How does tadalafil work for hair loss?

Tadalafil, originally developed for prostate health, functions by increasing blood flow, which is also beneficial for the scalp. At doses like 2.5 to 5 milligrams, tadalafil helps maintain hair by improving blood circulation to the hair stem cells niche. This approach is akin to using minoxidil, primarily focusing on stimulating blood flow to preserve and possibly improve hair health, albeit it is not typically used to reverse hair loss 1.