Anthony Anderson should shut up about his medical marijuana prescription before he messes up a great thing.

"I went to the doctor for this chronic elbow problem, and he told me he had some chronic medicine that he could prescribe to me that would alleviate the pain. So I went to this holistic doctor and basically got a prescription for wacky tabacky. You go to the pot store, or what they call a Wellness Center. They have everything. They make a marijuana butter."

The mischievous star even shared his medicine with some TV co-stars, explaining, "I was on a show called K-Ville and they heard about my baking goods. So I baked brownies for the whole crew. That's probably why the show didn't come back (was canceled)."

He better hope his "joint pain" doesn't mess up his Law & Order gig. [SP]