Adverse drug reactions (ADRs) are unwanted or harmful effects experienced after the administration of a medication at normal doses. These reactions can range from mild symptoms like nausea and dizziness to severe outcomes such as anaphylaxis, organ damage, or even death. ADRs can occur immediately or develop over time, and they may be caused by various factors including drug interactions, individual sensitivities, and underlying health conditions.It is important to note that all Adverse drug reactions may not be due to allergy but could be due to some other underlying condition.