Different drugs, or do I simply take more I use 5mg daily cialis, taken AM. Works fine on day 3. No side effects. My wife & I plan ahead, so that is OK for us. I then quit for a couple of weeks until we again feel up to it - we are both elderly & it's better than never - and another round until day 3. I am also a radical prostatectomy survivor, requiring Edex (alprostadil) just before. Works noticeably better than Edex alone. I use both with direction from my urologist. I take no other medicines, and am in excellent health otherwise. But 1 pill an hour or two ealier with Edex would obviously add a little spontaneity compared to 3 days. If so, can I just increase my dosage from 5 to, say 20 & have it work in a couple of hours as effectively as it does now? My Dr. doesn't seem able to answer it. Could I just try it?