Tag: Delayed side effect

While many adverse drug reactions (ADRs) manifest almost immediately, some delayed adverse drug reactions (DADRs) can emerge months or even years after a drug has been initiated, complicating diagnosis and management. These reactions can range from mild skin rashes to life-threatening conditions involving vital organs.

According to a 2025 analysis, adverse drug events are now projected to be the third leading cause of death in the United States, accounting for over 250,000 deaths annually [1.5.3]. A key part of this issue is understanding: **what is a delayed side effect?**