Which of the following is considered the safest antihypertensive drug in pregnancy induced hypertension (PIH)?

RML PRE 2025

Pharmacology

Easy

Appeared in: RML PRE 2025

Explanation

Methyldopa and Labetalol are the first-line therapeutic agents for managing hypertension during pregnancy due to their established safety and efficacy.
Methyldopa, a centrally-acting alpha-2 adrenergic agonist, has the longest and most extensive safety record for use in pregnancy.
Labetalol, a combined alpha- and beta-adrenergic blocker, is also widely used. It effectively lowers maternal blood pressure without negatively impacting blood flow to the uterus and placenta, which is critical for fetal health.

Option A: ACE inhibitors are strictly contraindicated during all trimesters of pregnancy because they are teratogenic.
Option C: Atenolol, a beta-blocker, is not recommended for use in pregnancy as it has been strongly linked to fetal (intrauterine) growth restriction.
Option D: Sodium Nitroprusside is a potent vasodilator that is generally avoided in pregnancy due to the significant risk of fetal cyanide poisoning.

Clinical Relevance

Nursing practice connection: Knowing Pharmacological management of pregnancy-induced hypertension (PIH) helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Effective management of PIH is critical to prevent severe maternal complications such as eclampsia, stroke, and placental abruption, as well as fetal complications like growth restriction and intrauterine demise.
Nurses are central to care, responsible for frequent blood pressure monitoring, assessing for signs of disease progression (e.g., headache, visual changes, epigastric pain), administering medications safely, and providing patient education.
What if? If the patient presented with a hypertensive emergency (e.g., BP consistently greater than 160/110 mmHg), the treatment would shift to urgent administration of intravenous agents like labetalol or hydralazine to prevent maternal stroke.

How to Approach the Question

Identify the key clinical context from the question stem: the patient is pregnant and has hypertension (PIH). The keyword is "safest."
Recall the major classes of antihypertensive drugs and their safety profiles in pregnancy.
Eliminate options that are known to be harmful. ACE inhibitors are a classic example of drugs that are teratogenic and absolutely contraindicated in pregnancy.
Eliminate drugs that are reserved for emergencies or have significant fetal risks. Sodium Nitroprusside is used for hypertensive crises but carries a risk of cyanide toxicity for the fetus.
Differentiate between drugs within the same class. While beta-blockers are used, Atenolol is specifically associated with fetal growth restriction, making it less safe than Labetalol.
Identify the drugs with the best-established safety record. Methyldopa and Labetalol are recognized as the first-line, safest options for routine management of hypertension in pregnancy.

Concept Tested & Keywords

Concept Tested: Pharmacological management of pregnancy-induced hypertension (PIH)
Stem keywords: safest antihypertensive drug, pregnancy induced hypertension, PIH
Lead-in keywords: safest
Negative lead-in flag: false

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