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[8] Caution is advised in those with cardiovascular disease. [8] Rare but serious side effects include vision problems, hearing loss, and prolonged erection (priapism) that can lead to damage to the penis.

2.2 Use with Food

See the end of this leaflet for a complete list of ingredients in SILDENAFIL CITRATE TABLETS. What should I tell my healthcare provider before taking SILDENAFIL CITRATE TABLETS? Before you take SILDENAFIL CITRATE TABLETS, 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. SILDENAFIL CITRATE TABLETS may affect the way other medicines work, and other medicines may affect the way SILDENAFIL CITRATE TABLETS works causing side effects. 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 SILDENAFIL CITRATE TABLETS?") 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).

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Alpha-blockers are sometimes prescribed for prostate problems or high blood pressure. In some patients, the use of SILDENAFIL CITRATE TABLETS 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 SILDENAFIL CITRATE TABLETS contains sildenafil, which is the same medicine found in another drug called SILDENAFIL TABLETS. SILDENAFIL TABLETS is used to treat a rare disease called pulmonary arterial hypertension (PAH). SILDENAFIL CITRATE TABLETS should not be used with SILDENAFIL TABLETS or with other PAH treatments containing sildenafil or any other PDE5 inhibitors (such as Adcirca [tadalafil]). [8] Sildenafil should not be taken by people on nitric oxide donors such as nitroglycerin, as this may result in a serious drop in blood pressure.

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Sildenafil acts by blocking phosphodiesterase 5 (PDE5), an enzyme that promotes breakdown of cGMP, which regulates blood flow in the penis.

4.2 Hypersensitivity Reactions

[4][8] It is also sometimes used off-label for the treatment of certain symptoms in secondary Raynaud's phenomenon. [9] It is unclear if it is effective for treating sexual dysfunction in females. [8] It can be taken orally (swallowed by mouth), intravenously (injection into a vein), or through the sublingual route (dissolved under the tongue). [8][10] Onset when taken sildenafil citrate tablets 50 mg orally is typically within twenty minutes and lasts for about two hours. Common side effects include headaches, heartburn, and flushed skin. [8] It requires sexual arousal to work, and does not by itself cause or increase sexual arousal.

• The active ingredient, sildenafil citrate, is a white to off-white powder.
• It has a molecular weight of approximately 473.6 g/mol.
• The medication is synthesized through complex chemical processes.
• Pharmaceutical quality control ensures batch consistency.

[8] It also results in dilation of the blood vessels in the lungs.

Brand Name	Manufacturer	Dosage Forms	Price Range (USD)	Available Regions
Viagra	Pfizer	25, 50, 100 mg	30-50 per tablet	Worldwide
Revatio	Pfizer	20 mg tablets	40+ per tablet	Mainly for pulmonary hypertension
Kamagra	Ajanta Pharma	50, 100 mg	0.5-2 per tablet	Asia, Middle East
Generic Sildenafil	Multiple manufacturers	25, 50, 100 mg	0.3-3 per tablet	Global

Pfizer originally discovered the medication in 1989 while looking for a treatment for angina.

8.1 Pregnancy

Ask your healthcare provider or pharmacist for a list of these medicines, if you are not sure. How should I take SILDENAFIL CITRATE TABLETS? Take SILDENAFIL CITRATE TABLETS exactly as your healthcare provider tells you to take it. Your healthcare provider will tell you how much SILDENAFIL CITRATE TABLETS to take sildenafil white and when to take it. Take SILDENAFIL CITRATE TABLETS about 1 hour before sexual activity.

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You may take SILDENAFIL CITRATE TABLETS between 30 minutes to 4 hours before sexual activity if needed. SILDENAFIL CITRATE TABLETS can be taken with or without food. If you take SILDENAFIL CITRATE TABLETS after a high fat meal (such as a cheeseburger and french fries), SILDENAFIL CITRATE TABLETS may take a little longer to start working Do not take SILDENAFIL CITRATE TABLETS more than 1 time a day. If you accidentally take too much SILDENAFIL CITRATE TABLETS, call your doctor or go to the nearest hospital emergency room right away. What are the possible side effects of SILDENAFIL CITRATE TABLETS? [11] It was approved for medical use in the United States and in the European Union in 1998. [5][8][11][12] In 2023, it was the 151st most commonly prescribed medication in the United States, with more than 3 million prescriptions.

UK DOCTORS AND CLINICIANS

If you would like more information, talk with your healthcare provider. You can ask your healthcare provider or pharmacist for information about SILDENAFIL CITRATE TABLETS that is written for health professionals. For more information, go to or call 1-800-438-1985 What are the ingredients in SILDENAFIL CITRATE TABLETS? This Patient Information has been approved by the U.S. Food and Drug Administration.

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This product's label may have been updated. For current full prescribing information, please visit 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. The makers of these brands are not affiliated with and do not endorse Pfizer Inc or its products. All content on this page has been medically reviewed by: Hassan Thwaini, Clinical Pharmacist and Copywriter, Master of Pharmacy (MPharm) on 30 March, 2026. [13][14] It is available as a generic medication. [15][16] In the United Kingdom, it is available as a pharmacy medicine.

Adverse effects

Sildenafil is an effective treatment for erectile dysfunction. It contains the same active ingredient as branded alternatives. Sildenafil works by encouraging more blood to flow to the penis, ensuring a strong erection when you need one. It’s effective for 82% of men.1 Find the clinically proven ED treatment that suits you best. No names, no logos, no delivery fee.

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4.6* from over 33,000 people like you. BSc (Hons) MBBS MRCGP AFHEA MA (Hons) AFMCP “Efficacy and Safety of Sildenafil Citrate for Treatment of Erectile Dysfunction in a Population With Associated Organic Risk Factors.” Journal of Andrology (2013). “Efficacy and Safety of Sildenafil Citrate for Treatment of Erectile Dysfunction in a Population With Associated Organic Risk Factors.” Journal of Andrology (2013). Answer a few simple questions to get the treatment you need. Sildenafil, sold under the brand name Viagra among others, is a medication used to treat erectile dysfunction and pulmonary arterial hypertension. The primary indication of sildenafil is treatment of erectile dysfunction (inability to sustain a satisfactory erection to complete sexual intercourse).

• Common side effects include headaches, flushing, and nasal congestion.
• Serious side effects are rare but may involve vision changes or priapism.
• Alcohol can reduce the effectiveness of sildenafil and increase side effects.
• Keep the medication out of reach of children and store in a cool, dry place.

Its use is now one of the standard treatments for erectile dysfunction, including for males with diabetes mellitus.

Chemical synthesis

SILDENAFIL CITRATE TABLETS can cause serious side effects. an erection that will 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 SILDENAFIL CITRATE TABLETS and call your healthcare provider right away if you have sudden vision loss in one or both eyes.

What are the serious side effects of sildenafil?

If you have these symptoms, stop taking SILDENAFIL CITRATE TABLETS and contact a doctor right away. The most common side effects of SILDENAFIL CITRATE TABLETS 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 SILDENAFIL CITRATE TABLETS. Most, but not all, of these men had heart problems before taking SILDENAFIL CITRATE TABLETS. It is not known if SILDENAFIL CITRATE TABLETS caused these problems. These are not all the possible side effects of SILDENAFIL CITRATE TABLETS. Tentative evidence suggests that sildenafil may help males who experience antidepressant-induced erectile dysfunction. While sildenafil improves some markers of disease in people with pulmonary arterial hypertension, it does not appear to affect the risk of death or serious side effects. Sildenafil and other PDE5 inhibitors are used off-label to alleviate vasospasm and treat severe ischemia and ulcers in fingers and toes for people with secondary Raynaud's phenomenon;[9][21] these drugs have moderate efficacy for reducing the frequency and duration of vasospastic episodes.

Further information

For more information, ask your healthcare provider or pharmacist. You may report side effects to FDA at 1-800-FDA-1088. How should I store SILDENAFIL CITRATE TABLETS? Store SILDENAFIL CITRATE TABLETS at room temperature between 68°F to 77°F (20°C to 25°C). Keep SILDENAFIL CITRATE TABLETS and all medicines out of the reach of children.

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General information about the safe and effective use of SILDENAFIL CITRATE TABLETS. Medicines are sometimes prescribed for purposes other than those listed in a Patient Information leaflet. Do not use SILDENAFIL 20mg sildenafil CITRATE TABLETS for a condition for which it was not prescribed. Do not give SILDENAFIL CITRATE TABLETS to other people, even if they have the same symptoms that you have. This Patient Information leaflet summarizes the most important information about SILDENAFIL CITRATE TABLETS.

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