The information provided is for educational purposes only and is not intended to replace discussions with a healthcare provider. Alternatively, the medicine may be taken 30 minutes to 4 hours before sexual intercourse. You are encouraged to report adverse events related to Viatris products by calling U. If you need emergency medical care for a heart problem, it is important that your doctor knows when you last took sildenafil. Please expect up to 4 to 6 weeks for reimbursement. Trimazosin Other Interactions Certain medicines should not be used at or around the time of eating food or eating certain types of food since interactions may occur. This medication is taken with or without food an hour before sex.Viagra comes as tablets that you take by mouth, when needed. Available strengths: 25 mg, 50 mg, mg. Viagra comes in these strengths: 25 milligram (mg), 50 mg, and mg. Sildenafil (Viagra). Tadalafil (Cialis). Vardenafil. These medicines are called PDE5 inhibitors. They enhance the effects of a chemical the body makes that relaxes muscles . Find patient medical information for Viagra oral on MD including its uses, side effects and safety, interactions, pictures, warnings and user ratings.