Tadalafil is a selective phosphodiesterase type 5 (PDE5) inhibitor that prevents cGMP degradation, leading to smooth muscle relaxation in vascular tissues. Preclinical research documents its binding interactions with PDE5’s catalytic domain, selectivity over other PDE isoforms, and prolonged half-life compared with related compounds. In animal models, tadalafil enhances nitric oxide–mediated vasodilation, improves endothelial function, and modulates vascular remodeling in cardiovascular and urogenital systems. Mechanistic work also explores off-target effects on PDE11 and implications for skeletal muscle and endocrine tissues in nonclinical settings.

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