Do not use more of it and do not use it more often than your doctor ordered. How should this medicine be used? Also, the number of doses you take each day, the time allowed between doses, and the length of time you take the medicine depend on the medical problem for which you are using the medicine. Most online providers require a picture of a valid ID, a selfie showing your face, and a recent blood pressure reading taken with a home blood pressure monitor or by a medical provider. Keep from freezing. It’s available in 25 mg, 50 mg, and mg tablets and lasts up to 18 hours. Tell your doctor or pharmacist if you are taking nitrates medications for chest pain such as isosorbide dinitrate Isordil , isosorbide mononitrate Monoket , and nitroglycerin Nitromist, Nitro-Dur, Nitrostat.Key takeaways: Sildenafil (Viagra) is a medication commonly used to treat erectile dysfunction (ED). It’s also available under the brand name Revatio for pulmonary hypertension. Sildenafil interacts with medications that lower blood pressure, like nitrates. It also interacts with alcohol and grapefruit juice. Sildenafil (Revatio) is used to treat pulmonary arterial hypertension (PAH) in children and adults. It improves your ability to exercise and can help prevent PAH from getting worse. Reviewed by: Aileen Chu, PharmD, BCPS. Christina Aungst, PharmD. Save with GoodRx. GoodRx can help you save over 80% off the average retail price of the generic versions. Generic sildenafil at certain pharmacies is as low as $ with a free GoodRx discount. You can also find generic tadalafil and vardenafil for as low as $ and $ , respectively.

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