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WebSep 12,  · The normal dose when starting Viagra is 50 mg, as needed. The maximum dose of Viagra is mg each day. Doses above the maximum dose, such as mg .The following nonprescription or herbal products may interact with sildenafil: cimetidine Tagamet HB , St. Read and follow these instructions carefully before you start using sildenafil and each time you get a refill of your medicine. From Mayo Clinic to your inbox Sign up for free and stay up to date on research advancements, health tips, current health topics, and expertise on managing health. There is a problem with information submitted for this request. If you have certain health conditions or are taking certain medications, your doctor may tell you to take sildenafil less often. In some patients, the use of VIAGRA with alpha-blockers can lead to a drop in blood pressure or to fainting medicines called HIV protease inhibitors, such as ritonavir Norvir , indinavir sulfate Crixivan , saquinavir Fortovase or Invirase , or atazanavir sulfate Reyataz some types of oral antifungal medicines, such as ketoconazole Nizoral and itraconazole Sporanox some types of antibiotics, such as clarithromycin Biaxin , telithromycin Ketek , or erythromycin other medicines that treat high blood pressure other medicines or treatments for ED VIAGRA contains sildenafil, which is the same medicine found in another drug called REVATIO.WebJun 14,  · Still, if your doctor says it’s okay for you to use and you end up paying out-of-pocket, you can still get the generic for a lot less than Viagra. According to price-comparison website WebOct 12,  · mg Like Viagra, certain forms of sildenafil are approved to treat ED in males* ages 18 years and older. For example, sildenafil mg, mg, and mg tablets are approved for this use. WebSep 12,  · The normal dose when starting Viagra is 50 mg, as needed. The maximum dose of Viagra is mg each day. Doses above the maximum dose, such as mg .Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy. What Are the Symptoms of Erectile Dysfunction? You should also call your insurance company to see if they cover erectile dysfunction medications. Tell your doctor if sildenafil is not working well or if you are experiencing side effects. Take sildenafil exactly as directed. Yes, ED pills can cause side effects. However, if it is almost time for the next dose, skip the missed dose and continue your regular dosing schedule.