@ajayb I had similar pain. I read in the studies that it is often worse when you take close to a time when you'll be resting and not moving much.

I switched to taking it first thing in the morning and that did the trick for me. Never had pain after making the switch in time. I also think that my body acclimated.

Good luck and solving the issue. Docs can also prescribe regular Viagra instead of the Tadalafil.