Non-chloroflurocarbon aerosol formulations

Abstract: An aerosol formulation for administration of medicament has 1,1,1,2-tetrafluoroethane as propellant and an excipient which is a propylene glycol diester of a C₆-C₁₂ fatty acid or a triglyceride ester of a C₆-C₁₂ fatty acid.

Description: INTRODUCTION TO THE INVENTION The present invention is directed at aerosol formulations which are substantially free of chlorofluorocarbons (CFC's). More specifically, the present invention is directed at formulations substantially free of CFC's and having particular utility in medicinal applications, especially in metered dose pressurized inhalators (MDI's). Metered dose inhalators have proven to be an effective method for delivering medicaments orally and nasally. They have been used extensively for delivering bronchodilating and steroidal compounds to asthmatics and may also be useful for delivering other compounds such as pentamidine and non-bronchodilator anti-inflammatory drugs. The rapid onset of activity of compounds administered in this manner and the absence of any significant side effects have resulted in a large number of compounds being formulated for administration via this route. Typically, the drug is delivered to the patient by a propellant system generally comprising one or more propellants which have the appropriate vapor pressure and which are suitable for oral or nasal administration. The more preferred propellant systems typically comprise propellant 11, propellant 12, propellant 114 or mixtures thereof. Often the vapor pressure of the propellant systems is adjusted by admixing a liquid excipient with the propellant. However, propellants 11, 12 and 114 belong to a class of compounds known as chlorofluorocarbons, which have been linked to the depletion of ozone in the atmosphere. It has been postulated that ozone blocks certain harmful UV rays and that a decrease in the atmospheric ozone content will result in an increase in the incidence of skin cancer. In the 1970's certain steps were taken to reduce the CFC emissions from aerosols. Other propellants, such as hydrocarbons, were used, or the product was delivered in a different manner. Because CFC usage in medicinal applications is relatively low i.e. less than 1% of total CFC emissions, and because of the health benefits associated with metered dose inhalators, steps were not taken at that time to restrict the use of CFC propellants in metered dose inhalators. However, continuing and more sophisticated ozone measurements have indicated that the earlier restrictions in CFC usage were insufficient and that additional, significant steps should be taken to drastically reduce CFC emissions. Recently, recommendations have been made that CFC production be virtually discontinued by the end of this century. As a result, it may not be possible to continue to use CFC propellants in the intermediate and long term. While some efforts have been made to use non-pressurized metered dose inhalators, many of these devices have not been completely successful. Many do not deliver uniform doses, are mechanically complex, do not provide the 100-200 doses per unit of current aerosol containers, are difficult for individuals to utilize, are bulky and/or cumbersome for the patients to use, particularly when they have an acute need for the medication. As a result, there is a need for aerosol formulations substantially free of CFC's. Non-CFC propellants must meet several criteria for pressurized metered dose inhalators. They must be non-toxic, stable and non-reactive with the medicament and the other major components in the valve/actuator. One propellant which has been found to be suitable is CF 3 -CH 2 F, also known as Freon 134a, HFA 134a, HFC 134a or 1,1,1,2 tetrafluoroethane. However, the physical properties, i.e. vapor pressure, polarity, solubility, density and viscosity of HFC 134a differ from those of commonly used propellants. Propellant HFC 134a has a vapor pressure of 5.84 x 10 5 newton/meter 2 absolute (84.7 psia), which is too high for use in metered dose inhalators. In addition, commonly used surfactants may be insoluble in HFC 134a. Moreover, where the medicament is to be delivered as a solution, the medicament may not be readily soluble in this propellant. The density and polarity difference between HFC 134a and the previously used CFC propellant may result in a different delivery of the medicament when HFC 134a replaces a CFC propellant. The medicament may cream, settle or agglomerate in the non-CFC propellant even though this did not occur in the CFC propellant. The use of HFA 134a previously has been disclosed for use in medicinal inhalators. European Patent Publication No. 0 372 777 is directed at medicinal aerosol formulations incorporating Freon 134a and an adjuvant having a higher polarity than the propellant. This publication lists several possible adjuvants and surfactants for use in combination with the propellant and the medicament. International patent application No. WO 91/04011 discloses the combination of 1,1,1,2 tetrafluoroethane and a powdered medicament pre-coated with a non-perfluorinated surfactant prior to dispersing the powdered medicament in the propellant. Pages 6-7 of the publication list suitable surfactants for use with the propellant. A perfluorinated adjuvant optionally could be added. However, the pre-coating of the medicament may not be advantageous, since it adds an additional, complex step to the manufacturing process. Research Disclosure No. 30161, May 1989 discloses that non-CFC propellants such as fluorohydrocarbons may be used in pressurized medicaments delivered directly to the lungs e.g. bronchodilators. U.S. Patent No. 4,174,295 discloses the combination of HFC 134a with various chlorofluorocarbons and optionally a saturated hydrocarbon. U.S. Patent No. 2,885,427 discloses the use of HFC-134a as an aerosol propellant. U.S. Patent No. 3,261,748 discloses the use of HFC-134a for anesthesia. U.S. Patent Nos. 4,129,603, 4,311,863, 4,851,595 and European Publication No. 379,793 also disclose the use of HFC-134a as an aerosol propellant. However, the specific combinations noted above may not provide the desired solubility, stability, low toxicity, exact dosage, correct particle size (if suspension) and/or compatibility with commonly used valves assemblies of metered dose inhalers. SUMMARY OF THE INVENTION The present invention is directed at non-toxic formulations substantially free of CFC's, having improved stability and compatibility with the medicament and valve components and which are relatively easily manufactured. The present invention also is directed at formulations which may be utilized in present aerosol filling equipment with only relatively minor modifications and without pre-coating the medicament. The invention includes an aerosol formulation comprising: A. an effective amount of medicament; and B. 1,1,1,2 tetrafluoroethane. The formulation further comprises an excipient selected from the group consisting of: propylene glycol diesters of medium chain fatty acids; and triglyceride esters of medium chain fatty acids. The formulation optionally may further comprise a surfactant. The surfactant preferably is selected from the group consisting of: oleic acid; sorbitan trioleate; cetyl pyridinium chloride; soya lecithin; polyoxyethylene(20) sorbitan monolaurate; polyoxyethylene(20) sorbitan monostearate; polyoxyethylene(20) sorbitan monooleate; polyoxypropylene-polyoxyethylene block copolymers; polyoxyethylene (10) stearyl ether; polyoxyethylene (2) oleyl ether; polyoxypropylene-polyoxyethylene-ethylenediamine block copolymers; castor oil ethoxylate; and combinations thereof. The preferred liquid excipients are propylene glycol diesters of medium chain fatty acids. The preferred surfactants are oleic acid; sorbitan trioleate, cetylpyridinium chloride; polyoxyethylene (20) sorbitan monolaurate; polyoxypropylene-polyoxyethylene block copolymers; soya lecithin; and polyoxypropylene-polyoxyethylene-ethylenediamine block copolymers; with oleic acid being particularly preferred. The invention is of particular utility where the medicament is albuterol, mometasone furoate or beclomethasone dipropionate, and salts and clathrates thereof. A formulation range comprises: A. 1,1,1,2 tetrafluoroethane 25 - 99.99 wt % B. medicament 0.01 - 1 wt % C. excipient up to 75 wt % D. surfactant (if present) 0 - 3 wt % The present invention also is directed at a method of treating asthma in mammals comprising administering to a mammal in need of such treatment an effective amount of aerosol formulation comprising: A. a medicament selected from the group comprising albuterol, mometasone furoate, beclomethasone dipropionate, and salts and clathrates thereof; B. 1,1,1,2 tetrafluoroethane; and C. an excipient, selected from the group consisting of: propylene glycol diesters of medium chain fatty acids; and triglyceride esters of medium chain fatty acids. A surfactant optionally is present. The surfactant preferably is selected from the group consisting of: oleic acid; sorbitan trioleate; cetyl pyridinium chloride; soya lecithin; polyoxyethylene (20) sorbitan monolaurate; polyoxyethylene (20) sorbitan monostearate; polyoxypropylene-polyoxyethylene block copolymers; polyoxyethylene (10) stearyl ether polyoxyethylene (2) oleyl ether polyoxyethylene-polyoxypropylene-ethylene diamine block copolymers castor oil ethoxylate; and combinations thereof. DETAILED DESCRIPTION OF THE INVENTION The formulations of the present invention all utilize propellant 134a in combination with the medicament, optionally a liquid excipient and optionally a surfactant. The excipient facilitates the compatibility of the medicament with the propellant and also lowers the discharge pressure to an acceptable range i.e. about 2.76 - 5.52 x 10 5 newton/meter 2 absolute (40 to 80 psia), preferably 3.45 - 4.83 x 10 5 newton/meter 2 absolute (50 to 70 psia). The excipient chosen must be non-reactive with the medicament, relatively non-toxic, and should have a vapor pressure below about 3.45 x 10 5 newton/meter 2 absolute (50 psia). As used hereinafter the term "medium chain fatty acids" refers to chains of alkyl groups terminating in a -COOH group and having 6-12 carbon atoms, preferably 8-10 carbon atoms. The term "short chain fatty acids" refers to chains of alkyl groups terminating in a -COOH group group and having 4-8 carbon atoms. The term "alcohol" includes C 1 -C 3 alcohols, such as methanol, ethanol and isopropanol. Among the preferred excipients are: propylene glycol diesters of medium chain fatty acids available under the tradename Miglyol 840 (from Hüls America, Inc. Piscataway, N.J.); and triglyceride esters of medium chain fatty acids available under the tradename Miglyol 812 (from Hüls). A surfactant optionally may be added to lower the surface and interfacial tension between the medicament and the propellant. Where the medicament, propellant and excipient are to form a suspension, a surfactant may or may not be required. Where the medicament, propellant and excipient are to form a solution, a surfactant may or may not be necessary, depending in part on the solubility of the particular medicament and excipient. The surfactant may be any suitable, non-toxic compound which is non-reactive with the medicament and which substantially reduces the surface tension between the medicament, the excipient and the propellant and/or acts as a valve lubricant. Among the preferred surfactants are: oleic acid available under the tradename oleic acid NF6321 (from Henkel Corp. Emery Group, Cincinnati, Ohio); cetylpyridinium chloride (from Arrow Chemical, Inc. Westwood, N.J.); soya lecithin available under the tradename Epikuron 200 (from Lucas Meyer Decatur, Illinois); polyoxyethylene (10) stearyl ether available under the tradename Briji 76 (from ICI); polyoxyethylene (2) oleyl ether available under the tradename Brij 92 (from ICI); polyoxyethylene-polypropylene-ethylenediamine block copolymer available under the tradename Tetronic 150 R1 (from BASF); polyoxyethylene(20) sorbitan monolaurate available under the tradename Tween 20 (from ICI Specialty Chemicals, Wilmington, Delaware); polyoxyethylene(20) sorbitan monostearate available under the tradename Tween 60 (from ICI); polyoxyethylene(20) sorbitan monooleate available under the tradename Tween 80 (from ICI); polyoxypropylene-polyoxyethylene block copolymers available under the tradenames Pluronic L-92, Pluronic L-121 and Pluronic F 68 (from BASF); castor oil ethoxylate available under the tradename Alkasurf CO-40 (from Rhone-Poulenc Mississauga Ontario,Canada); and mixtures thereof. The medicaments of the present invention may include any pharmaceutically active compounds which are to be delivered by oral inhalation or nasally. Typical classes of compounds include bronchodilators, anti-inflammatory compounds, antihistamines, antiallergics, analgesics, antitussives, anti-anginal medications, steroids, corticosteroids, vasoconstrictors and antibiotics. Specific compounds within these classes of compounds are albuterol, mometasone furoate, beclomethasone dipropionate, isoproterenol, heparin, terbutaline, rimiterol, perbuterol, disodium cromoglycate, isoprenaline, adrenaline, pentamidine and ipratropium bromide. These compounds may be utilized either as the free base, as a salt, or as a clathrate depending upon the stability and solubility of the active compound in the specific formulation. Where clathrates are utilized, P-11 and hexane clathrates are particularly preferred. Where the active compound forms a suspension, the particle size should be relatively uniform, with substantially all the particles preferably ranging between about 0.1-25 microns, preferably 0.5-10 microns, more preferably 1-5 microns. Particles larger than 25 microns may be held up in the oropharyngeal cavity, while particles smaller than about 0.5 micron preferably are not utilized, since they would be more likely to be exhaled and, therefore, not reach the lungs of the patient. The formulations of the present invention may be filled into the aerosol containers using conventional filling equipment. Since propellant 134a may not be compatible with all elastomeric compounds currently utilized in present aerosol valve assemblies, it may be necessary to substitute other materials, such as white buna rubber, or to utilize excipients and optionally surfactants which mitigate the adverse effects of propellant 134a on the valve components. One may optionally use an actuator device with a spacer to reduce force of the spray from an MDI. To assure uniform dispersion of the active ingredient, the formulations typically will include the following components: Range (wt %) Preferred Range (wt%) Most Preferred Range (wt%) Medicament 0.01 - 1 0.03 - 0.7 0.05 - 0.5 Propellant 25 - 99.99 50 - 99.97 50 - 99.95 Excipient(s) up to 75 up to 50 up to 50 Surfactant(s) 0 - 3 0 - 2 0 - 1 Depending on the particular application, the container may be charged with a predetermined quantity of formulation for single or multiple dosing. Typically, the container is sized for multiple-dosing, and, therefore, it is very important that the formulation delivered is substantially uniform for each dosing. For example, where the formulation is for bronchodilation, the container typically is charged with a sufficient quantity of the formulation for 200 charges. Suitable suspensions may be screened in part by observing several physical properties of the formulation, i.e. the rate of particle agglomeration, the size of the agglomerates and the rate of particulate creaming/settling and comparing these to an acceptable standard. Suitable solutions may be screened by observing the solubility of the medicament over the entire recommended storage temperature range. Suspensions of the present invention preferably may be prepared by either the pressure filling or cold filling procedures well-known in the art. For metered dose inhalators, suspensions may be particularly preferred for efficacy and stability considerations. Those skilled in the art may choose to add one or more preservative, buffer, antioxidant, sweetener and/or flavors or other taste masking agents depending upon the characteristics of the formulation. Examples below further describe representative formulations of the present invention, some examples showing alternative formulations "A" and "B". Example I Component wt% Albuterol 0.1 Oleic Acid 0.01 Miglyol 840 9.0 HFC 134a 90.89 Example II Component wt% Albuterol 0.1 Tetronic 150 R1 0.1 Miglyol 840 9.8 HFC 134a 90.0 Example III Component wt% Albuterol 0.1 Pluronic L-121 0.1 Miglyol 840 9.8 HFC 134a 90.0 Example IV Component wt % Albuterol 0.1 Vetrel 245 17.0 Miglyol 840 9 HFC-134a 73.9 Example V Component wt % Albuterol 0.1 Pluronic L-121 0.4 Vertrel 245 16.6 Miglyol 840 9 HFC-134a 73.9 Example VI Component wt % Albuterol 0.10 Pluronic L-121 0.90 Oleic acid 0.01 Miglyol 840 9.00 HFC 134a 89.99 Example VII Component wt % Albuterol 0.10 Tetronic 150 R1 0.10 Oleic Acid 0.01 Miglyol 840 9.80 HFC-134a 89.99 Example VIII Component wt % Mometasone furoate 0.1 Tween 20 0.1 Miglyol 840 9.8 HFC-134a 90.0 Example IX Component wt% Mometasone furoate 0.1 Pluronic L-121 0.4 Miglyol 840 9.0 HFC-13a 90.5 Example X Component wt% Mometasone furoate 0.1 Tetronic 150 R1 0.1 Miglyol 840 9.8 HFC-134a 90 Example XI Component wt% Beclomethasone dipropionate P-11 clathrate 0.1 Oleic acid .01 Miglyol 840 1.5 HFC-134a 98.39 Example XII Component wt % Beclomethasone dipropionate hexane clathrate 0.1 Pluronic L121 .01 Miglyol 840 1.5 HFC-134a 98.3 Example XIII Component wt% Mometasone Furoate 0.1 Miglyol 840 9 Oleic Acid 0.005 Tetronic 150 R1 0.01 HFC-134a 90.885 Example XIV Component wt% Beclomethasone Dipropionate P-11 Clathrate 0.1 Miglyol 840 3 Oleic Acid 0.005 Pluronic L 121 0.01 HFC-134a 96.885 Example XV Component wt% Beclomethasone dipropionate P-11 Clathrate 0.1 Pluronic L-121 0.1 Miglyol 840 1.5 HFC-134a 98.7 Example XVI Component wt% Beclomethasone Dipropionate P-11 Clathrate 0.1 Miglyol 840 1.5 HFC-134a 94.9 While the examples above have been directed at albuterol, mometasone furoate, beclomethasone dipropionate and beclomethasone dipropionate clathrates, it is contemplated that other orally or nasally administered medicaments could be utilized. Similarly, it is contemplated that excipients and surfactants other than those exemplified may be utilized.

Claims: An aerosol formulation comprising: A. an effective amount of a medicament; B. 1,1,1,2-tetrafluoroethane; C. an excipient selected from a propylene glycol diester of a C 6 -C 12 fatty acid and a triglyceride ester of a C 6 -C 12 fatty acid; and D. optionally, one or more components selected from one or more of the following: surfactants; preservatives; buffers; antioxidants; sweeteners; and taste masking agents. A formulation according to claim 1 wherein the medicament is selected from albuterol; mometasone furoate; beclomethasone dipropionate; isoproterenol; heparin; terbutaline; rimiterol; perbuterol; disodium cromoglycate; isoprenaline; adrenaline; pentamidine; ipratropium bromide; and salts and clathrates thereof. A formulation according to claim 2 wherein the medicament is selected from albuterol; albuterol sulfate; beclomethasone dipropionate; bechlomethasone dipropionate clathrates; and mometasone furoate. A formulation according to any preceding claim containing 0.01 to 1 percent by weight medicament. A formulation according to claim 4 containing 0.03 to 0.7 percent by weight medicament. A formulation according to claim 5 containing 0.05 to 0.5 percent by weight medicament. A formulation according to any preceding claim wherein the medicament is a powder having a mean particle size of 1 to 5 microns. A formulation according to any preceding claim wherein the excipient is a diester or triester of C 8 -C 10 fatty acid. A formulation according to any preceding claim comprising 1.5 to 50 percent by weight excipient. A formulation according to Claim 9 comprising 3 to 9.8 percent by weight excipient. A formulation according to any preceding claim for medical use. A formulation according to any preceding claim and comprising a medicament selected from albuterol, mometasone furoate, beclomethasone dipropionate, and salts and clathrates thereof, for the treatment of asthma in mammals.

Inventors: BERRY JULIANNE, CHAUDRY IMTIAZ A, KOPCHA MICHAEL, SEQUEIRA JOEL A, BERRY, JULIANNE, CHAUDRY, IMTIAZ A., KOPCHA, MICHAEL, SEQUEIRA, JOEL A.
Applicants: SCHERING CORP, SCHERING CORPORATION
Application year: 1992
Main classification: A61K9
IPC codes: A61K9, A61K31, C09K3