Viagra has been shown to cause some mild side effects. Talk to your health care provider if these do not go away within a few days. If you begin to experience more serious reactions, seek medical attention immediately.
Common side effects reported from Viagra use include:
More severe side effects include:
If you experience any of these side effects, seek medical attention immediately. These are symptoms of a severe adverse reaction to this medication that require immediate treatment.
As with all prescription medications, inform your doctor of any medical conditions you currently manage. Tell them about any and all medications, prescription drugs, and supplements you are taking before starting treatment with Viagra. Viagra can interact with bodily substances, causing potentially serious adverse reactions.
Specifically, you should inform your health care provider of any nitrate medication you are taking. Remember to mention any herbal products you use, especially St. John’s wort.
In addition, let your doctor know if you have recently had heart surgery or experience chest pain during sex. If you experience any changes in your heartbeat or chest pain during sex, contact your health care provider immediately.
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Consumption of alcohol while taking Viagra is not recommended, as it can increase the likelihood of experiencing side effects.
As with any medication, inform your doctor if you have any changes in your health, such as an increased risk of side effects with increased nitrates, recreational drugs, or if you have ever had a health problem that does not go away. As with all medications, inform your doctor about any and all medications you are taking, including prescription drugs, over the counter drugs, and supplements, since Viagra can interact with these products.
In addition, let your doctor know if you are pregnant or plan to become pregnant. Viagra can pass into breast milk and may harm a nursing baby. If you become pregnant, contact your doctor immediately.
Health officials in South Africa say the popular erectile dysfunction drug Viagra has been linked to cancer and heart attacks.
A Viagra-fueled cancer trial was halted last month after it linked to heart attacks.
In a study conducted by the University of Johannesburg, researchers found that taking Viagra caused heart attacks, strokes and other dangerous side effects, such as dizziness, fainting and heart failure.
“This was the first trial in the country which has linked Viagra to a large number of serious side effects,” study lead author Dr John Smith told.
The trial was stopped at the last minute, but Smith said it was his “largest to date” study to date, and it is his latest to be halted.
Viagra, which is manufactured by Pfizer in the late 1990s, was initially intended for male use, but after an investigation by the drug’s manufacturer, the manufacturer removed its patent from the United States market.
Viagra was prescribed by more than 30 doctors in the United States at the time, but Smith said he was not aware of any deaths associated with the drug.
“The deaths we found were very rare,” Smith said.
“They were fatal, very rare.”
Viagra’s manufacturer, Pfizer, did not immediately return an email request for comment.
The Viagra deaths are the most serious of the drug’s nearly 10,000 years of history, but they are so rare that they can only be described as “rare.”
Although the Viagra study was stopped at the last minute, Smith said he was not aware of any deaths associated with the drug.
He said Viagra, which is manufactured by Pfizer in the late 1990s, was only approved for use in patients over 60 years old.
Although the study was halted at the last minute, the drug’s manufacturer said in a statement: “The safety and efficacy of Viagra have been established in patients with clinically diagnosed cardiovascular disease and has not been reported to our regulatory agencies or patient advocacy groups.”
A Pfizer spokesperson did not immediately return email requests for comment.
The Viagra trials were led by researchers from the University of Johannesburg and the University of Cape Town.
The Viagra trials were stopped at the last minute, but the trial is still ongoing, and Smith said he expected to see a new one next month.
In its ruling on the Viagra trial, the South African Supreme Court ruled that Viagra was not linked to a serious cardiovascular event.
The court also overturned the manufacturer’s claim that the Viagra deaths were rare, with the deaths occurring only in the last year.
Viagra, manufactured by Pfizer, was first approved in the United States in 1998. The drug was then withdrawn from the market in several countries, including South Korea, where it was deemed to be safe.
In 2010, the Food and Drug Administration granted Pfizer permission to manufacture a generic version of Viagra called Sildenafil, which was approved by the FDA in March.
Originally developed by drugmaker Eli Lilly and later marketed by Pfizer, Sildenafil was approved for the treatment of male erectile dysfunction in 1998 by the U. S. Food and Drug Administration.
In 2003, Pfizer withdrew its patent for Viagra from the United States market because of safety concerns, but the drug was still in use.
In 2005, the FDA approved Viagra again, this time in the treatment of erectile dysfunction, but the drug was withdrawn from the market again.
Smith said he was unaware of any deaths related to Viagra.
“The deaths we found were very rare,” he said.
Viagra was initially prescribed to men who were about to be diagnosed with erectile dysfunction, but doctors found it could not be treated.
“They were very rare.”
Viagra is sold as a generic drug, and has been approved for use in South Africa by the Food and Drug Administration.Pfizer has previously denied any connection between the deaths of the patients on the trial and the drug, saying the deaths were “uncommon and possibly fatal.”
The Viagra trial was stopped at the last minute, but the trial is still ongoing, and Smith said he expected to see a new one next month.
A: Viagra 100mg Tablet is primarily used to manage erectile dysfunction (ED) in men by increasing blood flow to the penis, helping men achieve and maintain an erection during sexual activity.
A: No, Viagra 100mg Tablet is a prescription medication and should only be used under the supervision of a healthcare provider. It is essential to consult a doctor to determine the appropriate dosage and ensure safety. Do not self-use Viagra or any ED pills without proper doctor consultation. FDA warns consumers not to use unapproved erectile dysfunction products as they may cause serious side effects like chest pain, fainting, etc.
A: No, Viagra 100mg should not be taken daily. It is typically used on an as-needed basis, with a recommended maximum dose of one tablet per day. Overuse can increase the risk of side effects.
A: Yes, Viagra is an effective for erectile dysfunction (ED) in men. It works by increasing blood flow to the penis, helping men achieve and sustain an erection when sexually stimulated.
A: The best time to take Viagra is approximately 1 hour before sexual activity. However, it can be taken between 30 minutes and 4 hours in advance for optimal effectiveness. Avoid taking it right after a heavy meal, as it may delay its onset.
A: The maximum recommended dose of Viagra is 100mg per day. Do not take more than one dose within a 24-hour period. Always follow your doctor’s recommendations.
A: It is generally not recommended to split a Viagra 100mg tablet unless instructed by your doctor. If a lower dose is required, your doctor may prescribe a 50mg or 25mg dose instead.
A: Viagra can cause a drop in blood pressure, which may be risky for people with certain heart conditions, especially if taken with nitrates or other medications for heart disease. Always consult a doctor before using Viagra if you have a history of heart problems.
A: In rare cases, Viagra has been associated with sudden vision loss due to a condition called non-arteritic anterior ischemic optic neuropathy (NAION). If you experience sudden vision changes or loss, stop taking Viagra and seek immediate medical attention.
A: Viagra can be safe for older adults, but dosage adjustments may be necessary, especially if they have underlying health conditions like heart disease or liver problems. It’s important for older adults to consult their doctor before using Viagra.
A: Common side effects in men taking Viagra 100mg may include headache, flushing, dizziness, blurred vision, and indigestion. If any side effects persist or cause discomfort, consult your doctor.
A: Viagra typically starts working within 30 minutes to 1 hour after ingestion. The exact time may vary depending on factors like food intake, metabolism, and individual response.
A: The effects of Viagra generally last for about 4 to 5 hours. However, the duration may vary depending on the individual, and Viagra will only work with sexual stimulation.
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Sildenafil citrate, commonly known by the brand name, is a prescription-only medicine used to treat erectile dysfunction (ED) in adult men. It works by improving blood flow to the penis, helping to achieve and maintain an erection during sexual activity.
Sildenafil is available in 25mg, 50mg, and 100mg strengths.
Sildenafil has been shown to be effective in up to 80% of men with ED, with effects typically noticeable within 30 to 60 minutes, and lasting for up to 4–5 hours.
Common side effects include:
Less common but serious effects include visual disturbances, hearing changes, or prolonged erections. Seek medical attention if severe or persistent side effects occur.
Sildenafil should not be used by those:
Inform your doctor of all medications and supplements before use. Interactions may occur with:
Avoid excessive alcohol while taking sildenafil, as it can lower blood pressure and increase side effect risk. Use with caution if you have any heart-related conditions.
Sildenafil is available by prescription only in the UK.
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Last updated: 19th May 2025
Sildenafil is a proven medication that treats erectile dysfunction in men. It works by improving blood flow to the penis, helping to achieve and maintain an erection during sexual stimulation.
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