TADABEST Tablets TADABEST contains Tadalafil, a potent and selective inhibitor of cyclic guanosine monophosphate (cGMP)-specific phosphodiesterase type 5 (PDE5). During sexual stimulation, local release of nitric oxide (NO) stimulates guanylate cyclase, increasing intracellular cGMP concentrations within the vascular smooth muscle of the corpus cavernosum. Tadalafil selectively inhibits PDE5, preventing cGMP degradation and leading to smooth muscle relaxation, arterial vasodilation, and engorgement of the erectile tissue to facilitate an erection. Additionally, inhibition of PDE5 in the vascular smooth muscle of the prostate and bladder reduces smooth muscle tone, mitigating urinary symptoms. Tadalafil is characterized by a prolonged therapeutic duration of action (up to 36 hours) due to its extended terminal elimination half-life. TADABEST is indicated for the treatment of erectile dysfunction (ED) and signs and symptoms of benign prostatic hyperplasia (BPH) in adult males.