The Collaborative International Dictionary
Pituitrin \Pi*tu"i*trin\, n. (Biol. Chem.) A substance or extract from the pituitary body.
Wikipedia
Pituitrin is a proprietary name for an extract of bovine posterior pituitary hormones (i.e. oxytocin and vasopressin) formerly used in obstetrics and since displaced by purer preparations. It was used for the induction of labor prior to birth and for the treatment of post-partum hemorrhage (from vasopressin's vasoconstrictive properties).
Usage examples of "pituitrin".
These extracts, usually called pituitrin, encouraged the reabsorption of water and therefore diminished the volume of urine.
In addition, as it turned out, pituitrin possesses two more important abilities.
I buttoned my coat, picked up the syringe and the bottle of pituitrin and climbed out of the pen.
Hemorrhage persisted following delivery in spite of hypodermic Pituitrin, intravenous ergotrate, and firm uterine packing.