Sildenafil (Viagra) Tadalafil (Adcirca, Cialis) Vardenafil (Levitra, Staxyn) Avanafil (Stendra) All four medications enhance the effects of nitric oxide — a natural .These are commonly prescribed for an enlarged prostate or male pattern baldness. Recent heart or blood vessel problems. If you are a Mayo Clinic patient, this could include protected health information. Brand names Why is this medication prescribed? You can take it in a small dose daily or in a larger dose as needed. Alpha-blockers are sometimes prescribed for prostate problems or high blood pressure. Its effects might last longer if you have mild to moderate ED.The Savings Offer and Program expire on 12/31/ For further information, call , visit , or write: Viatris Inc., P.O. Box , Mission, KS . Sildenafil is a prescription drug. It comes in the form of a tablet and suspension (liquid). Both are taken by mouth. It also comes in an intravenous (IV) form, . Sildenafil (Viagra) Tadalafil (Adcirca, Cialis) Vardenafil (Levitra, Staxyn) Avanafil (Stendra) All four medications enhance the effects of nitric oxide — a natural .Do not take a double dose to make up for a missed one. Its effects often last for 4 to 5 hours. This medication is taken with or without food an hour before sex. These products are especially dangerous for anyone who takes nitrates. If you ever need emergency medical treatment for a heart problem, the healthcare providers who treat you will need to know when you last took sildenafil. The following nonprescription or herbal products may interact with sildenafil: cimetidine Tagamet HB , St. Here are some steps that might help: If you smoke, quit.

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