstance, event or condition which could have a material and adverse effect on
(a) the activities, condition (financial or otherwise), business operations, property or prospects of the Borrower, any of its
Subsidiaries or any Co-Obligor, whether individually or taken as a whole, or (b) the validity or enforceability of any Loan Document
or the rights of any Lender thereunder, or the ability of the Borrower or any of the Co-Obligors to satisfy its obligations under
the Amended and Restated Credit Agreement, the Promissory Notes or the other Loan Documents (each, a “Material Adverse
Effect”).

 

(l)          Collateral.
If any security interest on the property and rights subject matter of the Collateral Documents shall have ceased to be in full
force and effect or to constitute a duly perfected, first priority guaranty in favor of the Mexican Collateral Agent, the Chilean
Collateral Agent or the Lenders, as with respect to any other creditor of the Borrower, the Co-Obligors or the parties who provided
the relevant guaranty.

 

(m)        Expropriation.
If any Governmental Authority shall have nationalized, seized, assumed the control of or otherwise expropriated all or a substantial
portion of the property of or any shares of stock issued or held by the Borrower, any of its Subsidiaries or any Co-Obligor, or
shall have taken any action (including any of the aforementioned actions) which prevents the Borrower or any Co-Obligor from performing
its obligations under the Amended and Restated Credit Agreement, the Promissory Notes or the other Loan Documents, other than the
nationalization, seizure, assumption of control or expropriation of any property with a market value of less than $10,000,000
(ten million Dollars) or its equivalent in any other currency (based on the prevailing exchange rate for such currency as of the
relevant determination date).

 

(n)         Change in Control.
If a Change in Control shall have occurred.

 

    	 

    	 

    

 

Legality; Increased
Costs.

 

(a)         If as a result of
the amendment of any law, regulation, rule or other provision applicable to any Lender or office thereof responsible for managing
and funding the Loans, or of any change in the interpretation of any of the above by any competent court or Governmental Authority,
in each case subsequent to the date of execution of the Amended and Restated Credit Agreement, it shall become illegal for such
Lender to make or maintain in effect the Loans, the Borrower, upon request of such Lender, shall immediately and without being
subject to any penalty prepay to such Lender, directly, the outstanding amount of its Loans, together with any and all interest
accrued thereby, any other amount payable in connection therewith, and the amount of any additional costs or expenses incurred
by such Lender as a result of such prepayment.

 

(b)         If as a result of
the amendment of any law, regulation, rule or other provision applicable to any Lender or office thereof responsible for managing
and funding the Loans (including, without limitation, as with respect to any capitalization, reserves or deposit requirement, ordinary
or extraordinary contribution (payable to a Governmental Authority), taxes or other conditions applicable to such Lender, but excluding
any provision as with respect to the income taxes or other similar taxes payable by such Lender (or by its successors, participants
or assignees pursuant to Article Sixteen of the Amended and Restated Credit Agreement) based on its total income or assets pursuant
to the laws, regulations and other provisions applicable to such Lender), or of any change in the interpretation of any of the
above by any competent court or Governmental Authority, in each case subsequent to the date of execution of the Amended and Restated
Credit Agreement, the cost for such Lender of making or maintaining in effect the Loans shall have increased, or the amounts received
or receivable by such Lender shall have decreased, the Borrower, upon request of such Lender, shall pay thereto, on the last day
of the then current Interest Period or the date occurring 10 (ten) Business Days from the Lender’s request, whichever occurs
later, any and all such reasonable and properly documented amounts as may be necessary to compensate such Lender for such cost
increase or revenue decrease. The Lender’s request shall include a description of the reasons of such increased costs or
reduced income, and all relevant calculations; provided, that absent any calculation error the determination made by such Lender
shall be conclusive and binding upon the Borrower.

 

(c)         The Lenders have
agreed to make reasonable efforts to avoid incurring in any of the legal violations, cost increases or revenue decreases referred
to hereinabove, including, exclusively and to the extent practicable, by reassigning the administration of the Loans to a different
office; provided that such reassignment does not involve a material cost for the relevant Lender.

 

Agency; Mexican Collateral
Agent and Chilean Collateral Agent.

 

(A)        Mexican Collateral
Agent.

 

The Lenders have confirmed
the mandate granted to HSBC México, S.A., Institución de Banca Múltiple, Grupo Financiero HSBC, Trust Division,
under the original Credit Agreement, to serve as Mexican Collateral Agent on behalf of the Lenders pursuant to Title Three, Chapter
One of the Commerce Code (Código de Comercio), and to carry out in such capacity, through its legal representatives,
any and all acts relating to the Collateral Documents in accordance with the terms set forth in the Amended and Restated Credit
Agreement and the Collateral Documents, in Mexico and any other jurisdiction; and HSBC México, S.A., Institución
de Banca Múltiple, Grupo Financiero HSBC, Trust Division, has confirmed its acceptance of such mandate.

 

(B)         Chilean Collateral
Agent.

 

The Lenders have confirmed
and, in the event of assignment of the Amended and Restated Credit Agreement in accordance with the terms thereof, the assignor
and any assignee, shall be deemed to have confirmed the commercial mandate granted to HSBC Bank (Chile) to serve as “Chilean
Collateral Agent” pursuant to Article 18 of Chile’s Law No. 20.190, enacted June 5, 2007, the provisions relating
to such type of mandates contained in Chile’s Commerce Code (Código de Comercio) and Civil Code (Código
Civil), and the provisions of the original Credit Agreement, and in such capacity to represent them in connection with the
creation, amendment or termination of the Chilean Pledge Agreements, exercise their rights under the Chilean Pledge Agreements
and, absent any specific provision in the Amended and Restated Credit Agreement, to proceed in accordance with the express, written
instructions of the Lenders. Notwithstanding the above, the Chilean Collateral Agent shall not be precluded for any reason whatsoever
from being a Lender under the Amended and Restated Credit Agreement, and shall be entitled to act as any other Lender.

 

Governing Law.

 

The Amended and Restated
Credit Agreement is governed by the laws of Mexico.

 

    	 

    	 

    

 

Jurisdiction.

 

For purposes of the interpretation
and enforcement of the Amended and Restated Credit Agreement, the parties have submitted to the jurisdiction of the competent courts
in Mexico City, Federal District, and have waived any other jurisdiction to which they may be entitled

 

Special Waiver.

 

To the extent applicable,
the parties have irrevocably waived their right to file action to rebalance their obligations under the Amended and Restated Credit
Agreement and the Loan Documents pursuant to articles 1,796 and 1,796-Bis of the Civil Code for the Federal District and the corresponding
articles of the civil codes for all the states of Mexico.Exhibit 4.3

 

SUMMARY OF THE IRREVOCABLE GUARANTY TRUST
AGREEMENT NO. F/00756

 

On September 28, 2010,
Grupo Casa Saba, S.A.B. de C.V. (“Grupo Casa Saba”), Casa Saba, S.A. de C.V., Inmuebles Visosil, S.A. de C.V.,
Distribuidora Citem, S.A. de C.V. and Transportes Marproa, S.A. de C.V., as settlors (each a “Settlor” and,
collectively, the “Settlors” and/or “Second Beneficiaries”); Última del Golfo, S.A.
de C.V., Capa, S.A. de C.V., Alta del Centro, S.A. de C.V., Solo, S.A. de C.V., Estrella del Pacífico, S.A. de C.V., Medicamentos
Doctorgen, S.A. de C.V., Inmuebles Visosil, S.A. de C.V., Drogueros, S.A. de C.V., Daltem Provee Nacional, S.A. de C.V., Casa Saba,
S.A. de C.V., Farmacias ABC, S.A. de C.V., Publicaciones Citem, S.A. de C.V., Daltem Provee Norte, S.A. de C.V., Centennial, S.A.
de C.V. and Controladora Casa Saba, S.A. de C.V., as issuers (each an “Issuer” and, collectively, the “Issuers”);
The Bank of New York Mellon, S.A., Institución de Banca Múltiple (the “Trustee”); and HSBC México,
S.A., Institución de Banca Múltiple, Grupo Financiero HSBC, División Fiduciaria (together with its successors,
beneficiaries and assigns, the “Beneficiary”), acting both in its own name and in its capacity as Mexican Collateral
Agent in the name, on behalf and for the benefit of the Lenders; entered into irrevocable guaranty trust agreement No. F/00756
(the “Agreement”).

 

Upon establishment of such
irrevocable guaranty trust with the Trustee, each Settlor transferred thereto all of its rights and title to the Initial Shares
as security for (i) the payment when due of the principal amount and any interests thereon or other amounts payable by it under
the Credit Agreement, the Promissory Notes and other related documents, (ii) the satisfaction of its obligations under the Agreement,
and (iii) the payment of any and all fees, costs and expenses incurred by the Beneficiary in connection with the execution of this
Agreement, the transfer of any property to the trust, and the enforcement thereof (all such obligations, collectively, the “Secured
Obligations”). The Initial Shares, duly endorsed in favor of the Trustee and the execution of this Agreement and a receipt,
constitute evidence of the receipt of the Initial Shares by the Trustee.

 

The Settlors or any third
parties controlled by Grupo Casa Saba shall transfer to the Trustee any additional shares acquired by them (the “Additional
Shares”), within five (5) Business Days from their acquisition or issuance. In order to comply with the provisions contained
in the General Corporations Law (Ley General de Sociedades Mercantiles), one (1) such share may remain outside of the trust.

 

The transfer of title to
the Initial Shares to the Trustee entailed:

 

(1)          (i) the
delivery thereto of the stock certificates representing the Initial Shares, duly endorsed in its favor, and (ii) the recordation
of such transfer in the stock registry of the relevant Issuer, by the Secretary of the Board of Directors thereof, including a
notation to the effect that the Initial Shares were contributed to the trust, together with a Secretary’s Certificate as
with respect to such recordation, including a copy of the relevant entry; and

 

(2)          the subsequent
delivery thereto of any Additional Shares acquired by the Settlors or any third party controlled by Grupo Casa Saba, and the performance
of the other acts referred to in the preceding paragraph.

 

The Trustee received the
certificates representing the Initial Shares and agreed to hold them in trust as part of the trust estate (the “Trust
Estate”), as security for the satisfaction of the Secured Obligations, and to revert all rights and title thereto to
the Settlors on the Expiration Date. The party contributing the Initial Shares and any Additional Shares shall be liable for (i)
any defect in such title and (ii) any hidden defects.

 

For purposes of the applicable
tax laws, the Settlors and Second Beneficiaries have reserved themselves the right to obtain the reversion of their title to the
Initial Shares and any Additional Shares on the Expiration Date.

 

The Trust Estate is comprised
by:

 

(1)          the Initial
Shares transferred to the Trustee;

 

(2)          any Additional
Shares or other property contributed to the trust;

 

(3)          any additional
rights in respect of the Initial Shares, the Additional Shares and any other property contributed to the trust;

 

(4)          any dividends
or other distributions, excluding those payable to the Settlors;

 

    	 

    	 

    

 

(5)          any instruments
or securities purchased out of the Trust Estate, and any return yielded thereby;

 

(6)          any certificates
or instruments contributed to the trust in lieu of the Initial Shares or the Additional Shares;

 

(7)          the rights
conferred by the Initial Shares, any Additional Shares and any other item of property contributed to the trust;

 

(8)          any other
item of property contributed to the Trust Estate.

 

Until such time as an Execution
Event shall have occurred, the Settlors shall retain the voting and dividend rights conferred by the Initial Shares and any Additional
Shares, subject to the following:

 

(1)          The Settlors
shall be entitled to (i) instruct the Trustee as with respect to the manner in which the Trustee must vote the Initial Shares and
any Additional Shares, or as with respect to the execution of any resolutions in lieu of a shareholders’ meeting, and (ii)
cause the Trustee to issue proxy letters for purposes of the exercise of the voting rights pertaining to the Initial Shares and
any Additional Shares, except if an Execution Event shall have occurred, in which case such rights shall be exercised by the Trustee
in accordance with the instructions provided to it by the Beneficiary.

 

a.          The Trustee,
in its capacity as holder of the Initial Shares and any Additional Shares, shall exercise any and all rights of first refusal to
subscribe any newly issued shares, so long as it shall have received from the Settlors (i) written instructions to such effect,
at least three (3) Business Days prior to the expiration of the period for the exercise of such rights, and (ii) the requisite
funds, at least two (2) Business Days in advance.

 

(2)          The Settlors
shall be entitled to receive from the Trustee any cash dividends or distributions paid by the Issuer of the Initial Shares or any
Additional Shares, unless an Execution Event shall have occurred, in which case any such amount shall become part of the Trust
Estate.

 

Any and all in-kind dividends
or distributions paid in respect of the Initial Shares and any Additional Shares shall become part of the Trust Estate.

 

Except as otherwise authorized
in writing by the Beneficiary, the Settlor shall be required to:

 

(1)          give to
the Beneficiary and the Trustee notice of any circumstance that could affect the Trust Estate;

 

(2)          execute
and deliver any and all such documents as may be necessary to effect and protect the transfer of title to any item of property,
so as to enable the Trustee and the Beneficiary to exercise their respective rights in connection therewith;

 

(3)          refrain
from creating or suffering the existence of any lien on the Trust Estate;

 

(4)          refrain
from taking or allowing any person controlled by it to take any action that could affect the validity or enforceability of this
Agreement or the Credit Agreement;

 

(5)          transfer
to the Trustee any Additional Shares acquired by them; and

 

(6)          defend,
at its own cost and expense, the Trust Estate and the rights of the Beneficiary, the Secured Parties and the Trustee.

 

Pursuant to Article 83
of the Law of Credit Institutions (Ley de Instituciones de Crédito) and Article 403 of the LGTOC, following the occurrence
of an Execution Event the Beneficiary shall be entitled to instruct the Trustee to commence extrajudicial proceedings to sell the
Trust Estate in accordance with the following:

 

(1)          Upon receipt
of any such instruction (the “Sale Instructions”) from the Beneficiary, the Trustee shall give notice and forward
a copy thereof to a representative of the Settlors, substantially in the form of Exhibit C, and shall commence the process to sell
the Trust Estate in order to pay the Secured Obligations as a result of the occurrence of an Execution Event. The Sale Instructions
shall include a copy of the Agreement, certified by a notary public, a description of the Execution Event, the amount owed to the
Beneficiary and the latter’s determination to the effect that the Settlors have incurred in default with their obligations.

 

    	 

    	 

    

 

(2)          The Trustee
shall give written notice of its receipt of the Sale Instructions to the Settlors’ representative either in accordance with
the instructions provided to it to such effect by the Beneficiary or its representatives, or in person through a notary public,
during Business Days and business hours, within three (3) Business Days from its receipt of the Sale Instructions.

 

(3)          The Settlors
shall have the right to object to such sale within three (3) Business Days from the receipt of written notice thereof from the
Trustee.

 

(4)          The Settlors
shall only be entitled to object to such sale upon delivery to the Trustee of an original payment receipt or waiver of the Beneficiary’s
execution rights (as a result of the cure of the relevant Execution Event), issued and executed by the Beneficiary; provided,
that the Trustee shall be entitled to request from the Beneficiary written confirmation of the actual satisfaction of the relevant
obligations.

 

(5)          If the
Settlors do not provide evidence of the satisfaction of their obligations under the Credit Agreement, the Promissory Notes or any
other related document, or of the Beneficiary’s waiver of its right to demand such sale, or if they do not provide any such
evidence in the terms set forth in the Agreement, the Trustee shall proceed with the sale of the Trust Estate in accordance with
the written instructions of the Beneficiary.

 

(6)          The Beneficiary
may, upon written notice to the Trustee, suspend the process for the sale of the Trust Estate, or decide to move forward with it.

 

(7)          The Trustee
shall sell the Trust Estate at a public auction held at the site of its choice, with the Advisor’s assistance. The Trustee,
with the assistance of the Advisor (as such term is defined hereinbelow), shall investigate each potential bidder and request its
cooperation in connection with the bidding process. The Advisor, based upon the Beneficiary’s instructions, shall prepare
and distribute, or cause a third party to prepare and distribute, at the Settlors’ cost and expense, a confidential information
memorandum (the “Information Memorandum”) for its delivery to the prospective bidders. The Information Memorandum
shall include, among other things, a description of the business of the Issuers, an analysis of their financial statements and
results of operations (including the audited financial statements of each such Issuer for the previous three (3) fiscal years),
and the confidentiality obligations of the prospective bidders as with respect to the information provided to them. The Information
Memorandum shall set forth the amount required to be posted by the prospective bidders in the form of a deposit certificate or
a certified check issued in the Trustee’s name, in order to guaranty the seriousness of their bids.

 

(8)          At the
request of the Beneficiary or the Advisor, the Settlors and the Issuers shall prepare and deliver to the Trustee, the Beneficiary
and the Advisor, any and all such information as with respect to the Issuers as the Beneficiary or the Advisor may deem necessary
for purposes of the preparation of the Information Memorandum or for the purposes of the Agreement, and any and all such documents
as in the Beneficiary’s or the Advisor’s opinion may be required by a prospective bidders as a basis for the submission
of an informed bid; provided, that the Information Memorandum shall state that neither the Trustee nor the Beneficiary or
the Advisor shall be liable for any information contained therein as with respect to the Issuers.

 

(9)          Following
the distribution of the Information Memorandum to the prospective bidders by the Trustee, the Trustee shall notify to such prospective
bidders the place, date and time for the auction (the “Notice of Auction”); provided, that such date
may not occur later than 30 (thirty) days from the date of distribution of the Information Memorandum and any other information
to all of the prospective bidders, or later than 45 (forty-five) days from the delivery of the Information Memorandum and any other
information to the first prospective bidder.

 

    	 

    	 

    

 

(10)        The bidders
shall deliver their bids to the Trustee in writing, in a closed envelope, together with a deposit certificate issued by a banking
institution, or a certified check in the Trustee’s name, in the amount requested by the Trustee as guaranty of the seriousness
of their bids.

 

(11)        The Trustee
shall open the envelopes in the presence of a notary public and the bidders or their representatives, on the date and at the time
set for the auction and, if so requested by the Beneficiary, shall consummate the sale of the Trust Estate to the highest bidder
within 10 (ten) Business Days as of such date (or if its consummation within such period were not practicable for any reason, then
within a longer period).

 

(12)        The winning
bidder shall be required to pay to the Trustee the purchase price offered by it, within the Business-Day period set forth by the
Trustee based on the Beneficiary’s instructions.

 

(13)        In the
event of the winning bidder’s failure to pay such purchase price within the period set forth to such effect, the deposit
or certified check delivered by such bidder shall become the property of the Beneficiary and shall be applied by it to the outstanding
amount of the Secured Obligations, in accordance with the Agreement.

 

(14)        If the
purchase price shall have remained unpaid upon expiration of the relevant payment period, the Trustee, within the next 20 (twenty)
Business Days, shall give written notice of such circumstance to the bidder who submitted the second highest bid and, upon ratification
of its bid by such bidder and at the Beneficiary’s request, the Trustee shall allow such bidder a period of time to pay the
purchase price. If such bidder does not ratify its original bid, the Trustee may continue to contact the bidder who submitted the
next best offer, subject to the procedure described hereinabove, unless the Beneficiary shall object to it.

 

(15)        If the
Trustee were unable to complete the sale, it shall, subject to the Beneficiary’s consent, hold a new action in accordance
with the above procedure until it shall have sold the Trust Estate.

 

The amount belonging to
the Trust Estate shall be delivered to the Trustee and shall be allocated by it in accordance with the Beneficiary’s instructions;
provided, that in any event it must be allocated in the following order:

 

(1)          to pay any and all
taxes due and payable by the Settlors in connection with the sale of the Trust Estate;

 

(2)          to pay any and all
of the fees and expenses incurred in connection with the sale of the Trust Estate;

 

(3)          to pay the fees
of the Trustee;

 

(4)          to pay any and all
the Secured Obligations remaining unsatisfied, to which effect it shall deliver to the Beneficiary any and all amounts as the latter
may request for purposes of their allocation in accordance with the Credit Agreement; and

 

(5)          the balance remaining
after the payment of each and all of the amounts set forth hereinabove, if any, shall be delivered to the Settlors in accordance
with the instructions provided by them or, absent such instructions, shall be allocated as a competent court may determine.

 

Subject to the receipt
of instructions to such effect from the Beneficiary, the Trustee shall appoint a third party, a banking institution or a financial
advisor (the “Advisor”) to coordinate the bidding process and prepare all the requisite documentation; provided,
that (i) the Beneficiary shall be entitled to replace the Advisor with or without cause, and (ii) no employment relationship
shall exist at any time between the Advisor and the Trustee or the Beneficiary.

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