Iatrogenic Cushing's syndrome related to the interaction between oral budesonide with fluvoxamine: a case report.

Summary What is known and objective Budesonide, an oral glucocorticoid indicated for the treatment of Crohn's disease, rarely interferes with the hypothalamic–pituitary–adrenal axis because more than 80% of it is metabolized by cytochrome P450 enzymes. Case summary A 33-year-old female patient diagnosed with Crohn's disease, treated with oral budesonide, was admitted for Cushingoid symptoms and signs. The onset coincided with the use of fluvoxamine, a serotonin reuptake inhibitor and also a potent inhibitor of cytochrome P450 enzymes that presumably led to budesonide accumulation. What is new and conclusion Practitioners should take into consideration the possibility of iatrogenic Cushing's syndrome caused by the association of oral budesonide with a P450 cytochrome inhibitor.