Gold Coin Grass and Chanca piedra are stone crushers. I took 1 TBSP every morning on an empty stomach 30 minutes before breakfast for a week. I did several rounds of it because I was targeting any possible pancreatic or kidney stones or stones in my other organs. I might have had a pancreatic stone pass. My pancreas was a mess when I started the program. It is entirely possible judging by some of my symptoms.
I don't believe GCG will affect the drugs you are trying to get off of, but I don't have any specs on it.
I discovered also there was quite a lot of stuff to take if you are doing replacement therapy with the drug withdrawal along with this program.
I was off the drugs for a few years before I started this program.