Tadalista 20 mg belongs to the phosphodiesterase type‑5 (PDE5) inhibitor class of drugs. Here’s what that means: Mechanism: PDE5 inhibitors block the enzyme phosphodiesterase type‑5, which normally breaks down cGMP in the *****. Effect: By preventing cGMP breakdown, these drugs relax smooth muscles and increase blood flow to the ***** during ***** stimulation, helping to achieve and maintain an erection. Other drugs in this class: Sildenafil (Viagra®), Vardenafil (Levitra®), Avanafil (Stendra®). So basically, Tadalista 20 mg is a tadalafil-based PDE5 inhibitor, used exclusively for erectile dysfunction, and it does not directly affect libido or ***** desire. If you want, I can make a quick comparison chart of all PDE5 inhibitors, including Tadalista, showing doses, onset, and duration — that’s super handy for study or reference.