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In critical illness, several drugs and various stressful conditions modify the functions of neurotransmitters which consequently affect the secretion of pituitary hormones. Although the role of neurotransmitters in the regulation of endocrine system is well known, cholinergic actions have been less investigated. In animals, cholinesterase inhibitors were shown to modify the pituitary-thyroid and pituitary-adrenal axes, and to affect prolactin levels. The aim of the present study was to determine the effect of the organophosphate compounds on endocrine system, particularly pituitary hormones. This prospective study was performed in Medical Intensive Care Unit of Erciyes University Medical School Hospital. Twenty-two consecutive patients (ten males and 12 females aged 28+8 years) with organophosphate poisoning were included in …