Which drug is available in an injectable form used to augment labor?

The injectable form of the drug used to augment labor is Pitocin, which is a brand name for oxytocin. This medication is a synthetic form of the hormone oxytocin, which plays a crucial role in promoting contractions during labor. Healthcare providers administer Pitocin intravenously to help stimulate or strengthen uterine contractions when labor is not progressing as expected. This is particularly helpful in situations such as when labor is prolonged or when there is a need for labor induction due to medical conditions affecting the mother or fetus.

While oxytocin and Pitocin refer to the same hormone, Pitocin specifically denotes the pharmaceutical formulation used in medical practice. Therefore, in the context of the question, Pitocin is the correct answer as it directly indicates the injectable form. The other options, while related to pregnancy and labor, do not serve the purpose of augmenting labor in the same manner. Magnesium sulfate is primarily used for seizure prevention in preeclampsia, and estradiol is a form of estrogen used for hormone replacement and other indications, not for labor management.