Can I take Aspirin and Carbonate together?

Why this happens

Carbonates are alkaline (antacids) and raise the pH level in your stomach and urine. In the stomach, this can cause some types of aspirin (especially enteric-coated ones) to dissolve too early. In the kidneys, less acidic urine causes aspirin to be cleared out of your system faster, lowering the amount of medicine in your blood.

To make sure your aspirin works properly, try to space the doses apart. Take your aspirin at least 2 hours before or 2 hours after taking any carbonate-based antacids or supplements.

Asthma

Do not take this medicine if you have a history of asthma triggered by aspirin or other non-steroidal anti-inflammatory drugs (NSAIDs), as it can cause a life-threatening asthma attack.

Children under 16 years old

Never give aspirin to children under 16 unless specifically prescribed by a doctor. It can cause Reye’s syndrome, a rare but very serious condition that causes swelling in the liver and brain.

Pregnancy (third trimester)

Do not take aspirin during the last 3 months of pregnancy as it can cause serious heart or kidney problems in the unborn baby and increase the risk of bleeding during delivery.

Alcohol

Drinking alcohol while taking aspirin can increase the risk of stomach irritation and bleeding. It is best to limit alcohol consumption or avoid it if you have a history of stomach ulcers.

Dairy products

While calcium carbonate is often used as a supplement, consuming very high amounts of dairy (milk, cheese, yoghurt) alongside calcium carbonate supplements can occasionally lead to 'milk-alkali syndrome', which causes high calcium levels in the blood.

Caffeine

Large amounts of caffeine (found in coffee, tea, and some fizzy drinks) can slightly reduce how much calcium your body absorbs from calcium carbonate.

Iron-rich foods or Spinach/Rhubarb

Calcium carbonate can prevent your body from absorbing iron from your food. Additionally, foods high in oxalates (like spinach and rhubarb) can reduce the absorption of calcium. It is best to take calcium carbonate at a different time of day from iron-rich meals.

Taking multiple medicines? Our Medicines Interaction Checker helps you check whether your prescriptions, over-the-counter medicines, and supplements are safe to take together. Simply search for your medicines to see potential interactions and what to do about them.

Disclaimer

This information is for general educational purposes only and should not be relied upon as a substitute for professional medical advice. Always consult your GP, pharmacist, or another qualified healthcare professional before making decisions about your medications. Individual circumstances may vary, and only a healthcare professional who knows your medical history can provide personalised guidance.