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Alka-Seltzer XS 20 Tablets

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Alka-Seltzer XS tablets can be used to treat a variety of conditions including; migraines, period pains, toothache, sore throats, aches and pains and symptoms of cold and flu.
Alka-Seltzer XS tablets are for fast and effective relief of general pain such as migraine, period pains, rheumatic and muscular pain, toothache, sore throat, nerve pain and the symptomatic relief of colds and flu. Alka-Seltzer XS tablets contain five active ingredients, aspirin, paracetamol, caffeine, sodium hydrogencarbonate and citric acid. The aspirin, paracetamol and caffeine combine to relieve pain and inflammation. Sodium hydrogen carbonate and citric acid create antacids when dissolved in water which helps to neutralise stomach acid and relieve the symptoms of heartburn and indigestion. Alka-Seltzer XS effervescent tablets are most effective in relieving headaches accompanied by an upset stomach, usually after over-indulgence in food and drink, but can be used to relieve many other types of aches and pains.
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Effervescent tablet containing: Aspirin 267 mg, Paracetamol 133 mg, caffeine 40mg Sodium Hydrogen Carbonate 1723mg, Citric acid 954mg. (Sodium content 472mg per tablet).

Alka-Seltzer XS must always be dissolved in water before taking. Adults and children aged 16 and over: 2 tablets in water every 4 hours as required. Maximum 8 tablets in 24 hours. The dosages should not be continued for more than three days without consulting your doctor.

Do not take Alka Seltzer XS if you are allergic to aspirin or to any other ingredients, have a stomach or duodenal ulcer, have haemophilia or are pregnant or breast feeding. Avoid if you are on a high dose of methotrexate. Speak to your doctor before taking Alka Seltzer XS if you suffer from asthma. Aspirin has also been associated with increased risk of Reye's Syndrome when given to children with a fever, for this reason the use of aspirin is not recommended in children under 16 years of age. You should ask your pharmacist before taking aspirin if you are taking any other medicines including those for blood clots (thrombosis) such as warfarin or gout. If you are unsure please check and always read the label.

Standard Delivery

Standard Mainland UK delivery is £3.95* 

We aim to deliver orders within 3-5 working days to the shipping address provided by you in your order if the shipping address is in the UK.  For orders being delivered outside mainland UK, this will be longer and we cannot give a guaranteed delivery time due to the differences between carriers. Delivery timescales are estimates only. If you do not receive your order within 14 days of us confirming your order has been sent you must notify us and we will investigate the non-delivery provided. Orders from outside the UK have varied delivery charges, depending on the particular country.  Please note that in some instances you may be required to answer product related questions from our Pharmacist as part of the checkout process.  Failiure to answer these will cause delays.  Please allow extra time for Pharmacy approved products.  Please note that Bank Holidays do not count as working days.

Delivery charges for orders outside the UK will vary. *Northern Ireland delivery charges different

Express UK Delivery

Express Mainland UK delivery is £6.95*, non mainland islands may vary

Please note that Express delivery is only available on orders placed before 1pm (GMT) Monday to Friday in the UK.  After 1pm we cannot guarantee express delivery, even if it has been selected.  Please note that this is not a guaranteed next day service, but is an expedited delivery option.  Products which need to be approved by a pharmacist are not suitable for express delivery.

*Northern Ireland delivery charges different

Free Delivery on orders over £50*

This applies to orders delivered to UK addresses only.  *Exclusions may apply.


We hope you will be happy with any items you’ve ordered from us, but if you’re not entirely satisfied, you’ll find details of our returns policy on the link below.

Delivery outside of the EU

Please note that certain medicines and medical devices sold on this website cannot be purchased if you live outside of the European Union.


Please visit our Delivery & Returns page for more information.