“I saw a tshuvah from R Shrirah Gaon saying not to follow the medicinal remedies from Chazal unless you have first researched them since Chazal were not doctors.”
Not only did he write that, but it is now a universally accepted position. If you get sick you need to go to a real doctor and not to a talmid chacham for diagnosis and treatment. Of course, before you do that you need to remember that it is HaShem who is the real healer.