Reactions to medication was the leading cause of allergy-related sudden deaths in the past decade, according to a new analysis.

Investigators looked at fatal drug-induced allergic reactions, which are particularly high among older people. Out of the nearly 2,500 deaths from an allergy from 1999 to 2010, nearly 59% resulted from a medication that led to anaphylaxis. About half were antibiotics, followed by drugs used in cancer treatment. Less than 7% of deaths were from food allergies.

Results appeared in the Journal of Allergy and Clinical Immunology on Sept. 30.