In terms of outcome, it maybe a tolerable risk, but anything that flat out doubles the risk ratio is fairly concerning; in particular, where the mechanisms are not well understood.
All medications increases the risks of side effects, but they are prescribed because the benifits outweigh the downsides - even if little is known about their mechanism.
> but they are prescribed because the benifits outweigh the downsides
Some are. Some are simply prescribed because the patient asks for them.
> even if little is known about their mechanism.
I wouldn't take it unless my condition was immediately life threatening and there were no other medications available. There are very few classes of treatment that fall within these parameters.