What is Viagra? Uses, warnings & side effects

Before taking Viagra, carefully read the prescription label and patient information leaflet. Ask your healthcare provider or pharmacist if you have any questions.

Your doctor will tell you how much medicine to use. Do not use more than directed.

For erectile dysfunction: Take this medicine about 1 hour before you have sex. Do not take it more than once a day. Always allow at least 24 hours between doses. Viagra only works in combination with sexual stimulation. You will not have an erection just by taking a tablet.

Store the medicine at room temperature, away from heat, moisture, and direct light. Keep out of reach and out of sight of children and pets. Keep the bottle tightly closed when not in use. Do not share your medication with anyone.

While taking Viagra, avoid alcohol and grapefruit juice. Also, do not take other medications that treat ED.

Viagra is only taken once as needed. There is no dosing schedule.

This medicine is not right for everyone. Do not use it if you have had an allergic reaction to sildenafil, Viagra, Revatio, or any ingredients in the medication.

Do not take Viagra if you are taking a nitrate drug such as nitroglycerin tablets or isosorbide mononitrate.

People who are taking a guanylate cyclase stimulator, such as Adempas (riociguat) or Verquvo (vericiguat), should not take Viagra.

Tell your doctor if you are pregnant or breastfeeding, or if you have kidney problems, liver disease, bleeding conditions, eye or vision problems, a history of medical conditions of the penis, any type of blood pressure or heart problems, stomach bleeding, or blood diseases like sickle cell anemia or leukemia. Also, tell your doctor if you smoke.

Tell any doctor who treats you that you take sildenafil.

This medicine may cause the following problems:

• Low blood pressure (especially if taken with other medicines that lower blood pressure) and fainting

• Heart problems: if during sexual activity, you become dizzy or nauseous, or have pain or numbness in the chest, arms, neck, or jaw, stop immediately and get emergency medical help.

• Painful or prolonged erection (seek emergency medical help if an erection lasts more than 4 hours)

• Sudden vision loss or hearing problems, which require emergency medical care

Keep all medicine out of the reach of children. Never share your medicine with anyone.

Before taking Viagra, tell your healthcare provider about all the medications you take, including prescription and nonprescription drugs, vitamins, and dietary supplements.

Avoid alcohol and grapefruit juice while taking Viagra.

Do not use this medicine if you also use Adempas (riociguat), Verquvo (vericiguat), or nitrate medicine. 

While taking Viagra, do not take other medicines that contain sildenafil—or similar ED medicines, such as Cialis (tadalafil) or Levitra (vardenafil).

Some medicines can affect how sildenafil works. Tell your doctor if you are using any of the following: amlodipine, atazanavir, bosentan, cimetidine, erythromycin, itraconazole, ketoconazole, rifampin, ritonavir, saquinavir, or medicine for prostate problems or high blood pressure (including alfuzosin, doxazosin, prazosin, silodosin, tamsulosin, terazosin).