Yes he has started at doctors advice and doctor has suggested for a week. Is the exposure risk very high in this case?
Your friend did have a risk, however in my opinion, 7 days was too late to start PEP. Recommended time is within 72 hours of the exposure. has he started at an advice of a doctor?
The symptom alone does not tell whether he is infected or not. He should complete the course of the medicine prescribed and 4 weeks after completion, a test may be done