Vidalista 20 mg contains tadalafil, an inhibitor of phosphodiesterase type 5, which relaxes the blood vessels in the penis, improving blood flow and making it easier to obtain an erection. These medicines increase blood flow to specific body areas by relaxing blood vessel muscles. It is best taken as needed, preferably 30 to 60 minutes before indulging in sexual activity. It may last up to 36 hours before engaging in sexual activity. Repeated usage of Vidalista 20 mg can be quite harmful. It is unclear whether Vidalista 20 mg is safe or effective for usage in children under the age of 18. It frequently causes headaches, vertigo, indigestion, nasal congestion, flushing of the cheeks, and vision impairments as side reactions.