Adverse drug reactions (ADRs), side effects, and allergic reactions to drugs may all seem like similar terms, but they mean a variety of different things. An ADR is an unwelcomed and unwanted reaction to a drug that can be caused by an allergic reaction or for another reason. A side effect, on the other hand, is a reaction to a drug that in most cases is positive. To help keep people informed about potential risks associated with different pharmaceuticals, countries like Canada have systems for reporting the occurrence of ADRs. As you may notice during your career, some ADRs seem.. READ MORE »