Yes, many pregnant people can take Rennie for heartburn or indigestion, but it should be used at the recommended dose and not in large, long‑term amounts without medical advice.

Is Rennie safe in pregnancy?

  • UK pregnancy charities and NHS‑aligned guidance list antacids such as Rennie as options for treating heartburn in pregnancy.
  • Product information for Rennie Fruit/Orange states it can be used during pregnancy if taken as instructed and if prolonged use of high doses is avoided.

Important dosing cautions

  • Rennie tablets contain calcium carbonate, so pregnancy leaflets advise sticking to the maximum recommended daily dose on the pack and avoiding prolonged high‑dose use.
  • Because Rennie adds extra calcium, the leaflet advises avoiding excessive milk and dairy at the same time to prevent too much calcium intake.

When to talk to a doctor or midwife

  • Speak to a midwife, GP, or pharmacist if:
    • You need Rennie most days or for many weeks.
    • Heartburn is severe, wakes you at night, or comes with chest pain, vomiting, or weight loss.
  • If simple antacids are not enough, guidelines note that other treatments for reflux (like alginates or, if needed, acid‑suppressing medicines) can be considered in pregnancy under medical supervision.

Simple non‑medicine tips

  • Eat smaller, more frequent meals and avoid lying down straight after eating.
  • Limit very spicy, acidic, or fatty foods and try to sleep with your upper body slightly raised to reduce reflux.

Bottom line: Occasional Rennie, taken exactly as the packet or pharmacist advises, is generally considered safe in pregnancy, but frequent or heavy use should always be checked with your own maternity team.

Information gathered from public forums or data available on the internet and portrayed here.