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A uterotonic, also known as ecbolic, is an agent used to induce contraction or greater tonicity of the uterus. Uterotonics are used both to induce labor, and to reduce postpartum hemorrhage.

Some uterotonics act as analogues of oxytocin. An oxytocinergic, or oxytocic, means "having to do with oxytocin (OXT)". The Oxytocin Receptor (OXTR) is the binding and activation site of oxytocin.

Some agents may act as indirect oxytocinergics:

Other uterotonics include Methylergonovine and Prostaglandin F2.

A tocolytic acts to oppose uterine contractility. These agents may be oxytocinergic in mechanism. For example, Atosiban works in this way.

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