Final answer:
Side effects are unintended outcomes that can be beneficial, harmful, or neutral, while adverse reactions are unintended and harmful effects that are not predicted. They may range from mild to severe and are less common than side effects.
Step-by-step explanation:
The difference between side effects and adverse reactions lies in their intended outcomes and the harm they may cause. Side effects are generally unintended but may be beneficial, harmful, or neutral. They can be predicted and are commonly associated with a medication or treatment. On the other hand, adverse reactions are unintended and harmful effects that are not expected or predicted. They can range from mild to severe and are generally less common than side effects. Adverse reactions may include allergic reactions, organ damage, or other serious complications.