Tadalafil, the active ingredient in Tadalista Professional, belongs to the group of drugs known as phosphodiesterase type 5 inhibitors and is available in an equivalent strength. It works by helping the penile blood arteries relax, allowing blood to flow into a man's penis during sexual activity. About an hour before the patient intends to have sexual activity, one pill should be taken with a glass of water. Store in an airtight container at room temperature, away from moisture, bright light, kids, and animals. You can follow your doctor's advice and take it with or without food. The recommended time to take the tablet is between 30 and 60 minutes before having sex. Try not to drink alcohol throughout therapy, or only drink it in moderation.