I have had some luck with taking them an hour before my session BCD starts. I've also had the misfortune of taking them (20 mg) 20 minutes before I was supposed to show up at the incall and then have them not work or not work well. THEN, an hour or two after provider tried her damnedest and didn't get a response, I drove home and found out that I could produce a diamond cutter erection.

Timing seems to be everything, especially if you are taking Zocor (simvastatin) or other cholesterol meds as a regular thing. I have an appointment with my urologist in two days and I'm going to ask about the daily low dose of Cialis.