Common side effects Common side effects happen in more than 1 in people. If you get these side effects, keep taking the medicine, but tell your doctor or pharmacist if these side effects bother you or do not go away: headaches feeling sick hot flushes, including facial flushing indigestion a colour tinge to your vision or blurred vision stuffy nose dizziness Serious side effects Serious side effects are rare and happen in less than 1 in 1, people. Stop taking sildenafil and call a doctor straight away if you get : chest pains - if this happens during or after sex, get into a semi-sitting position and try to relax; do not use nitrates to treat your chest pain prolonged and sometimes painful erections - if you have an erection that lasts for more than 4 hours, contact a doctor immediately a sudden decrease or loss of vision a serious skin reaction - symptoms may include fever, severe peeling and swelling of the skin, blistering of the mouth, genitals and around the eyes seizures Serious allergic reaction In rare cases, it's possible to have a serious allergic reaction anaphylaxis to sildenafil.
These are not all the side effects of sildenafil. For a full list, see the leaflet inside your medicines packet.
Information: You can report any suspected side effect to the UK safety scheme. Sildenafil is not recommended in pregnancy and while breastfeeding. Non-urgent advice: Tell your doctor if you're:.
Some medicines do not mix well with sildenafil. Tell your doctor if you're taking these medicines before you start sildenafil : nitrates for chest pain riociguat for pulmonary hypertension recreational drugs called poppers, such as amyl nitrite Mixing sildenafil with herbal remedies and supplements Some complementary therapies may have ingredients that could interfere with sildenafil and cause side effects. Important Tell your doctor or pharmacist if you're taking any other medicines, including herbal remedies, vitamins or supplements.
How does sildenafil work? Sildenafil belongs to a group of medicines called phosphodiesterase 5 PDE5 inhibitors. This increases the blood supply to the lungs and reduces the workload of the heart. How well does it work for erection problems? Sildenafil works well for erectile dysfunction.
In general, at least two-thirds of men say they have harder erections after taking it. If sildenafil does not work for you, it may be because: you have not waited long enough after taking it before trying to have sex you have waited too long after taking it to have sex the dose is not high enough you're not sexually aroused enough.
How long does it take to work? Sildenafil usually starts to work within 30 to 60 minutes. It's triggered by sexual stimulation, so you need to be aroused for it to work. How long will it work for? You should be able to get an erection at any time between 1 and 4 hours after taking sildenafil.
Your erection should go away after you have had sex. Can I take it as often as I want? If you're taking sildenafil for erectile dysfunction, do not take it more than once a day. Is it safe to take it for a long time?
Sildenafil is safe to take for a long time. There do not seem to be any lasting harmful effects from taking it for many months and years.
Are there any other medicines that can improve erections? If sildenafil does not work, there are other tablets you could try that work in a similar way, such as: tadalafil Cialis - can be taken up to 36 hours before sex avanafil Spedra - can be taken up to around 4 hours before sex vardenafil Levitra - can be taken up to around 4 hours before sex You could also try a medicine called alprostadil.
Alprostadil comes as: an injection directly into your penis a small pellet placed inside your urethra the tube that carries urine from your bladder to the tip of your penis If you cannot get erections because of a hormonal problem, your GP may refer you to an endocrinologist who specialises in the treatment of hormonal problems.
Are there other treatments for erectile dysfunction? Other treatments for erectile dysfunction include: a vacuum pump psychological treatments penile implants pelvic floor muscle exercises Some complementary therapies, such as acupuncture, have claimed to treat erectile dysfunction. Is there a herbal Viagra? There are lots of treatments that claim to be a "herbal Viagra". Do not take any more doses of sildenafil or similar medications such as tadalafil Cialis or vardenafil Levitra until you talk to your doctor.
There have been reports of heart attack, stroke, irregular heartbeat, bleeding in the brain or lungs, high blood pressure, and sudden death in men who took sildenafil for erectile dysfunction.
Most, but not all, of these people had heart problems before taking sildenafil. It is not known whether these events were caused by sildenafil, sexual activity, heart disease, or a combination of these and other causes. Talk to your doctor about the risks of taking sildenafil. Some patients experienced a sudden decrease or loss of hearing after they took sildenafil or other medications that are similar to sildenafil.
The hearing loss usually involved only one ear and did not always improve when the medication was stopped. It is not known if the hearing loss was caused by the medication. If you experience a sudden loss of hearing, sometimes with ringing in the ears or dizziness, while you are taking sildenafil, call your doctor immediately.
If you are taking sildenafil Viagra for erectile dysfunction, do not take any more doses of sildenafil Viagra or similar medications such as tadalafil Cialis or vardenafil Levitra until you talk to your doctor. If you are taking sildenafil Revatio for PAH, do not stop taking your medication until you talk to your doctor.
Sildenafil may cause other side effects. Call your doctor if you have any unusual problems while you are taking this medication. Keep this medication in the container it came in, tightly closed, and out of reach of children. Store the tablets at room temperature and away from excess heat and moisture not in the bathroom. Store the suspension at room temperature or in a refrigerator, but do not freeze it. Dispose of any unused suspension after 60 days.
It is important to keep all medication out of sight and reach of children as many containers such as weekly pill minders and those for eye drops, creams, patches, and inhalers are not child-resistant and young children can open them easily. To protect young children from poisoning, always lock safety caps and immediately place the medication in a safe location — one that is up and away and out of their sight and reach.
Unneeded medications should be disposed of in special ways to ensure that pets, children, and other people cannot consume them. However, you should not flush this medication down the toilet. Instead, the best way to dispose of your medication is through a medicine take-back program. In case of overdose, call the poison control helpline at If the victim has collapsed, had a seizure, has trouble breathing, or can't be awakened, immediately call emergency services at Do not let anyone else take your medication.
In rare cases, these drugs can cause serious side effects, including sudden loss of vision in one or both eyes or sudden hearing loss. If a person experiences these symptoms, they should stop taking the drug immediately and call their doctor. The other thing a person might consider is the cost and availability of each of these drugs. Some drugs have been around longer and may be more widely available than others.
These may be cheaper than brand-name drugs. Viagra has been available since and is possibly the best-known drug for ED in the world. Its use in the U. Cialis has been on the market since It is widely available and may be a cheaper option than Viagra. Levitra received approval in , and is available in most pharmacies in the U.
There is a generic version, but it is not widely available. Stendra received FDA approval in and is widely available in the U. Cialis is the only drug of the four that has approval for use by people with benign prostatic hyperplasia BPH or enlarged prostate. Cialis also helps to improve urine flow.
A person can take Cialis every day to keep the body ready for sexual stimulation at any time. This allows for some sexual freedom that may be missing with the other options.
Viagra or Levitra may be better for people who do not engage regularly in sexual activity and would rather take one pill each time they plan on having sex. Personal reasons may also guide a choice.
Each body reacts to medications differently. Side effects vary between people, and the potential side effects may help an individual to decide which drug suits them best. Stop taking sildenafil and get emergency medical help if you have: heart attack symptoms --chest pain or pressure, pain spreading to your jaw or shoulder, nausea, sweating; vision changes or sudden vision loss; or erection is painful or lasts longer than 4 hours prolonged erection can damage the penis.
Call your doctor at once if you have: severe shortness of breath, cough with foamy mucus; ringing in your ears, or sudden hearing loss; irregular heartbeat; swelling in your hands, ankles, or feet; a seizure; or convulsions ; or a light-headed feeling, like you might pass out.
Common side effects may include: flushing warmth, redness, or tingly feeling ; headache, dizziness; abnormal vision blurred vision, changes in color vision runny or stuffy nose, nosebleeds; sleep problems insomnia ; muscle pain, back pain; or upset stomach. Drinking alcohol with this medicine can cause side effects. Revatio is usually taken three times each day, about 4 to 6 hours apart. Store at room temperature away from moisture and heat. Since Viagra is used as needed, you are not likely to miss a dose.
If you think you or someone else may have overdosed on: Viagra Sildenafil Injection , call your doctor or the Poison Control center. If someone collapses or isn't breathing after taking Viagra Sildenafil Injection , call What to Expect Viagra usually starts to work within 30 to 60 minutes.
You should be able to achieve an erection between one and four hours after taking Viagra. Your erection should go away after you have sex. Additional Dosage Information Your dosage will depend on your medical condition, your overall health, and other factors. For most men, the recommended dose is 50 milligrams mg , taken as needed. See More. Medical Disclaimer Drugs A-Z provides drug information from Everyday Health and our partners, as well as ratings from our members, all in one place.
The information within all other sections is proprietary to Everyday Health.
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