Take one tablet with a glass of water approximately 30 to 60 minutes before planned sexual activity. It can be taken with or without food.Frequency: Do not take more than one tablet in a 24-hour period. Adhere to the prescribed frequency to avoid potential side effects.Side Effects:Common: Headache, flushing, nasal congestion, indigestion, and dizziness.Serious: Rare but serious side effects include sudden loss of vision or hearing, prolonged erection (priapism), or severe allergic reactions. Seek immediate medical attention if these occur.