Tadalafil is used off-label for which condition?

• A. Pulmonary Hypertension
• B. Erectile Dysfunction
• C. Hypertension
• D. Panic Disorder

Answer: (A)

Tadalafil is a PDE5 inhibitor, which means it blocks the breakdown of cyclic GMP (cGMP) in smooth muscle. Increased cGMP enhances nitric oxide–mediated vasodilation, leading to relaxation of vascular smooth muscle. In the lungs, this effect lowers pulmonary vascular resistance and reduces the workload on the right heart, improving symptoms and exercise capacity in pulmonary arterial hypertension. Among the options, this mechanism directly addresses a condition characterized by constricted pulmonary arteries, making pulmonary hypertension the best fit. The other conditions either involve systemic blood pressure changes that tadalafil isn’t used to treat, or are unrelated to the drug’s vasodilatory mechanism; erectile dysfunction is the primary indication, not off-label use for a vascular disease in the lungs.