Fasting Study of Levothyroxine Sodium Tablets 300 Mcg to Synthroid® Tablets 300 Mcg
Fasting Study of Levothyroxine Sodium Tablets 300 Mcg to Synthroid® Tablets 300 Mcg
The objective of this study was to investigate the bioequivalence of Mylan's levothyroxine
 sodium 300 mcg tablets to Abbott's Synthroid® 300 mcg tablets following a single, oral 600
 mcg dose (2 × 300 mcg) administered under fasting conditions.
Inclusion Criteria:

 1. Age: 18-50 years.

 2. Sex: Men and/or non-pregnant, non-lactating women.

 1. Women of childbearing potential must have negative serum β human chorionic
 gonadotropin (HCG) pregnancy tests performed within 14 days prior to of the study
 and on the evening prior to each dose administration. An additional serum (β HCG)
 pregnancy test will be performed upon completion of the study.

 2. Women of childbearing potential must practice abstinence or be using an
 acceptable form of contraception throughout the duration of the study. Oral
 contraceptives are not to be used within 3 months prior to dosing and throughout
 the course of the study due to the fact that they increase serum TBG
 concentrations, and therefore, elevate T4. Acceptable forms of contraception
 include the following:

 1. intrauterine device in place for at least 3 months prior to the start of the
 study and remaining in place during the study period, or

 2. barrier methods containing or used in conjunction with a spermicidal agent,
 or

 3. postmenopausal accompanied with a documented postmenopausal course of at
 least one year or surgical sterility (tubal ligation, oophorectomy or
 hysterectomy).

 3. Weight: At least 60 kg (132 lbs) for men and 48 kg (106 lbs) for women, and within 15%
 of Ideal Body Weight (IBW), as referenced by the Table of "Desirable Weights of
 Adults" Metropolitan Life Insurance Company, 1983 (See Part II Administrative Aspects
 of Bioequivalence Protocols).

 4. All subjects should be judged normal (euthyroid) and healthy during a prestudy medical
 evaluation (physical examination, laboratory evaluation, blood chemistry, serum T4
 (free and total), serum T3 (total only), serum thyroid-stimulating hormone (TSH),
 serum thyroxine-binding globulin (TBG), hepatitis B and hepatitis C tests, HIV test,
 12-lead ECG, and urine drug screen including amphetamine, barbiturates,
 benzodiazepine, cannabinoid, cocaine, opiate screen, phencyclidine, and methadone)
 performed within 14 days of the initial dose of study medication.

 Exclusion Criteria:

 1. Institutionalized subjects will not be used.

 2. Social Habits:

 1. Use of any tobacco-containing products within 1 year of the start of the study.

 2. Ingestion of any alcoholic, caffeine- or xanthine-containing food or beverage
 within the 48 hours prior to the initial dose of study medication.

 3. Ingestion of any vitamins or herbal products within 7 days prior to the initial
 dose of the study medication.

 4. Any recent, significant change in dietary or exercise habits.

 5. A positive test for any drug included in the urine drug screen.

 6. History of drug and/or alcohol abuse.

 3. Medications:

 1. Use of any prescription or over-the-counter (OTC) medications within the 30 days
 prior to the initial dose of study medication. These may include but is not
 limited to: infant soybean formula, steroids, salicylates, preparations
 containing iodine, such as vitamins; oral anti-diabetic agents; all resins for
 lowering of cholesterol, such as cholestyramine; sucralfate, propranolol,
 amiodarone, phenytoin, carbamazepine, furosemide; aluminum-containing antacids,
 including aluminum hydroxide; rifampin, calcium channel blockers and ferrous
 sulfate.

 2. Use of any hormonal contraceptives or hormone replacement therapy within 3 months
 prior to study medication dosing.

 3. Use of any medication known to alter hepatic enzyme activity within 28 days prior
 to the initial dose of study medication.

 4. Diseases:

 1. History of any significant cardiovascular, hepatic, renal, pulmonary,
 hematologic, gastrointestinal, endocrine, immunologic, dermatologic, or
 neurologic disease.

 2. Acute illness at the time of either the pre-study medical evaluation or dosing.

 3. A positive HIV, hepatitis B, or hepatitis C test.

 4. History of any thyroid disease.

 5. Subjects with any underlying medical condition known to interfere with the
 absorption or metabolism of thyroid hormones.

 5. Abnormal and clinically significant laboratory test results:

 1. Clinically significant deviation from the Guide to Clinically Relevant
 Abnormalities (See Part II ADMINISTRATIVE ASPECTS OF BIOEQUIVALENCE PROTOCOLS).

 2. Abnormal and clinically relevant ECG tracing.

 3. Any thyroid function test outside normal limits.

 6. Donation or loss of a significant volume of blood or plasma (> 450 mL) within 28 days
 prior to the initial dose of study medication.

 7. Subjects who have received an investigational drug within 30 days prior to the initial
 dose of study medication.

 8. Subjects who received any surgical treatment within 6 months prior to the initial dose
 of study medication.

 9. Subjects with known allergies or hypersensitivity to thyroid preparations or their
 inactive ingredients.

 10. History of difficulties in swallowing, or any gastrointestinal disease which could
 affect the drug absorption.

 11. Consumption of grapefruit or grapefruit containing products within 7 days of drug
 administration.

 12. Consumption of products containing walnuts, cotton seed meal, soybean flour or dietary
 fiber within 48 hours of drug administration.