Viagra typically starts working within 30-60 minutes. Effects can last up to 4 hours.

Common side effects include headaches, flushing, and nasal congestion. Consult your doctor if you experience severe reactions.

An overdose can lead to serious heart problems, low blood pressure, and prolonged erections. Seek immediate medical help.

Generic versions contain the same active ingredient (sildenafil) but are available at a lower cost.

It's crucial to consult your healthcare provider to determine the correct dosage based on your health condition and other medications.