Bioequivalence Study of Cephalexin Tablets 1g

Study Overview
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Brief Summary
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The objective of this study was to confirm if two formulations of cephalexin tablets are bioequivalent. Test product was Ceporex® (1 g Cephalexin; GlaxoSmithKline) and reference product Keflex® (1 g Cephalexin; Eli Lilly). The single dosage was one tablet. The study was prospective, open-label, randomized, crossover, single dose, with 02 treatments, 02 sequences and 02 periods, under fasting conditions. The population was composed of 26 healthy volunteers, both genders, adults between 18-40 years. The comparative bioavailability of the two formulations was evaluated based in statistical comparisons of relevant pharmacokinetic parameters, obtained from data of drug concentrations in blood.

Official Title
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Open, Two Periods, Two Treatments, Two Sequences, Cross-over, Randomized Study With Single Dosage of Two Oral Preparations Containing 1 g of Cephalexin (GlaxoSmithKline México, S.A. de C.V. vs. Keflex® 1g, Eli Lilly y Compañía de México, S.A. de C.V.) in Fasting Healthy Volunteers.

Conditions
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Infections, Respiratory Tract

Intervention / Treatment
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* Drug: Cephalexin 1g tablets
* Drug: Cephalexin 1g tablets


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Free will participation according to Mexican regulation, Helsinki Declaration, and Good Clinical Practice. Healthy, between 18 and 40 years. Body Mass Index between 19 and 27 In good health by complete medical history and laboratory tests. Blood pressure 130-90/ 90-60 mm Hg; heart rate 55-100 beat per minute, respiratory rate 14-20 movements per minute. Laboratory tests +/- 10% of normal interval (blood cytology, blood chemistry 27 elements, Hepatitis B and C antigens, HIV, urinalysis, anti-doping, pregnancy, electrocardiogram) - Exclusion Criteria: Alteration of vital signs Not complying with inclusion criteria History of cardiovascular, kidney, hepatic, muscular, metabolic, gastrointestinal (including constipation), neurologic, endocrine, hematopoietic (any kind of anemia), asthma, mental or organic disease. Those suffering from muscular trauma 21 days before the beginning of the study. Requirement of any kind of medication during the course of the study, except study medication. History of dyspepsia, gastritis, esophagitis, duodenal or gastric ulcer. Exposure to medications known as inducers or inhibitors of hepatic enzymes or administration of potentially toxic medication in the 30 days before the study beginning. Administration of any medication in the 14 days or 5 half-lives (whatever longer) previous to the beginning of the study. Hospitalization for any cause in the seven months before the beginning of the study. Administration of investigational drugs in the 60 days before the study. Allergy to any antibiotic or non-steroidal anti-inflammatory analgesic. Alcohol ingestion or intake of beverages containing xanthines (coffee, tea, cocoa, chocolate, mate, cola drinks) or ingestion of charcoal grilled food or grapefruit or orange juice in the 72 hours before the hospitalization or tobacco smoking in the 72 hours before the beginning of the study. Blood donation or loss => 450 ml in the 60 days before the beginning of the study. History of drug or alcohol abuse. Positive pregnancy test. Special diet requirement, for instance vegetarian diet. Inability to understand nature, aims, and possible consequences of the study. Evidence of non-cooperative attitude during the study. -

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 40 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Other
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: A (reference)/ B (test)<br>initial administration of reference and cross-over to test | Drug: Cephalexin 1g tablets<br>* Reference product<br>* Other names: KEFLEX® is a trademark of ELI LILLY;Drug: Cephalexin 1g tablets<br>* Test product<br>* Other names: CEPOREX® is a trademark of GLAXOSMITHKLINE;|
| Experimental: B (test)/ A (reference)<br>initial administration of test and cross-over to reference | Drug: Cephalexin 1g tablets<br>* Reference product<br>* Other names: KEFLEX® is a trademark of ELI LILLY;Drug: Cephalexin 1g tablets<br>* Test product<br>* Other names: CEPOREX® is a trademark of GLAXOSMITHKLINE;|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Peak Plasma Concentration (CMAX) of cephalexin | Pharmacokinetics | 0.0, 0.25, 0.5, 0.75, 1.0, 1.25, 1.5, 1.75, 2.0, 2.5, 3.0, 3.5, 4.0, 5.0, 6.0, and 7.0 postdosage | 
| Area under the plasma concentration versus time curve (AUC) of cephalexin | Pharmacokinetics | 0.0, 0.25, 0.5, 0.75, 1.0, 1.25, 1.5, 1.75, 2.0, 2.5, 3.0, 3.5, 4.0, 5.0, 6.0, and 7.0 postdosage | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Pharmacokinetics, Bioequivalence, Mexico, Cephalexin