Drug-Drug Interaction Study of Qualaquin and Midazolam

Phase 1

Completed

Conditions: Healthy

Interventions: Drug: Midazolam Alone
Drug: Qualaquin (quinine) alone steady state
Drug: Midazolam and Qualaquin at steady state

Registration Number: NCT00785486

Lead Sponsor: Mutual Pharmaceutical Company, Inc.

Brief Summary: This is an open label non-randomized single sequence, single group two way drug interaction study in healthy adult volunteers to determine the extent to which quinine, an inducer of cytochrome p450 CYP 3A4, affects the pharmacokinetics of midazolam, an accepted probe drug for CYP 3A4. The study will also determine the extent to which midazolam affects the pharmacokinetics of quinine.

Detailed Description: This is an open label single sequence single group non-randomized two way drug interaction study in healthy adult volunteers to determine the extent to which quinine, an inducer of cytochrome p450 CYP 3A4, affects the pharmacokinetics of midazolam, an accepted probe drug for CYP 3A4. The study will also determine the extent to which midazolam affects the pharmacokinetics of quinine. This will compare the pharmacokinetics of midazolam and quinine at baseline to their kinetics when they are taken together in 24 normal healthy adult volunteers who will serve as their own controls. All patients will be confined to the study site throughout the entire 11 day study period. On day 1 after a fast of at least 10 hours, all study participants will receive a single oral dose of midazolam 2 mg. Blood will be drawn at times sufficient to adequately define the baseline concentration time curve for midazolam and its metabolite, 1-hydroxy-midazolam. On the morning of day 4, after a 3 day washout period and following a fast of at least 10 hours, all volunteers will begin a regimen of 324 mg of quinine sulfate by mouth every 8 hours. All subjects will continue this regimen from day 4-10 (21 total doses). Blood will be drawn after the first daily dose of quinine on days 4 and 9 at times sufficient to adequately define the baseline and steady state concentration time curves for quinine. Additional blood will be drawn prior to the first daily dose of quinine on days 7,8,9,and 10. On day 10 after a fast of at least a 10 hours, all participants will receive both midazolam 2 mg and quinine 324 mg together. Blood will be drawn a times sufficient to characterize the pharmacokinetics of midazolam, 1-hydroxy-midazolam and quinine under the stated conditions.

Recruitment & Eligibility

Status: COMPLETED

Sex: All

Target Recruitment: 24

Inclusion Criteria

Medically healthy non-smoking, non-obese (≥ 60 kg males, ≥52 kg females within 15% of IBW) adult volunteers 18-45 years of age

Exclusion Criteria

Subjects with history or presence of significant cardiovascular disease (including hypotension, hypertension, bradycardia or EKG abnormalities), pulmonary, hepatic, gallbladder or biliary tract, renal, hematologic, gastrointestinal, endocrine, immunologic, dermatologic, neurologic, psychiatric disease or an active sexually transmitted disease.
Subjects with significant blood loss in the prior 56 days, plasma donation within 7 days , hemoglobin < 12.0 g/dl or who have participated in another clinical trial within the prior 30 days.
Subjects with recent (2-year) history or evidence of alcoholism or drug abuse.
Subjects who have used any drugs or substances known to inhibit or induce cytochrome P450 (CYP) enzymes 10 days or 28 days respectively prior to the first dose and throughout the study.
Subjects who have received monoamine oxidase inhibitors or been on a special diet within 28 days of starting the study.
Subjects who test positive at screening for human immunodeficiency virus (HIV), hepatitis B surface antigen (HbsAg), or hepatitis C virus (HCV).

Subjects who are pregnant or lactating, taking hormone replacement therapy or have known allergies to quinine sulfate, mefloquine, quinidine or midazolam and other benzodiazepines.

Study & Design

Study Type: INTERVENTIONAL

Study Design: SINGLE_GROUP

Arm && Interventions

Group	Intervention	Description
Midazolam alone	Midazolam Alone	Baseline midazolam and 1-hydroxy-midazolam pharmacokinetics. One day 1 after a fast of at least 10 hours patients received a single oral dose of midazolam 2 mg. Blood was drawn at times sufficient to characterize the pharmacokinetics of midazolam and its main metabolite.
Qualaquin (quinine) alone steady state	Qualaquin (quinine) alone steady state	On the morning of day 9 after taking Qualaquin (quinine) capsules 324 mg orally every 8 hours for the prior 5 days, and following a fast of at least 10 hours all study participants received their usual morning dose of Qualaquin (quinine) 324 mg. Blood was drawn at times sufficient to determine the steady state Cmax and AUC 0-tau for Qualaquin (quinine).
Midazolam with Qualaquin (quinine)	Midazolam and Qualaquin at steady state	On day 10 after taking Qualaquin (quinine) for 6 days according to the stated regimen, all participants took their usual dose of Qualaquin (quinine) with an oral dose of midazolam 2 mg. Blood was drawn sufficient to characterize the steady state kinetics of quinine and the kinetics of midazolam and 1-hydroxy-midazolam in the presence of each other.

Primary Outcome Measures

Name	Time	Method
Maximum Serum Concentration (Cmax)	Day 1 (Midazolam Alone), Day 9 (Qualaquin (quinine) Alone), Day 10 Midazolam with Qualaquin (quinine)	Maximum serum concentration(Cmax)
Area Under the Concentration Time Curve From Zero to T (AUC 0-t) for Midazolam and 1-hydroxy Midazolam at Baseline and With Qualaquin (Quinine) at Steady State.	Days 1 and 10 at 0.167, 0.25, 0.5, 0.75, 1, 1.25, 1.5, 2, 3, 4, 6, 7.917, 12, 15 and 24 hours	Area under the concentration time curve(AUC 0-t) calculated by the linear trapezoidal method from time 0 to 24 hours, for Midazolam and 1-hydroxy-midazolam on day 1 (midazolam alone) and day 10 (midazolam with Qualaquin -(quinine) at steady state to determine if a significant drug interaction occurs between midazolam and quinine
Area Under the Concentration Time Curve From Zero to Infinity (AUC Inf) for Midazolam and 1 Hydroxy Midazolam Before (Day 1) and After (Day 10) Qualaquin (Quinine).	Days 1 and 10 at 0.167, 0.25, 0.5, 0.75, 1, 1.25, 1.5, 2, 3, 4, 6, 7.917, 12, 15 and 24 hours	AUC inf for Midazolam and hydroxy-midazolam on day 1 (midazolam alone) and day 10 (midazolam with steady state Qualaquin(quinine)- the sum of AUC0-t plus the ratio of the last measured plasma concentration to the elimination rate constant to determine whether a significant drug interaction occurs between midazolam and quinine
The Area Under the the Concentration Time Curve From Zero to Tau (0-8hrs) for Qualaquin (Quinine) AUC Tau Before and After Midazolam	Days 9 and 10 at 0, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 5, 6, 7, and 7.917 hours	Qualaquin (quinine) - AUC tau alone at steady state (day 9) and in the presence of coadministered midazolam 2 mg (day 10) over the dosing interval (0 - 8 hours), as calculated by the linear trapezoidal method.