I came down once from 100 mg /day. I had 50 for a week or little longer, then 25mg/half pill/ for an other week or two.... then the rest I have left took every second day. I felt perfect for 3-4 weeks or so without it, then my BP went up over 200, so I was running back to my doctor.
Think about that if he also has High BP.
Good luck to him!