Rennie Liquid Heartburn Relief Mint - 150ml

In stock

Product & Safety Notice

  • The maximum purchase for this product is 100
  • You should see your doctor if you have difficulty swallowing, or you have symptoms that are unusual for you or that won't go away. Your symptoms are unlikely to be cancer but it is important to get them checked by a doctor.
Laura Henderson - Medical Content Writer
Laura Henderson
James O'Loan - CEO & Superintendent Pharmacist
James O'Loan
CEO & Superintendent Pharmacist
How we ensure accuracy in our content

What is Rennie Liquid Heartburn Relief?

Rennie Liquid Heartburn Relief is a liquid medicine which helps to ease heartburn, acid reflux, and indigestion. It’s ideal for those who suffer with heartburn or indigestion and don’t like to take solid remedies, such as Rennie tablets, and it has a delicious peppermint flavour.


What is heartburn?

Heartburn is a symptom of acid reflux, which happens when your stomach acid tries to work its way upwards out of your stomach and towards your throat. It’s a common condition which can be triggered by eating certain foods, such as coffee, alcohol, chocolate, or fatty or spicy foods. It can also be caused by other factors, such as pregnancy, stress, anxiety, smoking, or being overweight. If you have acid reflux or heartburn, you may notice the following symptoms:

  • A burning sensation in the middle of your chest, behind the heart
  • An unpleasant taste in the mouth
  • A cough
  • Hiccups
  • Bad breath
  • A hoarse voice
  • Feeling sick
  • Becoming bloated


How will this medicine help to treat my heartburn?

Rennie Liquid Heartburn Relief contains three active ingredients which work together to ease heartburn and indigestion:

  • Sodium bicarbonate
  • Sodium alginate
  • Calcium carbonate

It forms a protective layer over the contents of your stomach, keeping your stomach acid from moving upwards into the food pipe and causing discomfort and unpleasant symptoms.


Can I take this medicine if I’m pregnant or breastfeeding?

This medicine is safe to use during pregnancy or if you are breastfeeding. However, you should speak to your doctor or Chemist 4 U pharmacist before using this or any other medication at this time, to be sure that it is suitable for both you and your child.


Can I use this product if I’m taking other medication?

Some medicines can interact when taken together, causing unwanted side effects or making your medication less effective. You should speak to your doctor or Chemist 4 U pharmacist before taking this product if you are taking any other medication, including those obtained without prescription. This includes:

  • Antibiotics, including tetracyclines and quinolones, e.g. norfloxacin
  • Iron preparation
  • Antifungal medications, e.g. ketoconazole
  • Digoxin and beta blockers, which are used to treat heart conditions
  • Penicillamine, which is used for rheumatoid arthritis
  • Glucocorticoid, which is used for inflammatory and autoimmune disorders
  • Neuroleptics, which are used for mental illness
  • Thyroid hormones
  • Chloroquine, which is used for malaria
  • Estramustine, which is used for prostate cancer
  • Bisphosphonates, which is used for osteoporosis


Can children take this medicine?

Rennie Liquid Heartburn Relief can be used by children over the age of 6 who are suffering with indigestion or heartburn. However, children who are taking this medicine should always be supervised by a responsible adult.


How to take Rennie Liquid Heartburn Relief

Before using this medicine, shake the bottle well. Take Rennie Liquid Heartburn Relief by mouth, as needed, after meals and at bedtime.

  • For adults and children over the age of 12: Take 10 – 20ml (2 – 4 x 5ml spoonfuls) up to four times a day
  • For children aged 6 – 12: Take 5 – 10ml (1 – 2 x 5ml spoonfuls) up to four times a day


When should Rennie Liquid Heartburn Relief not be used?

Rennie Liquid Heartburn Relief is not suitable for children under the age of 6. Do not use this product if you are allergic to any of the listed ingredients. Speak to your doctor or Chemist 4 U pharmacist before taking this product if you have been advised to follow a low sodium (salt) diet, as this product contains small amounts of sodium.


Does this medicine have any side effects?

Like all medications, Rennie Liquid Heartburn Relief can have side effects, although not everyone will experience them. These include:

  • Allergic reaction, showing symptoms such as skin rash, difficulty breathing, dizziness, swelling of the face, lips, tongue, or throat.

If you experience these or any other side effects of this medication, stop use and speak to your doctor right away. For more information about reporting the side effects of medication, please see the MHRA’s Yellow Card Scheme.


How to store this medicine

Store in a cool, dry place which is below 25 degrees C. Do not refrigerate. Store in original packaging and do not use if expiry date printed on packaging has passed. Keep out of sight and reach of children.


Important Information

This product is a medicine; make sure to speak to your doctor or Chemist 4 U pharmacist before taking this product if you have an underlying medical problem or are taking any other medicine or complementary therapy. If your symptoms get worse or continue after taking this product, contact us or your doctor. For medical services in your area, please refer to

If you are pregnant, trying to become pregnant, or breastfeeding, speak to your doctor or our pharmacist before taking this product. If you suffer from any allergies, ask your doctor or our pharmacist if this medicine is right for you.

Store all medicines out of sight and reach of children.

Please read the included leaflet carefully before using this product.

Please contact your GP if appropriate regarding this product.


Helpful Advice on Medication Restrictions & Addiction

For further information on our medication restrictions policy, please click here.

If you are concerned about addiction to 'over the counter' medication, we urge you to visit the below links for professional help and advice:

Active Ingredients

  • Calcium Carbonate
  • Sodium Alginate
  • Sodium Bicarbonate


  • Each 5 ml of this medicine contains 133.5 mg Sodium Bicarbonate, 250 mg Sodium Alginate, 80 mg Calcium Carbonate. It also contains carbomer, sodium hydroxide, saccharin sodium, ethyl parahydroxybenzoate (E214), propyl parahydroxybenzoate (E216), butyl parahydroxybenzoate, isopropyl alcohol, peppermint oil and purified water.

Brand Information
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Shipping Times

MethodHandling TimeTransit TimeTimescaleApprox Cost
Standard Shipping (3-5 Working Days)123£2.95

Times are given in working days and are approximate. Costs may change based on order total, day of the week or location within the UK. Ability to hit timescales will depend on whether the products are ordered before a cut off time, as well as additional administration time incurred in reviewing your order.

Please review the estimates at the checkout.

Shipping Costs

Free UK Delivery on all orders over £30* - Delivery within 3-5 working days.

Standard UK Delivery - £2.95* - Delivery within 3-5 working days.

Express UK Delivery - £4.95** - Delivery within 1-2 working days.

Temperature Controlled Delivery - £8.85 - Delivery within 1-3 working days.

Please Note: These prices are shown as a guide only. All delivery times are approximate but have been obtained in good faith.

*Excluding refrigerated products and treatments which are subject to different postage charges.


Discreet Delivery

All our items are sent completely discreet for your peace of mind.

This means the packaging is plain, there is no mention of what product is inside your package and there is no mention of Chemist4U either.

We respect that many of our products are of a sensitive nature - this is why we take every step to keep your purchases private.

Returns Information

Customers can read our full returns policy by clicking here