Tadfil 20 mg is used to treat erectile dysfunction, which is the inability to achieve or maintain an erection firm enough for satisfactory sexual performance. The recommended starting dose of Tadfil 20 mg is one tablet taken orally with a glass of water, approximately 30 minutes to 1 hour before anticipated sexual activity. The dosage may be adjusted based on individual response and tolerability. It’s important to follow your healthcare provider’s instructions regarding dosage and timing.