A Pharmacokinetic Study of Colchicine With an Oral Contraceptive

Condition(s) targeted: Pharmacokinetics

Intervention: Norethindrone/Ethinyl Estradiol (Drug); Colchicine (Drug); Placebo (for Colchicine) (Drug)

Phase: Phase 1

Status: Completed

Sponsored by: Mutual Pharmaceutical Company, Inc.

This study will evaluate the effect, if any, of twice daily dosing of colchicine 0. 6 mg at steady state on the steady state pharmacokinetic profile of ethinyl estradiol and norethindrone (Ortho-Novum 1/35). It will also evaluate the effects, if any, of steady state ethinyl estradiol and norethindrone on colchicine at steady state. Finally, this study will assess the safety and tolerability of concurrent use of colchicine and an estrogen/progesterone-containing oral contraceptive.

Official title: A Pharmacokinetic Study to Evaluate the Effect of Colchicine on the Pharmacokinetic Profile of an Oral Contraceptive Containing Ethinyl Estradiol and Norethindrone in Healthy Women

Study design: Allocation: Randomized, Endpoint Classification: Pharmacokinetics Study, Intervention Model: Crossover Assignment, Masking: Double Blind (Subject, Investigator), Primary Purpose: Basic Science

Primary outcome:

Maximum Plasma Concentration of Norethindrone With Colchicine at Steady State (Cmax, ss)

Maximum Plasma Concentration of Norethindrone With Placebo at Steady State (Cmax, ss)

Maximum Plasma Concentration of Ethinyl Estradiol With Colchicine at Steady State (Cmax, ss)

Maximum Plasma Concentration of Ethinyl Estradiol With Placebo at Steady State (Cmax, ss)

Maximum Plasma Concentration of Colchicine With Norethindrone/Ethinyl Estradiol at Steady State (Cmax, ss)

Area Under the Concentration Versus Time Curve From Time 0 to Time t [AUC(0-t)] for Norethindrone With Colchicine

Area Under the Concentration Versus Time Curve From Time 0 to Time t [AUC(0-t)] for Norethindrone With Placebo

Area Under the Concentration Versus Time Curve From Time 0 to Time t [AUC(0-t)] Ethinyl Estradiol With Colchicine

Area Under the Concentration Versus Time Curve From Time 0 to Time t [AUC(0-t)] for Ethinyl Estradiol With Placebo

Area Under the Concentration Versus Time Curve From Time 0 to Time t [AUC(0-t)] for Colchicine With Norethindrone/Ethinyl Estradiol

Detailed description: This study will evaluate the effect, if any, of twice daily dosing of colchicine 0. 6 mg at steady state on the steady state pharmacokinetic profile of ethinyl estradiol and norethindrone (Ortho-Novum 1/35). It will also evaluate the effects, if any, of steady state ethinyl estradiol and norethindrone on colchicine at steady state. Finally, this study will assess the safety and tolerability of concurrent use of colchicine and an estrogen/progesterone-containing oral contraceptive. Following an optional single cycle run-in period in which subjects taking other oral contraceptives are switched to Ortho-Novum 1/35, 30 healthy adult female volunteers of child bearing age (18-45 years old) will be randomized in a double blind crossover fashion to receive each of two ethinyl estradiol and norethindrone dosing regimens in sequence. During each of the two dosing periods, subjects will receive one ethinyl estradiol and norethindrone tablet on the mornings of Days 1-7 of their cycles. On days 8-21, subjects will receive twice daily doses of either colchicine (0. 6 mg capsule twice daily with breakfast and dinner) or the placebo (one capsule twice daily with breakfast and dinner), according to their randomization schedule, along with one ethinyl estradiol and norethindrone tablet. Subjects will receive the alternate dosing regimen in Cycle 2. Blood samples will be drawn at times sufficient to determine the steady state pharmacokinetics of ethinyl estradiol and norethindrone with and without steady state colchicine. In addition, during the cycle in which active colchicine is given, the effect of steady state ethinyl estradiol and norethindrone on steady state colchicine will be evaluated. Subjects will be monitored for adverse effects throughout the study via query and spontaneous reporting. Additionally baseline 12 lead EKG and vital signs will be compared to those obtained at time points throughout the study period.

Minimum age: 18 Years. Maximum age: 45 Years. Gender(s): Female.

Criteria:

Inclusion Criteria:

- Healthy, non-smoking female volunteers of childbearing potential aged 18 to 45 years

weighing at least 55 kg and within 15% of ideal body weight who are taking oral contraceptives on the advice of their personal health care provider and willing to switch to Ortho-Novum 1/35

- Subjects should be either sexually inactive or using a double barrier method of

contraception for 14 days before the first dose of study drug and throughout the study Exclusion Criteria:

- Pregnant or lactating

- Recent (2-year) history or evidence of alcoholism or drug abuse

- Test positive at screening for human immunodeficiency virus (HIV), hepatitis B

surface antigen (HbsAg), or hepatitis C antibody (HCV)

- History or presence of significant cardiovascular, pulmonary, hepatic, renal,

hematological, gastrointestinal, endocrine, immunologic, dermatologic, neurological, or psychiatric disease

- Hemoglobin < 12 g/dL

- Use of any drugs or substances known to inhibit or induce cytochrome (CYP) P450

enzymes and/or P-gp within 30 days prior to the first dose of Ortho-Novum® 1/35 or expected to require such use

PRACS Institute, Ltd. - Cetero Research, Fargo, North Dakota 58104, United States

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Starting date: August 2007
Last updated: December 30, 2009