Is lisinopril safe to use for blood pressure control during pregnancy?

Lisinopril is Absolutely Contraindicated in Pregnancy

No, lisinopril is NOT safe to use for blood pressure control during pregnancy and must be discontinued immediately if pregnancy is detected. 1

Why Lisinopril is Contraindicated

Lisinopril is an ACE inhibitor that carries a Pregnancy Category D designation from the FDA, meaning there is positive evidence of human fetal risk 1. The mechanism of harm is clear:

• Second and third trimester exposure reduces fetal renal function and increases fetal and neonatal morbidity and death
• Oligohydramnios (low amniotic fluid) can develop, leading to:
  • Fetal lung hypoplasia
  • Skeletal deformations
  • Skull hypoplasia
• Neonatal complications include:
  • Anuria (no urine output)
  • Hypotension
  • Renal failure
  • Death

The FDA label explicitly states: "When pregnancy is detected, discontinue lisinopril as soon as possible" 1.

What the Guidelines Say

The most recent 2025 Circulation guidelines are unequivocal: ACE inhibitors, angiotensin II receptor blockers, mineralocorticoid receptor antagonists, and direct renin inhibitors are contraindicated in pregnancy due to their associations with fetal teratogenicity and oligohydramnios 2. This is echoed by the 2020 European Heart Journal position paper 3.

Safe Alternatives for Blood Pressure Control in Pregnancy

First-line agents that should be used instead 2:

1. Extended-release nifedipine (long-acting calcium channel blocker)

   • Often selected as initial treatment due to once-daily dosing
   • Improves adherence
   • Side effects: headaches, tachycardia, edema

2. Labetalol (alpha-1 and non-selective beta-blocker)

   • Reasonable alternative or can be combined with nifedipine
   • May require TID or QID dosing due to accelerated metabolism in pregnancy
   • Contraindicated in reactive airway disease
   • Minimal risks: potential fetal growth restriction, fetal bradycardia, hypoglycemia (but no teratogenicity)

3. Methyldopa (alpha-2 agonist)

   • Only medication with long-term infant outcome data
   • More poorly tolerated (peripheral edema, dry mouth, lightheadedness, drowsiness, mood effects)
   • Common in low- and middle-income countries

There is no compelling data supporting one of these agents over the other 2, and beta-blockers and calcium channel blockers are more effective than methyldopa for preventing severe hypertension 2.

Critical Clinical Pitfall

Even first trimester exposure to ACE inhibitors, while previously thought safer, should be avoided. The evidence shows ACE inhibitors should not be used "beyond the end of the first trimester" 4, and some sources recommend avoiding them entirely during pregnancy 5. The safest approach is to switch to pregnancy-safe alternatives before conception or immediately upon pregnancy detection.

What to Tell Your Patient

Female patients of childbearing age taking lisinopril must be counseled about:

• The consequences of exposure during pregnancy
• The need to report pregnancies immediately
• Treatment options if planning to become pregnant 1

The patient should be switched to nifedipine extended-release or labetalol immediately if she is pregnant or planning pregnancy.