“…However, H2‑antihistamines, such as cimetidine, famotidine, and ranitidine, and H1‑antihistamines, such as cetirizine, hydroxyzin, and pheniramine, can themselves induce severe anaphylactic reactions and shock, although rare. Furthermore, corticosteroids, drugs used to treat allergy, paradoxically can also induce anaphylactic reactions . Indeed, in the report of Hill et al .…”