My first dosage was for 5mg daily. Then my insurance Co. said no more than 8 tabs per month. So I asked to get the dosage upped to 10mg thinking I would take 1 every 4 days. I'm kind of lost because neither dosage works in less than 3 or 4 hours and sometimes my erections aren't what I'd like them to be. They seem to be best at about the 12hr mark. (57yrs. old & 6'3" 210lbs)