The makers of these brands are not affiliated with and do not endorse Pfizer Inc or its products.

Country Prescription Requirement Over-the-Counter Availability Regulatory Body
USA Yes No FDA
UK Yes No MHRA
Canada Yes No Health Canada
Australia Yes No TGA
India Yes (in some states) Some brands available OTC CDSCO

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How should this medicine be used?

VIAGRA is a prescription medicine used to treat erectile dysfunction (ED). You will not get an erection just by taking this medicine. VIAGRA helps a man with erectile dysfunction get and keep an erection only when he is sexually excited (stimulated). VIAGRA is not for use in women or children. It is not known if VIAGRA is safe and effective in women or children under 18 years of age.

5.8 Effects on Bleeding

take medicines called nitrates (such as nitroglycerin) use street drugs called "poppers" such as amyl nitrate or amyl nitrite, and butyl nitrate take any medicines called guanylate cyclase stimulators such as riociguat (Adempas) are allergic to sildenafil, as contained in VIAGRA and REVATIO, or any of the ingredients in VIAGRA. See the end of this leaflet for a complete list of ingredients in VIAGRA. What should I tell my healthcare provider before taking VIAGRA? Before you take VIAGRA, tell your healthcare provider if you: have or have had heart problems such as a heart attack, irregular heartbeat, angina, chest pain, narrowing of the aortic valve or heart failure have had heart surgery within the last 6 months have low blood pressure, or high blood pressure that is not controlled have had an erection that lasted for more than 4 hours have problems with your blood cells such as sickle cell anemia, multiple myeloma, or leukemia have retinitis pigmentosa, a rare genetic (runs in families) eye disease have ever had severe vision loss, including an eye problem called non-arteritic anterior ischemic optic neuropathy (NAION) have kidney problems or are having kidney dialysis Tell your healthcare provider about all the medicines you take1, including prescription and over-the-counter medicines, vitamins, and herbal supplements. VIAGRA may affect the way other medicines work, and other medicines may affect the way VIAGRA works causing side effects.

Warnings and Precautions

Especially tell your healthcare provider if you take any of the following: medicines called nitrates (see "What is the most important information I should know about VIAGRA?") medicines called guanylate cyclase stimulators, such as riociguat (Adempas) medicines called alpha blockers such as Hytrin (terazosin HCl), Flomax (tamsulosin HCl), Cardura (doxazosin mesylate), Minipress (prazosin HCl), Uroxatral (alfuzosin HCl), Jalyn (dutasteride and tamsulosin HCl), or Rapaflo (silodosin). Alpha-blockers are sometimes prescribed for prostate problems or high blood pressure. 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 VIAGRA contains sildenafil, which is the same medicine found in another drug called REVATIO. REVATIO is used to treat a rare disease called pulmonary arterial hypertension (PAH). ProductsMedical Supplies Products & Devices Learn about our portfolio of products Drug Approval End-to-end warehousing, distribution, and fulfillment solutions Product Search End-to-end warehousing, distribution, and fulfillment solutions Drug Approval End-to-end warehousing, distribution, and fulfillment solutions

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8.6 Patients with Hepatic Impairment

The most common side effects of VIAGRA are: abnormal vision, such as changes in color vision (such as having a blue color tinge) and blurred vision In addition, heart attack, stroke, irregular heartbeats and death have happened rarely in men taking VIAGRA. Most, but not all, of these men had heart problems before taking VIAGRA. It is not known if VIAGRA caused these problems. These are not all the possible side effects of VIAGRA. For more information, ask your healthcare provider or pharmacist.

8.7 Hepatic Impairment

You may report side effects to FDA at 1-800-FDA-1088. Store VIAGRA at room temperature between 68°F to 77°F (20°C to 25°C). Keep VIAGRA and all medicines out of the reach of children. General information about the safe and effective use of VIAGRA. Medicines are sometimes prescribed for purposes other than those listed in a Patient Information leaflet. overviews for every drug Programs Expanded Access Program Supply Chain Logistics Quality Assurance Quality Control Contact Login Sign up Search Our Product Library Browse over 120,000 articles to find the exact drug you are looking for.

5.3 Epistaxis

Do not use VIAGRA for a condition for which it was not prescribed. Do not give VIAGRA to other people, even if they have the same symptoms that you have. This Patient Information leaflet summarizes the most important information about VIAGRA. If you would like more information, talk with your healthcare provider. You can ask your healthcare provider or pharmacist for information about VIAGRA that is written for health professionals. Sildenafil is a treatment for erectile dysfunction.

Drug Class Interaction Effect Recommendation
Nitrates Severe hypotension Avoid combination
Alpha-blockers Additive blood pressure lowering effect Use with caution
CYP3A4 inhibitors (e.g., ketoconazole) Increased sildenafil levels Dose adjustment may be necessary
Antihypertensives Enhanced blood pressure reduction Monitor blood pressure
Grapefruit juice Increased plasma concentration Avoid during treatment

It works by increasing blood flow to your penis.

8.5 Geriatric Use

VIAGRA should not be used with REVATIO or with other PAH treatments containing sildenafil or any other PDE5 inhibitors (such as Adcirca [tadalafil]). Ask your healthcare provider or pharmacist for a list of these medicines, if you are not sure. Take VIAGRA exactly as your healthcare provider tells you to take it. Your healthcare provider will tell you how much VIAGRA to take and when to take it. Take VIAGRA about 1 hour before sexual activity.

How is sildenafil supplied (dosage forms)?

You may take VIAGRA between 30 minutes to 4 hours before sexual activity if needed. VIAGRA can be taken with or without food. If you take VIAGRA after a high fat meal (such as a cheeseburger and french fries), VIAGRA may take a little longer to start working Do not take VIAGRA more than 1 time a day. If you accidentally take too much VIAGRA, call your doctor or go to the nearest hospital emergency room right away. What are the possible side effects of VIAGRA?

How sildenafil is used

an erection that will sildenafil 100 mg tab not go away (priapism). sudden vision loss in one or both eyes. It is uncertain whether PDE5 inhibitors directly cause the vision loss. Stop taking VIAGRA and call your healthcare provider right away if you have sudden vision loss in one or both eyes. If you have these symptoms, stop taking VIAGRA and contact a doctor right away. The brand name for this medication is Viagra®. Cleveland Clinic is a non-profit academic medical center.

Related/similar drugs

Physicians should warn patients that prolonged erections greater than 4 hours and priapism (painful erections greater than 6 hours in duration) have been reported infrequently since market approval of VIAGRA. If priapism is not treated immediately, penile tissue damage and permanent loss of potency may result [see Warnings and Precautions (5.2)]. Physicians should inform patients not to take VIAGRA with other PDE5 inhibitors including REVATIO or other pulmonary arterial hypertension (PAH) treatments containing sildenafil. Sildenafil is also marketed as REVATIO for the treatment of PAH. The safety and efficacy of VIAGRA with other PDE5 inhibitors, including REVATIO, have not been studied [see Warnings and Precautions (5.7)].

This medication requires a prescription.

Counseling of patients about the protective measures necessary to guard against sexually transmitted diseases, including the Human Immunodeficiency Virus (HIV), may be considered [see Warnings and Precautions (5.9)]. What is the most important information I should know about VIAGRA? VIAGRA can cause your blood pressure to drop suddenly to an unsafe level if it is taken with certain other medicines. Do not take VIAGRA if you take any other medicines called "nitrates." Nitrates are used to treat chest pain (angina). A sudden drop in blood pressure can cause you to feel dizzy, faint, or have a heart attack or stroke.

Sildenafil side effects

Do not take VIAGRA if you take medicines called guanylate cyclase stimulators which include: Riociguat (Adempas®) a medicine that treats pulmonary arterial hypertension and chronic-thromboembolic pulmonary hypertension. Tell all your healthcare providers that you take VIAGRA. If you need emergency medical care for a heart problem, it will be important for your healthcare provider to know when you last took VIAGRA. Ask your doctor if your heart is healthy enough to handle the extra strain of having sex. VIAGRA does not protect you or your partner from getting sexually transmitted diseases, including HIV—the virus that causes AIDS. Advertising on our site helps support our mission.

  • 20mg sildenafil is a standard starting dose for many men.
  • Its safety profile is well-established when used responsibly.
  • The drug should be taken at least 30 minutes before sexual activity.
  • Use caution if you experience dizziness or sudden vision loss.
  • Always follow medical advice when using sildenafil for ED.

We do not endorse non-Cleveland Clinic products or services.

  • Sildenafil may be less effective in men with certain health conditions like diabetes.
  • Be aware of potential vision changes, such as blue-tinted vision.
  • Discontinue use and consult a doctor if adverse reactions occur.
  • Sildenafil can cause priapism, a painful prolonged erection needing urgent care.
  • Safe sexual activity depends on your overall cardiovascular health.

SILDENAFIL (sil DEN a fil) treats erectile dysfunction (ED).

Brand Name Company Formulation Type Price Range
Viagra Pfizer Tablet $10–$25 per pill
Kamagra Ajanta Pharma Generic $2–$7 per pill
Sildenafil RX Various pharmacies Various generics $3–$9 per pill
Revatio Pfizer (for pulmonary hypertension) Same strength, different use Varies

It works by increasing blood flow to the penis, which helps to maintain an erection.

5.7 Priapism

For more information, go to or call 1-888-4VIAGRA Inactive ingredients: microcrystalline cellulose, anhydrous dibasic calcium phosphate, croscarmellose sodium, magnesium stearate, hypromellose, titanium dioxide, lactose, triacetin, and FD & C Blue #2 aluminum lake This Patient Information has been approved by the U.S. Food and Drug Administration. This product's label may have been updated. For current full prescribing information, please visit Viagra (sildenafil citrate), Revatio (sildenafil), Cardura (doxazosin mesylate), and Minipress (prazosin HCl) are registered trademarks of Pfizer Inc. The other brands listed are trademarks of their respective owners and are not trademarks of Pfizer Inc.