AlternativeLosec / Zoton

Omeprazole / Lansoprazole

Proton pump inhibitor

Third-line pregnancy GORD; first-line for severe symptoms or ulcer.

OralIV (omeprazole)

First-line for

  • Severe/complicated pregnancy GORD
  • Peptic ulcer disease
  • Prophylaxis before general anaesthesia in obstetrics

Mechanism

Irreversibly inhibits H+/K+ ATPase in gastric parietal cells → profound acid suppression.

"PPI = pregnancy proven, potent, prokinetic-friendly"

  • Omeprazole = most data in pregnancy
  • Take 30–60 min before breakfast
  • Long-term ↓ Mg, B12, ↑ fracture risk

Dosing

Omeprazole GORD
20 mg OD × 4–8 weeks
Lansoprazole
30 mg OD
Rapid seq. GA prep
Omeprazole 40 mg PO evening + morning of surgery

Contraindications

  • CautionConcurrent clopidogrel (choose pantoprazole)

Side effects

  • Headache, diarrhoea
  • Long-term: hypomagnesaemia, B12 deficiency, ↑ C. difficile, ↑ hip fracture
  • Interstitial nephritis (rare)

Fetal & maternal notes

  • Most reassuring pregnancy data of any PPI (omeprazole)
  • Compatible with breastfeeding

Key interactions

  • Clopidogrel

    Avoid

    ↓ activation via CYP2C19

  • Methotrexate

    Caution

    ↑ MTX levels

  • Warfarin

    Caution

    ↑ INR

Clinical pearls

  • 💡 Give omeprazole 40 mg PO the night before and morning of elective LSCS in high-risk aspiration cases (BMI, difficult airway)
  • 💡 Try step-down after 8 weeks

Content last reviewed: REPLACE_ME (e.g. 2026-07)

Spotted something out of date? See our disclaimer or use Report an Error above.

For educational use only

Not medical advice. Verify dosing against the BNF and your local trust guidelines before prescribing.