44 YO male, first time user, very healthy and good shape. Just started having less than effective errections 2 years ago. Saw my MD this week after reading reviews. Decided to try it on a night by myself, so there's no pressure. Last night I took 1/2 of 20mg tab and waited a couple of hours. I noticed no real change so I took the other half. A couple of hours later I saw a bit of impact. I slept ok but had rapid and vivid dreams. Woke up with a hard erection, which I haven't done in a while. Noticed throughout the day the erection comes/goes very well. Is it supposed to take this long? Also, I thought the pills were scored to easily cut. Mine are not scored.