[Allergic reaction to piperazine. Apropos of 2 cases].
D006801:Humans; D006967:Hypersensitivity; D000077489:Piperazine; D010879:Piperazines / Q000633:toxicity*; D014581:Urticaria / Q000209:etiology*
D010879:Piperazines; D000077489:Piperazine
PIPERAZINES/toxicology; URTICARIA/etiology