Final answer:
Hypertension during labor or immediately following delivery has medications prescribed prophylactically to manage blood pressure and prevent complications such as preeclampsia.
Step-by-step explanation:
The condition that has medications prescribed as prophylactic treatment during labor or immediately following delivery is hypertension. During labor, high blood pressure can lead to complications such as preeclampsia, which can be life-threatening for both the mother and baby. Therefore, medications like antihypertensives may be given to manage blood pressure levels. Gestational diabetes typically requires blood sugar monitoring and management during pregnancy, not specifically at labor or post-delivery. Placenta previa is a condition where the placenta covers the cervix and requires careful monitoring and potential surgical intervention, but not prophylactic medication. Oligohydramnios refers to low amniotic fluid and may require different types of interventions to ensure the well-being of the fetus, but not typically prophylactic medication.