While less common, the most serious side effects of sildenafil are described below, along with what to do if they happen. 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.

How Often Can You Take Sildenafil in a Day?

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. This sildenafil citrate tables makes it easier to get and keep an erection. For pulmonary arterial hypertension, sildenafil relaxes the blood vessels in the lungs.

What happens with ED?

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). 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).

Who should not take sildenafil?

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 at home. The most common side effects of sildenafil are listed below. These side effects may vary depending on the condition that is being treated. 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 sildenafil spray the penis may occur if priapism is not treated quickly. 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. Sudden hearing loss has been reported after taking sildenafil. 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. Sildenafil may cause a mild and 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.

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You may be at higher risk for this if you take a blood thinner medicine.

Key takeaways

Viagra can be taken with or without food, but if you like to fuel up before sexual activity, try to keep your meal choice light. Eating a large or high fat meal before you take it can delay absorption, meaning it’ll take longer to take effect. If you’re anting it to work right away, eat a lighter meal. You might want to wait a couple of hours to allow enough time for digestion before taking it. Do not take the pill and expect to get an erection right away.

What would happen if I took a larger dose of Viagra than my doctor prescribed — for example, 150 mg or 200 mg?

Plan on giving yourself some time for it to work. You can take it up to 4 hours before having sex, so no need to rush or stress about it. If you like a glass of wine or another alcoholic beverage to unwind before sex, you should be fine. But drinking more than that after taking Viagra could decrease its effectiveness. Moderate to heavy drinking can make it more difficult to get an erection.

Is 20 or 25mg Sildenafil Enough for ED?

Combining it with alcohol can increase this effect. If your blood pressure drops, symptoms like dizziness, lightheadedness, and headache could also decrease effectiveness. Viagra will not work if you are not sexually aroused. If you’re going to take it before then, you’ll need to help it along by getting in the mood. Enjoy something that you find sexually stimulating, such as: engage in foreplay, like kissing or erogenous play Viagra normally starts to work within 30 to 60 minutes but can take as long as 2 hours. 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. Sildenafil should not be taken while you are using certain other medicines. 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. See the Interactions section for more details. 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. Keep sildenafil out of the reach of children.

What happens if I miss a dose?

Below are the most common side effects of Viagra. Speak with your doctor if you experience any of these symptoms for an extended period of time: vision problems, such as blurred vision or a blue hue Though not common, some serious side effects have been reported. Stop taking Viagra and call 911 or your local emergency services, or go to the nearest emergency room, if you experience any of these symptoms: an erection that does not go away (priapism), which can cause permanent damage sudden vision loss in one or both eyes, which may be a sign of a serious condition called nonarteritic anterior ischemic optic neuropathy sudden changes in hearing, including tinnitus, decrease in hearing, or hearing loss chest pain or other signs of a heart problem or stroke, such as shortness of breath, confusion, trouble speaking, or nausea and vomiting signs of a severe allergic reaction, which may include fever, trouble swallowing, skin blisters, or swelling of the face, eyes, or tongue There’s no hard and fast rule here. It really comes down to you and your doctor. In some cases, your doctor may recommend trying it over the course of a few weeks or months.

Lifestyle changes

If you’ve tried it a few times and feel you’ve done your part to make it as effective as possible, let your doctor know. Resist the urge to take Viagra recreationally. Be sure it’s prescribed by a doctor who’s aware of your medical history. Recreational Viagra is a thing, and so is counterfeit Viagra. Both are risky and can lead to much more serious side effects.

Typical dosages

A doctor will prescribe the safest and most effective dose based on your health and needs. When taken as prescribed, Viagra can help you get an erection so you can engage in sexual activity, but don’t expect it to do all the work. Take it as directed and make sure to help it along by being aroused when you use it. If you’re not happy with your results, speak with your doctor about other available treatments. Sildenafil is commonly used for the following conditions. If you keep sildenafil oral liquid in a refrigerator, make sure to keep it away from children who also use the refrigerator. 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.

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If you’re relaxed and sexually aroused, it could take effect sooner. Your age, overall health, and what’s in your stomach when you take it can all affect how long it lasts. Typically, Viagra can last up to 4 hours, but many users say it begins to wear off within 2 or 3 hours. Some have reported it lasting up to 5 hours. In case you’re wondering, you will not have an erection the entire time.

What factors affect how long Viagra lasts?

It just means you’ll be able to get it during that window. Usually, your erection will go away after you ejaculate. Like Viagra, most ED drugs can be taken 30 to 60 minutes before sex. The exception is avanfil (Stendra), which is the fastest-acting ED medication available. It only takes 15 to 30 minutes to kick in, depending on the dose.

Does sildenafil interact with foods or drinks?

When it comes to duration, tadalafil (Cialis) is the longest lasting and works for up to 36 hours. Viagra works by increasing blood flow to the penis so you can get hard enough, long enough to engage in sexual activity. Everyone women sildenafil is different, but it’s definitely possible. Your stamina, natural refractory period, and level of arousal can determine how many times you’ll be able to ejaculate before the medication wears off. Yes, as is the case with all medications. 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.

How long does Viagra last?

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. 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. 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.