You can usually take Rennies several times a day, but you must stay within the daily maximum on the pack and only use them short term.

Safe dosing in plain language

For standard Rennie Peppermint/Regular chewable tablets (adults and over 12):

  • Typical dose:
    • 1–2 tablets at a time, as needed for indigestion or heartburn.
  • How often:
    • Often suggested around 1 hour after meals and before bed; you can take extra doses in between if symptoms flare, as long as you stay under the daily limit.
  • Maximum per day:
    • Most leaflets say do not exceed 10–11 tablets in 24 hours (check your exact pack: some say 10, some 11).
  • How many days in a row:
    • Short‑term only. Some official leaflets say no more than about 7–14 days of continuous use without seeing a doctor or pharmacist (wording varies slightly by country/pack).

So in practice, you can take Rennies several times spread through the day, but you should:

  • Take 1–2 tablets per “dose”
  • Leave a gap between doses (e.g. only when symptoms return, typically around mealtimes/bedtime)
  • Not go over the total daily maximum on your specific packet
  • Not keep using them day after day for longer than 1–2 weeks without medical advice

When to be extra careful

You should talk to a doctor or pharmacist before using Rennies or using them often if:

  • You have kidney problems, are on a low‑phosphate diet, or high blood calcium has ever been an issue
  • You take lots of other medicines (Rennies can affect absorption of some drugs if taken at the same time)
  • You are pregnant and need them frequently; they are usually allowed but you should strictly stick to the maximum dose and avoid a lot of extra milk/dairy

Also:

  • Do not take more than one Rennie product at once (e.g. Rennie Peppermint plus Rennie Dual Action together).
  • Avoid taking them at the same time as other tablets where possible; leaving 1–2 hours between medicines is often recommended in leaflets.

Signs you’re taking them too often

Get medical help urgently or at least same‑day advice if you:

  • Have persistent heartburn or indigestion for more than 1–2 weeks despite using Rennies
  • Need close to the maximum dose every day
  • Notice symptoms of possible overdose such as nausea, vomiting, constipation, tiredness, muscle weakness, increased thirst or peeing a lot

These can be signs of too much calcium/magnesium or that there is a more serious underlying problem needing proper investigation, not just antacids.

Quick takeaway for “how often”

  • Yes, you can take Rennies multiple times a day.
  • Use 1–2 tablets per dose, only when you actually need them.
  • Never exceed the maximum number of tablets listed on your packet in 24 hours (commonly 10–11).
  • Do not keep using them daily for longer than about 1–2 weeks without seeing a doctor to check why you need them so often.

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

If you tell me exactly which Rennie product you have (e.g. “Rennie Peppermint”, “Rennie Dual Action”), I can adapt these numbers more precisely to your pack.