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In the U.S., you can report side effects to the FDA at or by calling 800-FDA-1088. In Canada, you can report side effects to Health Canada at or by calling 866-234-2345. While less common, the most serious side effects of sildenafil are described below, along with what to do if they happen.

6.1 Clinical Trials Experience

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 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.

Sildenafil: what you need to know

The makers of these brands are not affiliated with and do not endorse Pfizer Inc or its products. Sildenafil is commonly used for the following conditions. Erectile dysfunction, a condition where you have trouble getting or keeping an erection Pulmonary arterial hypertension, a condition where you have high blood pressure in the blood vessels that carry blood from your heart to your lungs Sildenafil may also be used for other conditions as determined by your healthcare provider. Sildenafil works by blocking an enzyme in the body called PDE5, which helps relax certain blood vessels. For erectile dysfunction, it increases blood flow to the penis when aroused. Sildenafil may cause allergic reactions, which can be serious. Stop taking sildenafil and get help right away if you have any of the following symptoms of a serious allergic reaction. Swelling of the face, lips, mouth, tongue, or throat Itching, skin rash, or pale red bumps on the skin called hives Sildenafil may cause an unwanted erection that is persistent, painful, and that may occur without sexual arousal. Permanent damage to the penis may occur if priapism is not treated quickly.

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Stop taking sildenafil and get emergency help if you have any of the following symptoms of priapism. Erection lasting for more than four hours Erection that is unrelated to sexual stimulation Sildenafil can cause mild, temporary vision changes such as seeing a blue tint, abnormal colors, blurry vision, or sensitivity to light. Though rare, some people have reported permanent vision loss. Stop taking sildenafil and get help right away if you have sudden vision loss in one or both eyes.

  • Sildenafil is available in many countries but must be obtained through proper medical channels.
  • Using counterfeit or unregulated versions can pose serious health risks.
  • Always check for proper branding and packaging when purchasing.

Sudden hearing loss has been reported after taking sildenafil.

  • Certain foods and drinks, like high-fat meals or alcohol, may delay sildenafil’s absorption.
  • For best results, take the pill with a light meal or on an empty stomach.
  • Adequate hydration can also support optimal absorption.

This may occur along with dizziness and ringing in the ears. Stop taking sildenafil and get help right away if you have sudden hearing loss or suddenly have trouble hearing as well as usual.

  • The blue pill is part of a class of medications that include tadalafil and vardenafil.
  • Each PDE5 inhibitor has different duration and onset times.
  • Consult a doctor to choose the most appropriate medication.

Sildenafil may cause a mild and sildenafil 20 mg tablets temporary drop in blood pressure. You may be at a higher risk if you have certain health conditions or take blood pressure medicines. If you feel faint or dizzy, lie down. Tell your healthcare provider right away if you have any of the following symptoms of low blood pressure. You may be at higher risk for this if you take a blood thinner medicine. Tell your healthcare provider if you get nosebleeds often while taking sildenafil. If your nosebleed is severe or will not stop after applying pressure, get help right away. People who are allergic to any of the following should not take sildenafil. Any of the ingredients in the specific product dispensed Your pharmacist can tell you all of the ingredients in the specific sildenafil products they stock.

5.8 Effects on Bleeding

Sudden vision loss in one or both eyes can be a sign of a serious eye problem called non-arteritic anterior ischemic optic neuropathy (NAION). Stop taking SILDENAFIL CITRATE TABLETS 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 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.

How does sildenafil work (mechanism of action)?

It is not known if SILDENAFIL CITRATE TABLETS caused these problems. Tell your healthcare provider if you have any side effect that bothers you or does not go away. These are not all the possible side effects of SILDENAFIL CITRATE TABLETS. For more information, ask your healthcare provider or pharmacist. You may report side effects to FDA at 1-800-FDA-1088. Sildenafil should not be taken while you are using certain other medicines.

  • Sildenafil should not be used with nitrate medications due to risk of severe hypotension.
  • Possible side effects include headaches, flushing, nasal congestion, and dizziness.
  • Always consult a healthcare provider before using sildenafil to ensure safety.

Before taking sildenafil, tell your healthcare provider about any prescription or over-the-counter (OTC) medicines, vitamins/minerals, herbal products, and other supplements you are using.

5.2 Prolonged Erection and Priapism

This makes it easier to get and keep an erection. For pulmonary arterial hypertension, sildenafil relaxes the blood vessels in the lungs. This lowers blood pressure and reduces strain on the heart. 10 mg/mL powder for oral suspension 20 mg, 25 mg, 50 mg, 100 mg oral tablets Sildenafil is also available in an injectable form that is usually given by a healthcare provider in a hospital or clinic. Sildenafil oral tablets should be stored at room temperature, between 68 F to 77 F (20 C to 25 C).

Related treatment guides

It can be exposed to temperatures between 59 F to 86 F (15 C to 30 C) for shorter periods of time, such as when transporting it. Sildenafil oral liquid should be stored at room temperature below 86 F (30 C) or in the refrigerator, between 36 F to 46 F (2 C to 8 C). Throw away any remaining liquid 60 days after it has been mixed for you by a pharmacist or healthcare professional. Sildenafil injection is usually given by a healthcare provider in a hospital or clinic. You will not store it sildenafil citrate 100 mg at home. See the Interactions section for more details.

What is the difference between sildenafil and Viagra?

The most common side effects of sildenafil are listed below. These side effects may vary depending on the condition that is being treated. Tell your healthcare provider if you have any of these side effects that bother you. Pain in your muscles, back, arms, or legs There may be other side effects of sildenafil that are not listed here. Contact your healthcare provider if you think you are having a side effect of a medicine. Do not take sildenafil unless it has been prescribed to you by a healthcare provider. Do not share sildenafil with other people, even if they have the same condition as you.

Aspect Details
Prescription Abuse Risk of misuse and dependence
Accessibility Widely available, but under strict regulation
Stigma Some negative perceptions about ED medication use
Education Needed Proper understanding of safe use
Cultural Attitudes Vary by region, influence medication acceptance

Keep sildenafil out of the reach of children. If you keep sildenafil oral liquid in a refrigerator, make sure to keep it away from children who also use the refrigerator.

Risk Explanation
Prolonged Erection (Priapism) Seek urgent medical help if lasts >4 hours
Vision Loss Rare, but requires immediate attention
Drug Interactions Can cause dangerous hypotension if misused
Overdose Symptoms include severe hypotension, dizziness

Sexual activity can put extra strain on your heart, which may be unsafe for people with certain health problems, such as a recent heart attack. Talk to your healthcare provider to see if your heart is strong enough for sex. If you feel chest pain, dizziness, or nausea during sex, stop and contact your healthcare provider right away.

Society and culture

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. 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.

How should I store sildenafil?

Do not use 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. You can ask your healthcare provider or pharmacist 150mg sildenafil for sale 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? Sildenafil does not protect against sexually transmitted infections, including HIV. Sildenafil belongs to a group of medicines, known as phosphodiesterase-5 (PDE-5) inhibitors, which are used to treat erectile dysfunction or pulmonary arterial hypertension. You should not take more than one PDE-5 inhibitor medicine. Medicines in this group include avanafil (Stendra), sildenafil (Viagra, Revatio, and others), tadalafil (Cialis and others), and vardenafil (Levitra, Staxyn). Use an accurate measuring device to measure your dose of sildenafil oral liquid. A household spoon is not an accurate measuring device and may cause you to take the wrong dose. Ask your pharmacist to recommend an appropriate measuring device. Tell your healthcare provider about all of your health conditions and any prescription or over-the-counter (OTC) medicines, vitamins/minerals, herbal products, and other supplements you are using.

Stronger erections, better sex

Take SILDENAFIL CITRATE TABLETS about 1 hour before sexual activity. 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.

Marketing and sales

What are the possible side effects of SILDENAFIL CITRATE TABLETS? SILDENAFIL CITRATE TABLETS can cause serious side effects. an erection that will not go away (priapism). If you have an erection that lasts more than 4 hours, get medical help right away. sudden vision loss in one or both eyes. This will help them determine if sildenafil is right for you. In particular, make sure that you discuss any of the following. Tell your healthcare provider if you have any of the following. Heart problems, such as heart rhythm problems, chest pain, or heart failure Heart attack, stroke, or heart surgery within the past six months High blood pressure that is still too high despite taking medicines for it Peyronie's disease, or a penis with an abnormal curve or shape An erection lasting longer than four hours A blood disorder, such as sickle cell anemia An inherited eye disease called retinitis pigmentosa Vision loss, or a problem with the nerve between your eyes and brain (optic nerve) Health conditions or factors that raise the risk of optic nerve problems, such as diabetes, high cholesterol, smoking, being older than 50, or having a “crowded disc,” which is something an eye doctor may see in an eye exam Pulmonary veno-occlusive disease, a condition where blood vessels in the lungs are blocked It is not known if or how sildenafil could affect pregnancy or harm an unborn baby.