Vidalista 40 is a medicine that can be used to treat erectile dysfunction (ED) in men. The ingredient that makes it active is tadalafil. The drug belongs to the group of drugs called phosphodiesterase-type inhibitors, which open blood arteries to allow blood to flow to the penis more easily when a person is aroused. The suggested dosage for Vidalista 40mg is one tablet taken orally with water. Chewing is not necessary; the tablet should be swallowed whole. It can take up to 20 to 30 minutes for Vidalista to start working.