Which drug is administered when a patient is experiencing premature labor?
a. Magnesium sulfate
b. Oxytocin (Pitocin)
c. Levonorgestrel (Mirena)
d. Terbutaline (Brethine)
ANS: D
Terbutaline is a beta-adrenergic receptor stimulant, which acts primarily on the beta2 receptors. Stimulation of beta1 receptors produces uterine relaxation and relaxation of the bronchial and vascular smooth muscle. In higher doses, terbutaline will stimulate the beta1 receptors, which raises heart rate. Magnesium sulfate is given to treat eclampsia. Oxytocin is given to produce uterine contractions. Levonorgestrel is a progestin given for contraception.
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