This study is being conducted to confirm that GSK1322322 has no negative impact on hormone levels and contraceptive efficacy when co-administered with a frequently prescribed oral contraceptive thereby to facilitate the use of GSK1322322 in women of child-bearing potential receiving oral contraceptive (OC) pre-infection. This study is designed to investigate steady-state plasma ethinyl estradiol (EE) and norethindrone (NE) pharmacokinetic (PK) following administration of Ortho-Novum (EE/NE) 1 tablet every 24 hours (q24h) fed with and without GSK1322322 1500 milligram (mg) q12h fed. Each subject will participate in the study for approximately 12 weeks: a 30 day screening period, 4-week run-in period, three 7 day treatment periods, and a 3-5 day follow-up period. The study is planned to enroll approximately 24 subjects (18 active/6 placebo).
Please note that Ortho-Novum is a registered trademark of Ortho Pharmaceutical Corporation.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
SINGLE
Oral tablets with unit dose strength of 500mg and dose level of 1500mg (3 x 500mg) for twice a day administration for 7 days in treatment phase
Oral contraceptive tablet containing 0.035mg EE and 1mg NE for once daily administration for 21 days in run-in phase and 21 days in treatment phase
GSK1322322 matching placebo tablets for twice a day administration (3 tablets each time) for 7 days in treatment period.
EE/NE matching placebo tablet for once daily administration for 7 days in run-in phase.
Composite of PK parameters of EE/NE to compare the steady state plasma PK. If data permit, after EE/NE alone for 7 days and after EE/NE with GSK1322322 for 7 days.
PK parameters include: steady-state area under the concentration-time curve over the dosing interval (AUC\[0-tau\]), maximum observed concentration (Cmax), time of occurrence of Cmax (Tmax), minimum observed concentration (Cmin), and terminal phase half-life (t1/2)
Time frame: Plasma PK samples will be collected at pre-dose, 0.25, 0.5, 1, 1.5, 2, 3, 4, 6, 8, 12 and 24 hours on Day 7, 14 and 21 of both run-in phase and on treatment phase.
Composite of PK parameters of GSK1322322 following co-administration of GSK1322322 and EE/NE for 7 days
PK parameters include: steady-state AUC(0-tau), Cmax, Tmax
Time frame: Plasma PK samples will be collected at pre-dose, 0.25, 0.5, 1, 1.5, 2, 3, 4, 6, 8 and 12 hours post morning dose on day 7, 14, and 21 of treatment phase.
Number of subjects with adverse events (AEs) as a measure of safety and tolerability
AEs will be collected from the start of Study Treatment and until the follow-up contact.
Time frame: 8 weeks
Concurrent medication assessment as a measure of safety and tolerability
Time frame: 8 weeks
Laboratory parameter assessment as a measure of safety and tolerability
Laboratory parameters include: hematology, clinical chemistry, urinalysis and additional parameters
Time frame: 8 weeks
Electrocardiogram (ECG) assessment as a measure of safety and tolerability.
12-lead ECGs will be obtained at each time point using an ECG machine that automatically to calculate the heart rate and measures PR, QRS, QT, and QT interval corrected for heart rate
Time frame: 8 weeks
Vital sign measurement as a measure of safety and tolerability
Vital sign measurements will include systolic and diastolic blood pressure, temperature, and pulse rate
Time frame: 8 weeks
Pre-dose serum level of Lutenizing Hormone (LH).
LH will be evaluated as surrogate marker of contraceptive efficacy
Time frame: 7 weeks
Pre-dose serum level of Follicle stimulating hormone (FSH)
FSH will be evaluated as surrogate marker of contraceptive efficacy
Time frame: 7 weeks
Pre-dose serum level of Progesterone
Progesterone will be evaluated as surrogate marker of contraceptive efficacy
Time frame: 7 weeks
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