An adverse reaction is a negative health effect as a reaction to a substance or action. Typically it refers to a drug side-effect, allergic reaction, or overdose/toxicity. An adverse reaction may occur in response to a medication, drug ... More »
- Medication side-effect: Many medications can have side-effects that are unwanted. For example, a prescription drug might cause nausea or dizziness in ... More on Medication side-effect »
- Allergies: Allergies occur when the immune system responds to a substance. Common examples include dust allergies, pollen allergies (causing hay fever ... More on Allergies »
- Overdose: Overdose is the general term for having too much of a substance. An overdose may relate to alcohol overdose, illicit ... More on Overdose »
- Poisoning: Poisoning, or toxicity, is the general category of poisoning from any type of substance. Poisons may be ingested (eaten), injected ... More on Poisoning »
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