When administering terbutaline sulfate to stop preterm labor, which primary side effect should be monitored?

When administering terbutaline sulfate to manage preterm labor, a primary side effect that should be monitored is tachycardia and a feeling of nervousness. Terbutaline is a beta-agonist that stimulates the beta-2 adrenergic receptors predominantly in the lungs, leading to bronchodilation, but it also has systemic effects that include increased heart rate. Patients may experience tachycardia due to the drug's vasodilatory effects and stimulation of the sympathetic nervous system, which can be particularly pronounced in sensitive individuals or at higher doses.

The sensation of nervousness or anxiety is also commonly reported and results from this adrenergic stimulation. Being vigilant about these effects is crucial because a rapid heart rate or nervousness could indicate over-medication or intolerability, leading to potential complications for both the mother and fetus.

Other choices, while presenting symptoms that could occur with different medications or conditions, do not specifically align with the expected side effects of terbutaline. Monitoring for tachycardia and nervousness is aligned with the understanding of the medication's action and its physiological impact on the body during treatment for preterm labor.