Urticaria

Angiotensin-converting-enzyme (ACE) inhibitors are the leading cause of drug-induced angioedema Angiotensin-converting-enzyme (ACE) inhibitors are responsible for 20%–40% of emergency department visits for angioedema.1 The incidence of ACE inhibitor–induced angioedema is about 0.1%–0.7% in the first 5 years of treatment; symptoms occur within the first month in 10% of cases.1 Risk factors include concomitant use of dipeptidyl peptidase-4 inhibitors (e.g., sitagliptin), mammalian target of rapamycin (mTOR) inhibitors (e.g., sirolimus) and neprilysin inhibitors (e.g., sacubitril) (Appendix 1, available at www.cmaj.ca/lookup/doi/10.1503/ cmaj.202308/tab-related-content).1 Nonsteroidal anti-inflammatory drugs and statins can exacerbate angioedema, and the risk of ACE inhibitor–induced angioedema is fivefold higher in Black people.2