How do we know when Baclofen has more side effects than benefits?

Thanks for the question. If you have an existing drug allergy, it is usually safe to try a drug from a different class. You should inform your doctor of your existing drug allergies and your doctor will be able to advise you on the appropriate or suitable drug that you can take. If you are taking a drug in the same or similar class, there is often a high risk that you can be allergic to the drug. Do consult your doctor on your specific drug allergies and the drug you would like to take and your doctor can advise you further on this.

Mercury is a toxic heavy metal which is widely dispersed in nature. Most human exposure results from fish consumption or dental amalgam. Human exposure to the vapour of metallic mercury dates back to antiquity but continues today in occupational settings and from dental amalgam. Health risks from methylmercury in edible tissues of fish have been the subject of several large epidemiological investigations and continue to be the subject of intense debate. Mercury is most notable for its neurological effects. Too much mercury can cause numbness, memory issues, anxiety, low mood, and tremors.