Viagra is the brand name for sildenafil citrate, a medication originalmente developed by Pfizer. It’s used to treat erectile dysfunction (ED). The same active ingredient is also used in a different product (Revatio) for pulmonary arterial hypertension, but Revatio is a separate indication and dosing.
Quick facts
- How it works: Sildenafil is a PDE5 inhibitor that helps relax blood vessels in the penis, increasing blood flow in sexual arousal.
- Typical doses for ED: tablets come in 25 mg, 50 mg, and 100 mg. A common starting dose is 50 mg about 60 minutes before sexual activity, but dosing is individualized (30–60 minutes; effects can last up to 4–6 hours).
- How to take: Take with a full glass of water. A high-fat meal can delay absorption and onset.
- What it doesn’t do: It doesn’t cause an erection without sexual arousal.
Important safety and interactions
- Do not take Viagra if you’re using nitrates (e.g., nitroglycerin) for chest pain or if you’ve had certain heart conditions. Combining nitrates with sildenafil can cause a dangerous drop in blood pressure.
- Caution with alpha-blockers (used for high blood pressure or BPH) and some other medicines; dose adjustments may be needed.
- Common side effects: headaches, flushing, indigestion, nasal congestion, dizziness, or visual changes (a blue-taint or blurred vision). Rare but serious issues include priapism (prolonged erection) and sudden hearing/vision loss.
- Not for everyone: people with severe heart disease, very low blood pressure,recent stroke or heart attack, certain eye diseases, or severe liver/kidney impairment should avoid or discuss carefully with a doctor.
Availability and cost
- Viagra brand is Pfizer’s product, but generic sildenafil is widely available in many markets, usually at lower cost.
- Pricing varies by country, pharmacy, and insurance coverage.
If you want, tell me what you’re specifically curious about (how it works, who should use it, potential interactions with a medication you’re taking, or cost in your area), and I can tailor the info. Also, for personalized dosing and safety, please consult your doctor or a pharmacist.