These medications contain sildenafil, which is generally safe and effective when prescribed by a doctor. However, they are not safe for everyone, especially those taking nitrates for heart chest pain, or individuals with severe heart or liver conditions. Most side effects are mild and temporary, including headaches, facial flushing, indigestion, nasal congestion, and mild dizziness. Rare but serious side effects like a prolonged erection (priapism) or sudden vision changes require immediate medical attention. To ensure your safety, please consult a healthcare professional before use so they can review your medical history and recommend the appropriate dosage for you.