Adults 65 years of age and older—25 mg as a single dose no more than once a day, 1 hour before sexual intercourse. The following information includes only the average doses of this medicine. If you prefer, you may contact the U. Push the plunger of the syringe, then insert the tip into the bottle while holding the bottle upright on a flat surface. Patients should always ask their doctors for medical advice about adverse events. If you have an erection that lasts more than 4 hours, get medical help right away.VIAGRA is available by prescription only in 25 mg, 50 mg, and mg tablets. Patients should always ask their doctors for medical advice about adverse events. You are encouraged to report adverse events related to Viatris products by calling (U.S. only). If you prefer, you may contact the U.S. Food and Drug Administration (FDA.  · For oral dosage form (tablets): Adults up to 65 years of age—50 milligrams (mg) as a single dose no more than once a day, 1 hour before sexual intercourse. Alternatively, the medicine may be taken 30 minutes to 4 hours before sexual intercourse. Sildenafil (Viagra) dosage forms. Tablet. 25mg. 50mg. mg. 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. Sildenafil Citrate mg Tablet. This medicine is Blue, Round Tablet Imprinted With .