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What is Viagra?

Viagra is the brand name for sildenafil, a prescription medicine used to treat erectile dysfunction (ED) in men. It works by improving blood flow to the penis, helping to achieve and maintain an erection when combined with sexual stimulation. Viagra is not intended for use in women or children.

It is available in 25 mg, 50 mg, and 100 mg tablets. Since generic sildenafil is widely available, many people look for cheap alternatives or buy it online from licensed U.S. pharmacies. It is important to ensure the product is genuine, with correct labeling, proper strength, and a valid expiration date.

How It Works

Viagra belongs to a class of drugs known as phosphodiesterase type 5 (PDE5) inhibitors. It works by blocking the PDE5 enzyme, which results in higher levels of cyclic GMP in smooth muscle cells. This chemical relaxes blood vessels in the penis, improving blood flow during sexual stimulation and making it easier to get and keep an erection.

Viagra only works in response to sexual stimulation and does not increase sexual desire.

What you may notice

Improved ability to achieve and maintain an erection during sexual activity, usually within 30 to 60 minutes after taking the dose.

Dosage Information

The typical starting dose is 50 mg taken about 1 hour before sexual activity. Based on effectiveness and tolerability, the dose may be decreased to 25 mg or increased to a maximum of 100 mg. Do not take more than once daily.

• Starting dose: 50 mg about 1 hour before sex.
• Lower dose option: 25 mg for those with side effects or certain health conditions.
• Higher dose option: 100 mg for those who need more effect and tolerate the drug well.

How to take it

Swallow the tablet whole with water, with or without food. A high fat meal may delay the onset of effect. Sexual stimulation is required for Viagra to work.

Cost and access tips

Generic sildenafil is less expensive and works the same way as brand name Viagra. Buying from licensed online pharmacies can save money. Cheap pricing is fine when labeling and expiration dates are clear, and a pharmacist is available for questions.

Side Effects

Common side effects include headache, flushing, nasal congestion, indigestion, dizziness, and vision changes (such as a blue tint or blurred vision). These are usually temporary.

Less common but important

• Priapism: An erection lasting more than 4 hours requires urgent medical attention.
• Sudden vision or hearing loss: Stop taking and seek immediate care.
• Low blood pressure: More likely if taking nitrates or certain blood pressure medicines.

Warnings & Interactions

Viagra should not be taken with nitrates (such as nitroglycerin) or guanylate cyclase stimulators (such as riociguat), as the combination can cause a dangerous drop in blood pressure. Use with caution in men with heart disease, recent heart attack or stroke, uncontrolled high or low blood pressure, or severe liver or kidney problems.

Drug interactions

• Nitrates: Dangerous drop in blood pressure when combined.
• Alpha blockers: May cause dizziness or fainting due to low blood pressure.
• Strong CYP3A4 inhibitors: Such as ketoconazole or ritonavir, can increase sildenafil levels.

Practical safety tips

Only take Viagra as prescribed. Seek help if you experience chest pain during sex. If buying online, use licensed U.S. pharmacies, check labeling and expiration dates, and ensure the product is authentic. Cheap pricing is acceptable when those checks are met.