A Two Way Cross Over Pharmacokinetic Interaction Study Between Raltegravir and Amlodipine in Healthy Volunteers

HIV-negative male and female volunteers will be enrolled, after written confirmation of informed consent, in a phase I, open-label, cross-over, PK study (approved by Westminster Research Ethics Committee and UK Regulatory Authorities; Eudra number 2012-005400-18).

Subjects are randomized to receive either raltegravir 400mg twice-daily (seven days), followed by raltegravir 400mg twice-daily plus amlodipine 5mg once-daily (seven days), followed by amlodipine 5mg once-daily alone (seven days), or the same treatments in the opposite order, in the fasted state (at least eight hours) with 240mL of water.

Intensive PK sampling and safety laboratory analysis are performed at the end of each phase (Days 7, 14 and 21). Raltegravir and amlodipine plasma concentrations will be analysed by a validated liquid chromatography-mass spectrometry (LC-MS/MS) method.

PK parameters are determined by non-compartmental methods [WinNonlin Phoenix (version 6.1; Pharsight Corp, Mountain View, CA, USA]. These are the concentrations measured 12 and 24 hours post-dose (C12h, C24h) for raltegravir and amlodipine, respectively; the maximum concentration (Cmax); and the area under the curve over 12 and 24 hours (AUC12h, AUC24h) for raltegravir and amlodipine, respectively.

Inclusion criteria

Subjects must meet all of the following inclusion criteria within 28 days prior to the baseline visit:

• The ability to understand and sign a written informed consent form, prior to participation in any screening procedures and must be willing to comply with all study requirements
• Male or non-pregnant, non-lactating females
• Between 18 to 65 years, inclusive
• Body Mass Index (BMI) of 18 to 35 kg/m2, inclusive.
• Women of childbearing potential (WOCBP) must be using an adequate method of contraception to avoid pregnancy throughout the study and for a period of at least 12 weeks after the study
• Willing to consent to their personal details being entered onto The Over-volunteering Prevention Scheme (TOPS) database
• Willing to provide photographic identification at each visit.
• Registered with a GP in the UK

Exclusion criteria

Subjects who meet any of the following exclusion criteria are not to be enrolled in this study.

• Any significant acute or chronic medical illness including hypertension (BP persistently >140/90 mmHg) or hypotension (BP persistently <90/60 mmHg)
• Evidence of organ dysfunction or any clinically significant deviation from normal in physical examination, vital signs, ECG or clinical laboratory determinations
• Positive blood screen for hepatitis B surface antigen and/or C antibodies
• Positive blood screen for HIV-1 and/or 2 antibodies
• Current or recent (within 3 months) gastrointestinal disease
• Clinically relevant alcohol or drug use (positive urine drug screen) or history of alcohol or drug use considered by the Investigator to be sufficient to hinder compliance with treatment, follow-up procedures or evaluation of adverse events. Smoking is permitted, but tobacco intake should remain consistent throughout the study
• Exposure to any investigational drug or placebo within 3 months of first dose of study drug
• Use of any other drugs (unless approved by the Investigator), including over-the-counter medications and herbal preparations, within two weeks prior to first dose of study drug, unless approved/prescribed by the Principal Investigator as known not to interact with study drugs.
• Females of childbearing potential without the use of effective non-hormonal birth control methods, or not willing to continue practising these birth control methods for at least 12 weeks after the end of the treatment period
• Previous allergy to any of the constituents of the pharmaceuticals administered in this trial
• Lactose intolerance