If a drug you took four years ago may have given you liver damage, why didn't the FDA tell you then? Why didn't the FDA recall the drug or better yet, not approve it in the first place?
Have you ever noticed how warnings about dangerous prescription drugs always seem to surface after the drug is no longer marketed and its patent has run out? Whether it's an FDA advisory or a trial lawyer solicitation about harm that may have been done to you, the warnings are always belated and useless.