About Sildenafil

Pronunciation: Sildenafil (sil DEN a fil)
Brand Names (USA): Revatio, Viagra
Brand Names (Canada): ACT‑Sildenafil, Apo‑Sildenafil, GD‑Sildenafil, Jamp‑Sildenafil, M‑Sildenafil, Mint‑Sildenafil, MYL‑Sildenafil, PMS‑Sildenafil, RANSildenafil, ratio‑Sildenafil R, Revatio, Sandoz‑Sildenafil, Teva‑Sildenafil, Viagra

For all uses of this drug:

  • If you have an allergy to sildenafil or any other part of this drug.
  • If you are allergic to any drugs like this one, any other drugs, foods, or other substances. Tell your doctor about the allergy and what signs you had, like rash; hives; itching; shortness of breath; wheezing; cough; swelling of face, lips, tongue, or throat; or any other signs.
  • If you use drugs called “poppers” like amyl nitrite and butyl nitrite.
  • If you are taking any of these drugs: Isosorbide dinitrate, isosorbide mononitrate, nitroglycerin, riociguat, or ritonavir.
  • If you are taking another drug that has the same drug in it.
  • If you are taking or will be taking another drug like this one.


  • If you have been told that you are not healthy enough to have sex.

High pressure in the lungs:

  • If you have a health problem called pulmonary veno-occlusive disease (PVOD).
  • This is not a list of all drugs or health problems that interact with this drug.
  • Tell your doctor and pharmacist about all of your drugs (prescription or OTC, natural products, vitamins) and health problems. You must check to make sure that it is safe for you to take this drug with all of your drugs and health problems. Do not start, stop, or change the dose of any drug without checking with your doctor.

Use this drug as ordered by your doctor. Read all information given to you. Follow all instructions closely.

All oral products:

  • Take with or without food.


  • Take this drug before sex when you were told by your doctor. If you are not sure when to take this drug, talk with your doctor.
  • Do not use more than what your doctor told you to use. Do not use more often or longer than what you were told. Doing any of these things may raise the chance of very bad side effects.

High pressure in the lungs:

  • Keep taking this drug as you have been told by your doctor or other health care provider, even if you feel well.
  • Take this drug at the same time of day.
  • To gain the most benefit, do not miss doses.

Be sure to get your medication from fully licensed, qualified pharmacies and avoid counterfeits.


  • This drug is used on an as needed basis. Do not use more often than told by the doctor.
  • Do not take 2 doses on the same day.

High pressure in the lungs:

  • Take a missed dose as soon as you think about it.
  • If it is close to the time for your next dose, skip the missed dose and go back to your normal time.
  • Do not take 2 doses at the same time or extra doses.
  • It is used to treat erectile dysfunction (ED).
  • It is used to treat high blood pressure in the lungs.
  • It may be given to you for other reasons. Talk with the doctor.