Is there much difference between 112 mg of teva-venlafaxine xr and 150 mg? do most side effects ever go away?

There can be: The difference between 112.5 and 150 mg of venlafaxine can make the difference between it being effective or ineffective. I don't know which side effects in particular you are referring to, but the ones that tend not to go away are sweating, erectile dysfunction or difficulty reaching orgasm. Another side effect that does not go away on its own is restless legs syndrome. Stopping this medication suddenly can cause withdrawal. Please consult with your referring physician.