Brand names Why is this medication prescribed? Alpha-blockers are sometimes prescribed for prostate problems or high blood pressure. Sildenafil comes as a tablet and suspension liquid to take by mouth. What special dietary instructions should I follow? Tell your doctor if any of these symptoms are severe or do not go away: headache.1 day ago · Cost: Branded Viagra is priced at $90 per dose regardless of the milligram dosage and you will be able to work with your prescriber to find which dosage is right for you. Sildenafil is also. 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. 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 1 .