Phase I, Single-center, Open Label, Fixed-sequence Cross-over Study to Evaluate the Effect of Rifabutin on the Pharmacokinetics of Oral Cabotegravir in Healthy Subjects
Phase I, Single-center, Open Label, Fixed-sequence Cross-over Study to Evaluate the Effect of Rifabutin on the Pharmacokinetics of Oral Cabotegravir in Healthy Subjects
This is a Phase I, single-center, open-label, fixed-sequence, 2-period crossover study in healthy adults to evaluate the effect of oral rifabutin (RBT) 300 milligram (mg) on the pharmacokinetics of oral cabotegravir (CAB) 30 milligram ( mg). This study will evaluate the drug-drug interaction (DDI) potential between CAB and RBT to inform dosing strategies for tuberculosis in subjects receiving CAB for human immunodeficiency virus (HIV) treatment or prevention. In Treatment Period 1 (Treatment A) participants will receive CAB 30 mg once daily for 14 days, followed by Treatment Period 2 (Treatment B) where participants will receive RBT 300 mg once daily with CAB 30 mg once daily for 14 days. The total study duration will be approximately for 10 weeks. Approximately 15 healthy subjects will be enrolled to ensure that 12 subjects complete dosing and critical assessments.
Inclusion Criteria
Males and females between 18 and 65 years of age inclusive, at the time of signing the informed consent.
Healthy as determined by the investigator or medically qualified designee based on a medical evaluation including medical history, physical examination, laboratory tests and cardiac monitoring.
A subject with a clinical abnormality or laboratory parameter(s) which is/are not specifically listed in the inclusion or exclusion criteria, outside the reference range for the population being studied may be included only if the investigator in consultation with the Medical Monitor agree and document that the finding is unlikely to introduce additional risk factors and will not interfere with the study procedures. Additionally, laboratory assessments that are specifically listed in the inclusion or exclusion criteria and are outside of the reference range can be repeated once during the screening period.
Body weight >=50 kilogram (kg) and body mass index (BMI) within the range 18.5 - 31.0 kg/ meter square (kg/m^2) (inclusive).
A female subject is eligible to participate if she is not pregnant (as confirmed by a negative serum human chorionic gonadotrophin (hCG) test), not lactating, and if she is of:
The investigator is responsible for ensuring that subjects understand how to properly use these methods of contraception.
Exclusion Criteria
Current or chronic history of liver disease, or known hepatic or biliary abnormalities (with the exception of Gilbert's syndrome or asymptomatic gallstones).
History of clinically significant cardiovascular disease including
History of inflammatory bowel disease.
History of cholecystectomy or other gastrointestinal surgery (except appendectomy more than three months prior to study).
History of peptic ulceration or pancreatitis within the preceding 6 months of screening.
Participants determined by the Investigator to have a high risk of seizures, including participants with an unstable or poorly controlled seizure disorder. A participant with a prior history of seizure may be considered for enrolment if the Investigator believes the risk of seizure recurrence is low. All cases of prior seizure history should be discussed with the Medical Monitor prior to enrolment.
Current or past history of uveitis.
Any other medical condition which, in the judgment of the investigator and medical monitor, could jeopardize the safety of the subject or the integrity of the data derived from that subject. This includes but is not limited to any pre-existing condition that interferes with normal gastrointestinal anatomy or motility that could interfere with the absorption, metabolism, and/or excretion of the study drug.
Unable to refrain from the use of prescription or non-prescription drugs, including vitamins, herbal and dietary supplements (including St John's Wort) within 7 days (or 14 days if the drug is a potential enzyme inducer) or 5 half-lives (whichever is longer) prior to the first dose of study medication, unless in the opinion of the Investigator and ViiV Medical Monitor the medication will not interfere with the study procedures or compromise subject safety.
History of regular alcohol consumption within 6 months of the study defined as an average weekly intake of >14 drinks. One drink is equivalent to 12 gram of alcohol, 12 ounces (360 mL) of beer, 5 ounces (150 mL) of wine or 1.5 ounces (45 mL) of 80 proof distilled spirits.
A history of regular use of tobacco, or nicotine-containing products within 30 days prior to screening.
History of sensitivity to any of the study medications, or components thereof or a history of drug or other allergy that, in the opinion of the investigator or Medical Monitor, contraindicates their participation.
Presence of Hepatitis B surface antigen (HBsAg) positivity at screening or within 3 months prior to first dose of study treatment. Positive Hepatitis B core antibody (HBcAb) with negative hepatitis B surface antibody should also be excluded.
Positive Hepatitis C antibody test.
A positive pre-study drug/alcohol screen.
A positive test for HIV antibody.
A positive QuantiFERON Gold test or clinical evidence of tuberculosis (TB) infection.
Where participation in the study would result in donation of blood or blood products in excess of 500 mL within a 56 day period.
The subject has participated in a clinical trial and has received an investigational product within the following time period prior to the first dosing day in the current study: 30 days, 5 half-lives or twice the duration of the biological effect of the investigational product (whichever is longer).
Exposure to more than four new chemical entities within 12 months prior to the first dosing day.