Chapter 39 Drugs Used in Obstetrics Study Guide Answer Key

Prostaglandins are commonly administered to initiate labor or induce cervical ripening. Misoprostol and dinoprostone are two main medications in this category, with varying onset times and dosages. Misoprostol is often preferred due to its ease of administration, though its use requires careful monitoring due to the risk of uterine hyperstimulation. Dinoprostone is generally given as a gel or insert, providing more controlled release for patients.

Oxytocin remains the most widely used agent for labor induction once cervical ripening is achieved. It is administered intravenously and titrated according to contraction frequency. While it is effective in stimulating uterine contractions, prolonged use can lead to uterine rupture, hyponatremia, or fetal distress if not closely monitored.

Magnesium sulfate is routinely used in cases of preeclampsia to prevent seizures. Dosage is typically initiated intravenously, and blood serum levels are closely tracked. While effective, magnesium sulfate toxicity is a concern and requires vigilant monitoring for signs like loss of deep tendon reflexes, respiratory depression, or hypotension.

Antibiotics are prescribed when there is a risk of infection, especially during labor. Penicillin is often the first choice for group B streptococcus prophylaxis, while cephalosporins and clindamycin are alternatives for patients with allergies. Early administration reduces the risk of neonatal infection and improves outcomes.

Having clear knowledge of these medications and their correct applications is essential for both student learning and clinical practice. Proper understanding of their mechanisms, dosage regimens, and associated risks is fundamental in providing safe care during childbirth.