Www.pbm.va.gov
Sildenafil — Sildenafil (Viagra®) should be taken one hour before planned sexual intercourse. Its effect lasts for about four hours; this refers to the time frame that erection is possible if sexual stimulation occurs, not the duration of the erection. The recommended dose is 50 mg for most men; men over the age of 65 should start with 25 mg. ................
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