"44 YO male, first time user, very healthy, good shape. Started having less than effective erections 2 years ago. Possibly linked to back surgery.  Saw my MD this week after reading Cialis reviews. Decided to try it on a night by myself, so there&#039;s no pressure. Last night  (Friday) I took 1/2 of 20mg tab and waited a couple of hours. I noticed no change, though I was stimulating, so I took the other half. A couple of hours later I saw a bit of impact.  Woke up with a hard erection, which I haven&#039;t done in a while. Throughout today 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.  Have a mild headache."