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• Viagra is a prescription-only medicine used to treat erectile dysfunction (ED) in men.
• ‘Viagra’ is a brand name, the active ingredient is ‘sildenafil’.
• The starting dose is one 50mg tablet in 24 hours. Depending on the results, adjust to 25mg or 100mg.
• Take 30-60 minutes before sexual activity, usually lasts for 4 hours.
• Read the patient leaflet for a full list of side effects, cautions, and interactions with other drugs.
• Large meals, fatty food, alcohol, and grapefruit can affect efficacy.
• The patent expired in 2013 in the US – lower-cost generic sildenafil available.