Which medication is least likely to be prescribed for a client with severe hypotension managing preterm labor?

In the context of managing preterm labor, nifedipine is a calcium channel blocker that can be used to help reduce uterine contractions. However, it is important to note that it also has the potential to cause hypotension as a side effect by relaxing vascular smooth muscle and decreasing systemic vascular resistance.

In cases of severe hypotension, using nifedipine would not be ideal because it could further lower blood pressure, which poses a risk to both the mother and the fetus. On the other hand, other medications listed, such as terbutaline and magnesium sulfate, are less likely to exacerbate the situation of severe hypotension. Terbutaline, a beta-agonist, is primarily used for its tocolytic effects and can sometimes increase heart rate and blood pressure rather than decrease them. Magnesium sulfate is also frequently used in these situations for its neuroprotective effects and to help relax the smooth muscles without significantly impacting blood pressure in the same way that nifedipine might.

Indomethacin, a non-steroidal anti-inflammatory drug (NSAID), is sometimes used to manage preterm labor but can have gastrointestinal and renal considerations. Nonetheless, it does not significantly impact blood pressure like nifedipine can.

Considering these