Sildenafil (Generic Viagra)
Erectile Dysfunction Treatment
Sildenafil (Generic Viagra) is a clinically proven treatment for erectile dysfunction. It works by increasing blood flow to the penis, helping men achieve and maintain an erection during sexual stimulation.
Table of Contents
Sildenafil Product Information
Sildenafil is used to help men who have trouble achieving or maintaining their erection. Its active ingredient, sildenafil citrate, belongs to a group of medications known as phosphodiesterase type 5 (PDE5) inhibitors. Sildenafil helps relax the blood vessels in the penis, which, in the presence of sexual stimulation, allows blood to flow into the penis and helps with achieving or maintaining an erection.
Sildenafil is the generic, unbranded version of Viagra and contains the same active ingredient. It is medically equivalent to Viagra but is available at a significantly lower price, making it an accessible option for many men seeking treatment for erectile dysfunction.
The medication was originally developed by Pfizer and has been available as a generic since the patent expired. It has been extensively studied in clinical trials and has been shown to be effective in approximately 82% of men with erectile dysfunction.
Sildenafil works by inhibiting the enzyme phosphodiesterase type 5 (PDE5), which is responsible for breaking down cyclic guanosine monophosphate (cGMP) in the smooth muscle cells of the penis. When a man is sexually stimulated, nitric oxide is released in the erectile tissue of the penis, which activates the enzyme guanylate cyclase. This enzyme increases levels of cGMP, causing the smooth muscles to relax and allowing blood to flow into the penis, resulting in an erection. By blocking PDE5, sildenafil helps maintain higher levels of cGMP, prolonging the erection.
Take one tablet approximately 30-60 minutes before sexual activity. Swallow the tablet whole with a glass of water. Sildenafil can be taken with or without food, although taking it with a heavy or high-fat meal may delay its effects. Do not take more than one tablet in a 24-hour period. The effects typically last for 4-6 hours.
Sildenafil typically begins to work within 30-60 minutes of taking the tablet. For best results, take it on an empty stomach or after a light meal. The onset of action may be delayed if taken with a heavy meal.
The effects of Sildenafil typically last for 4-6 hours after taking the tablet. During this time, you should find it easier to achieve and maintain an erection when sexually stimulated. The medication does not cause a permanent erection — sexual stimulation is still required.
Sildenafil Quick View
| Active Ingredient | Sildenafil Citrate |
|---|---|
| Manufacturer | Various (Generic) |
| Type | PDE5 Inhibitor |
| Onset | 30-60 minutes |
| Duration | 4-6 hours |
| Food Interaction | May be delayed by heavy meals |
| Alcohol | Limit alcohol consumption |
| Prescription | Prescription required |
Sildenafil Side Effects
Common Side Effects
- Headache
- Flushing
- Indigestion
- Nasal congestion
- Dizziness
- Visual disturbances (blurred vision, blue tinge)
Uncommon Side Effects
- Nausea
- Vomiting
- Skin rash
- Eye pain
- Palpitations
- Tachycardia
Rare Side Effects
- Priapism (prolonged erection lasting more than 4 hours)
- Sudden decrease or loss of hearing
- Sudden decrease or loss of vision
- Severe allergic reaction
Important Warning: If you experience a painful erection lasting more than 4 hours, sudden loss of vision, or sudden loss of hearing, seek immediate medical attention. Do not take Sildenafil if you are taking nitrates or nitric oxide donors, as this combination can cause a dangerous drop in blood pressure.
More Information About Sildenafil
Storage
Store below 30°C in the original packaging. Keep out of reach of children.
Contraindications
Do not take if you are allergic to sildenafil or any of the other ingredients. Do not take if you are using nitrates or nitric oxide donors. Do not take if you have severe heart or liver problems. Do not take if you have recently had a stroke or heart attack. Do not take if you have low blood pressure.
Drug Interactions
Sildenafil may interact with nitrates, alpha-blockers, antifungal medications (ketoconazole, itraconazole), HIV protease inhibitors, and other PDE5 inhibitors. Always inform your doctor of all medications you are taking.
Sildenafil FAQs
Sildenafil is a prescription medication used to treat erectile dysfunction (ED). It is the generic version of Viagra and contains the same active ingredient, sildenafil citrate. It works by increasing blood flow to the penis during sexual stimulation.
Viagra and Sildenafil contain the same active ingredient (sildenafil citrate) and work in exactly the same way. The only difference is that Viagra is the branded version made by Pfizer, while Sildenafil is the generic version, which is typically available at a lower price.
While small amounts of alcohol are unlikely to affect Sildenafil's efficacy, excessive alcohol consumption can reduce the medication's effectiveness and increase the risk of side effects such as dizziness and low blood pressure. It is recommended to limit alcohol intake when using Sildenafil.
Sildenafil is typically taken on an as-needed basis, approximately 30-60 minutes before sexual activity. It should not be taken more than once in a 24-hour period. If you require more frequent use, consult your doctor about alternative treatment options.
Generic Sildenafil is manufactured by several pharmaceutical companies including Teva, Mylan, Accord, and others. All generic versions contain the same active ingredient and meet the same quality standards as the branded Viagra.
Sildenafil is specifically designed to treat erectile dysfunction and is not indicated for premature ejaculation. However, some men report that the confidence gained from improved erections may indirectly help. If you experience premature ejaculation, consult your doctor for appropriate treatment options.
Written and Reviewed by Our Qualified Team
Find out more about our medical content authors and how we ensure the accuracy of our content.
Content last updated: 28 Mar 2026
Sildenafil Reviews
Based on 28,301 reviews
Sildenafil has been a game-changer for me. Works within 30 minutes and the effects last for hours. Very satisfied with the results.
Good results overall. Took about 45 minutes to kick in for me. Minor headache the first time but nothing after that.
Excellent medication. My doctor recommended it and I'm glad I tried it. Completely restored my confidence.
Works well on an empty stomach. I noticed reduced effectiveness after a heavy meal. Overall very happy with it.
Been using Sildenafil for 6 months now. Consistent results every time. The generic version works just as well as branded Viagra.
Decent results but I experienced some facial flushing. Switched to a lower dose and it's much better now.
Absolutely brilliant. Fast-acting and reliable. Would recommend to anyone struggling with ED.
Very effective. Only giving 4 stars because of the slight nasal congestion I get, but the benefits far outweigh this minor side effect.
Leave a Review
Sildenafil Video Guide
How Does It Work?
Research
Read our comprehensive review to understand the medication
Consult Your Doctor
Discuss the medication with your healthcare provider
Get Your Prescription
Obtain a valid prescription from your doctor
