Tadfil 20 mg (tadalafil 20 mg) is a legally marketed prescription medicine in India, assuming you're referring to the genuine product from a licensed manufacturer. Indian pharmacy listings identify Tadfil 20 mg as tadalafil and mark it prescription required. 1 1mg +1 India's CDSCO regulates the manufacture, distribution, and sale of medicines under the Drugs and Cosmetics Act and related rules, and tadalafil formulations are included in India's approved-drug records. C CDSCO Online +1 So the important distinction is: Legal medicine: Yes. Prescription-only: Yes; it should be obtained with a valid prescription. 1 1mg Taking it without medical advice: Not recommended, particularly at 20 mg, because tadalafil can interact dangerously with nitrates and some other medicines. If you're asking because you've found Tadfil 20 mg on a particular website, you can give me the website name and I can check whether it appears to be a legitimate pharmacy.