Tadalafil, the active ingredient in Vidalista 5mg, belongs to the group of drugs known as phosphodiesterase type 5 inhibitors and is present in comparable strength. It works by helping the penile blood arteries relax, allowing blood to flow into a man's penis during sexual activity. Tadalafil or Vidalista 5mg should not be taken more than once per day. 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. It often takes 30 to 60 minutes before engaging in sexual activity, and it can last up to 36 hours.