The pattern of responses was similar for the other principal question, the ability to achieve an erection sufficient for intercourse. Storage Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light. You are encouraged to report adverse events related to Viatris products by calling U. Stendra avanafil : This is an as-needed medication taken 30 minutes before sex and can last up to six hours. If too much is used, the chance of side effects is increased. The patient addressed both questions at the final visit for the last 4 weeks of the study.25 mg, 50 mg, mg: PAH treatment: oral tablet: 20 mg: liquid suspension: To find out how the cost of Viagra or Revatio compares with the cost of sildenafil, talk with your doctor. Does Viagra’s average price vary based on which strength I take (25 mg, 50 mg, mg)? It’s possible for Viagra’s cost to vary by a few dollars based on the strength you take. Typical dosing for Sildenafil (Viagra) The typical dose is to take 50 mg of sildenafil (Viagra) by mouth, about 1 hour before sex, as needed. The maximum recommended dose is mg. Don’t take sildenafil (Viagra) more than once daily (at any dose). Written by Brian Leonard, PharmD, BCACP, BCGP.