Anaphylactoid reaction after use of intracervical dinoprostone gel.

Anaphylactic-like reaction or anaphylactoid reaction resembles generalized anaphylaxis but is not caused by immunoglobulin E-mediated allergic reaction. This reaction is caused by a non-immunologic mechanism even after first exposure to antigen. Prostaglandin E2 (dinoprostone) gel is commonly used for pre-induction cervical ripening.