If you are taking sildenafil for PAH, take the missed dose as soon as you remember it. Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. What side effects can this medication cause? Generic versions of sildenafil, vardenafil and tadalafil are available. The following nonprescription or herbal products may interact with sildenafil: cimetidine Tagamet HB , St.Pfizer, the manufacturer of Viagra, offers a program that can help lower the cost of Viagra. For more information and to find out if you’re eligible for support, call or visit the. Viagra comes as an oral tablet in different dosages. Discuss with your doctor what’s an appropriate dose for you. For daily use, Goldstein said, the generic form, sildenafil, comes in mg tablets. Tadalafil (Cialis). This medication is taken with or without food an hour before sex. It works for up to 36 hours. You can take it in a small dose daily or in a larger dose as needed. Avanafil (Stendra). You can take this medicine with or without food 30 minutes before sex, depending on the dose.

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