Viagra
"My doctor recommended that I print out the coupon from Pfizer for the 3 free tabs before he prescribed Viagra because of the cost.  I was directed to take 1/2 of a 100mg tablet (which was easy to cut in half).  Seemed to start working 45 minutes to one hour after taking.  Worked well, but 4 hours or so after taking it, it wore off.  Yes, was trying more than 1 hardy attempt! This went on for almost a year. Doctor switched me over to Cialis. Cialis has become my "weekend warrior" pill as it lasts almost the entire weekend."