Preparing for the RNC-OB (Inpatient Obstetric Nursing) exam? Pharmacology is one of the areas our deck drills hardest: 110 of its 1050 flashcards focus on pharmacology, covering topics like Magnesium Sulfate, Nitrous Oxide. Try the sample questions below — every card is a real question-and-answer pair from the full deck.
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A patient on Magnesium Sulfate for preeclampsia presents with a respiratory rate of 10 breaths/minute and absent patellar reflexes. What is the priority nursing action and why?
Show answer →Priority: Stop the infusion immediately. Rationale: Absent deep tendon reflexes (DTRs) and bradypnea (RR <12) are definitive signs of magnesium toxicity. DTRs usually disappear at serum levels of 8-10 mEq/L, followed by respiratory depression at 12-15 mEq/L. Exam Tip: NCC often tests the sequence of toxicity; DTR loss almost always precedes respiratory arrest. Notification of the provider and preparation of the antidote follow the immediate cessation of the drug.
An Rh-negative patient at 10 weeks gestation presents with a spontaneous abortion. What is the recommended Rho(D) IG dosage?
Show answer →50 mcg (often branded as MICRhoGAM). Rationale: 50 mcg is sufficient to prevent sensitization for fetomaternal hemorrhage occurring before 13 weeks gestation, as fetal blood volume is minimal. NCC Tip: If 50 mcg is unavailable, the standard 300 mcg dose is acceptable and safe. For any loss or procedure after 13 weeks, the full 300 mcg dose is mandatory.
When is the maximum benefit of antenatal corticosteroids achieved, and how long does this effect typically last before considering a rescue course?
Show answer →Maximum benefit occurs 24 hours after the second dose and lasts for approximately 7 days. If the patient remains at high risk for preterm delivery (<34 weeks) and it has been more than 7–14 days since the initial course, a single rescue course (one 12 mg dose or a full repeat course depending on protocol) may be administered. Exam Tip: Do not give more than two courses total; repeated weekly courses are no longer recommended due to potential concerns regarding decreased birth weight and head circumference.
A nurse is preparing to administer Prepidil (Dinoprostone gel) 0.5 mg endocervically. What is the recommended patient positioning and duration of bedrest following administration?
Show answer →The patient should remain in a supine position with a lateral tilt for at least 30 minutes to 2 hours (per facility protocol/manufacturer) to prevent leakage of the gel from the cervical os. Rationale: Proper positioning ensures maximal contact with the cervix for effective ripening. Exam Tip: Compare this to the Cervidil insert, which also requires 2 hours of recumbent positioning after insertion.
A patient using Nitrous Oxide (N2O) for labor pain complains of feeling dizzy and nauseated after 15 minutes of use. What is the nurse's best response and education point?
Show answer →These are common, dose-dependent side effects. Let's ensure you are only inhaling the gas during the contraction and removing the mask in between. N2O is cleared rapidly (within minutes) via the lungs once inhalation stops. Proper timing is key: the patient should begin inhaling 30 seconds BEFORE the contraction starts to ensure peak effect coincides with peak contraction intensity, then breathe room air between contractions to minimize side effects.
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Try 30 free RNC-OB cards firstThe full RNC-OB deck contains 1050 flashcards, and 110 of them focus on pharmacology. This page shows 5 free samples.
Our RNC-OB deck dedicates 110 of 1050 cards (10%) to pharmacology — always cross-check the official NCC exam outline for the current blueprint weighting.
Yes — the samples on this page are free, and the RNC-OB preview page has 30 more free cards. Full access to all 1050 cards is a one-time $7.
RNC-OB practice test
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RNC-OB study guide
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