Tadalista 20 mg contains tadalafil, a phosphodiesterase type 5 (PDE5) inhibitor used primarily to treat erectile dysfunction (ED). It works by increasing blood flow to the penis during sexual stimulation, helping achieve and maintain an erection. For on-demand treatment of ED, 20 mg is generally the maximum recommended dose. A healthcare professional may recommend a lower dose depending on age, health conditions, other medicines, and response to treatment. Tadalafil should not be taken more frequently than prescribed.