Drug allergy and drug-induced anaphylaxis are more common in adult females compared with males, and this propensity develops after puberty.Although drug-induced anaphylaxis is more prevalent in adult females, fatal or severe drug-induced anaphylaxis is not.Experimental evidence supports sex hormones' roles in the allergic and inflammatory response.Disproportionate utilization of health care, genetic factors related to the X chromosome, epigenetic changes, and discrepant hormonal interactions with immune cells contribute to the sex discrepancy in drug allergy.