Tadagra Prof 20 mg is one of the available strengths of this medication. The dosage prescribed by a healthcare professional may vary based on individual response and medical condition. It is important to follow the recommended dosage and instructions provided by your doctor. Tadagra Prof is typically taken as needed, about 30 minutes before anticipated sexual activity. The effects can last for up to 36 hours, making it one of the longer-lasting options for ED treatment. Sexual stimulation is necessary for the medication to be effective.