ibromyalgia
"There's enough evidence incl to indicate that Guaifenesin does not work at all as Dr. St. Amand proposes. I take it anyways for my fibromyalgia related phlegm. It might have a minor or major relaxant effect in higher doses, which explains the benefits that patients report (including some that suggest it worked instantly) but that's as far as it goes. I took it for many years in a desperate attempt to make it work as suggested and rid myself of every single salicylate with obsession. There was no experiencing of cycling or getting better. I lost a lot of money buying Mucinex long lasting and combining with short-acting, and upped the dose to 3600mg/daily at some point to no avail. I'm giving it a 1 because it is not a fibromyalgia treatment."