Viagra is a brand name for a medication called sildenafil, which is primarily used to treat erectile dysfunction (ED) in men. Here's a summary of its key aspects:

Mechanism of Action:

Viagra works by inhibiting an enzyme called phosphodiesterase type 5 (PDE5). This enzyme restricts blood flow to the penis, and by inhibiting it, sildenafil promotes increased blood flow, helping to achieve and maintain an erection in response to sexual stimulation.

Usage:

Indication: It's used for men who have difficulty getting or maintaining an erection.
Administration: Typically taken as a tablet, about 30 minutes to an hour before sexual activity. It can be taken with or without food, but it may take longer to work if consumed with a high-fat meal.
Duration: Its effects usually last for 4 to 6 hours, but it does not cause an erection without sexual stimulation.

Dosage:

Viagra comes in different strengths, including 25 mg, 50 mg, and 100 mg tablets.
A common starting dose is 50 mg, but your doctor may adjust it based on your response and tolerance.
Do not exceed one dose per day.

Precautions:

Should not be used with nitrates (often prescribed for heart conditions) as this can cause a dangerous drop in blood pressure.
It may not be suitable for individuals with certain medical conditions like severe heart or liver problems.

Alternative Names:

Viagra is a brand name, and sildenafil is the generic version. Generic sildenafil is often more affordable while offering the same effectiveness.

Always consult a healthcare provider before using Viagra to ensure it’s appropriate for your health condition.