Conditions: Hepatitis C
Keywords: Healthy volunteers
Allocation: NA | Intervention model: SINGLE_GROUP
Enrollment: 13
Healthy volunteers: yes

Brief summary:
This is a healthy volunteer study looking at the interactions between two drugs: boceprevir and sildenafil.

New drugs are being developed to treat people with the chronic viral infection hepatitis C. Very little is know how these new treatments interact with other medications such as the drugs used to treat erectile dysfunction.

The purpose of this study is to look at levels of both a new hepatitis C drug called boceprevir (BOC) and an existing erectile dysfunction drug called sildenafil to see if they affect the blood levels of each other when given separately and together.

Detailed description:
Total duration for each participant will be up to 40 days plus a screening visit 1 - 3 weeks prior to the start of the study.

They will visit the clinic on 10 occasions: screening visit, baseline visit (day 0), day 1, a visit between day 4 and 7, day 10, day 14, day 15, day 16, day 17 and a follow up visit between days 26 and 40.

The total amount of blood collected from participants during the entire study will be no greater than 350 ml in total (around 23 tablespoons).

At the screening visit a clinical assessment will be performed. At the baseline visit participants will attend the clinic fasted and will be required to remain on the unit for approximately 14 hours.

On the morning of the visit clinical assessments will be performed. Sildenafil 25mg (1 tablet) will be administered with a standardised meal. Blood samples will be taken at the following times in order to measure the levels of sildenafil in the blood: predose,0.5, 1, 2, 3, 4, 6, 8, 10,12 and 24 hours post dose.

On day Day 10 boceprevir will be initiated 800mg (4 capsules 3 times a day) for the next 4 days on day 14 the participants will attend the clinic for a witnessed dose of boceprevir and safety assessment.

On day 15 the participants will attend for their 2nd long visit (10 hours) when they will be administered boceprevir (BOC) 800mg (4 capsules) with a standardised meal then have blood samples taken at the following times in order to measure the levels of BOC in the blood: predose,0.5, 1, 2, 3, 4, 6 and 8 hours post dose.

After the 8 hour blood collection participants will be administered boceprevir (BOC) 800mg (4 capsules) with food and they will self administer BOC 800mg (4 capsules) with food at home 8 hours later.

On day 16 participants will attend for the 3rd long visit (14 hours) where they will be administered boceprevir (BOC) 800mg (4 capsules) and sildenafil 25mg with a standardised meal. Blood samples will be taken at the following times in order to measure the levels of both BOC and sildenafil in the blood: predose,0.5, 1, 2, 3, 4, 6 and 8 hours post dose.

After the 8 hour blood collection participants will be administered boceprevir (BOC) 800mg (4 capsules) with food and will then self administer BOC 800mg (4 capsules) with food at home 8 hours later. This will be their last dose of study medication. They will return the next day for a final blood test post 24 hours. A final visit between days 26 and 40 will be performed including clinical assessments.

Arms:
arm 1: Healthy volunteers

Interventions: intervention 1: Sildenafil and Boceprevir
Intervention descriptions: intervention 1: 25mg once/800mg three times a day

Protocol document: