CHANGE: The Race To Replace Viagra.

Interestingly, they’re looking at it as a treatment for Cystic Fibrosis: “Phosphodiesterase type 5 (PDE5) inhibitors reduce inflammation, improve vascular health, increase microvascular O2 delivery and improve skeletal muscle function. Accordingly, our central hypothesis is that treatment with the PDE5 inhibitor, sildenafil, can improve exercise capacity, vascular and cardiac function, and overall quality of life, all of which may contribute to improvement in exercise tolerance in people with CF.”