Patient Leaflet Updated 04-Jun-2025 | Bayer plc
Alka-Seltzer Original
Alka-Seltzer®
ORIGINAL
Aspirin
Always take this medicine exactly as described in this leaflet or as your doctor or pharmacist has told you.
1. What Alka-Seltzer Original is and what it is used for
2. What you need to know before you take Alka-Seltzer Original
3. How to take Alka-Seltzer Original
4. Possible side effects
5. How to store Alka-Seltzer Original
6. Contents of the pack and other information
Alka-Seltzer Original are effervescent tablets which dissolve in water to give a sparkling solution.
The active substance is aspirin (acetylsalicylic acid).
Aspirin belongs to a group of medicines known as non-steroidal anti-inflammatory drugs (NSAIDS). It is used for the treatment of pain and reduction of fever and also has anti-inflammatory properties.
Alka-Seltzer Original can be used for the:
Talk to your doctor before taking Alka-Seltzer Original if you:
Aspirin can cause Reye's syndrome when it is given to children. Reye's syndrome is a very rare disease, which can be fatal. For this reason aspirin should not be given to children under 16 years, unless your doctor tells you to.
Please tell your doctor or pharmacist if you are taking or have recently taken any other medicines, including medicines obtained without a prescription.
Aspirin can affect the way in which some medicines work. These medicines include:
Avoid taking alcohol while taking Alka-Seltzer Original.
Do not take Alka-Seltzer Original if you are in the last 3 months of pregnancy as it could harm your unborn child or cause problems at delivery. Aspirin can cause kidney and heart problems in your unborn baby. It may affect your and your baby’s tendency to bleed and cause labour to be later or longer than expected.
You should not take this product during the first 6 months of pregnancy unless absolutely necessary and advised by your doctor.
Do not take Alka-Seltzer Original if you are breastfeeding. The product belongs to a group of medicines which may impair the fertility in women. This effect is reversible on stopping the medicine. Speak to your doctor before taking this medicine if you are trying for a baby.
Always ask your doctor or pharmacist for advice before taking any medicine.
This medicine contains 477 mg sodium (main component of cooking/table salt) in each tablet. This is equivalent to 23.85% of the recommended maximum daily dietary intake of sodium for an adult.
Follow the directions below closely. You should ask your doctor or pharmacist if you are unsure how to use this medicine.
Alka-Seltzer Original tablets must always be dissolved in water before use.
Adults and children over 16:
Two tablets dissolved in half a glass (100ml) of water may be taken every 4 hours as required. You should not take more than 8 tablets in 24 hours.
Not recommended in children under 16.
Make sure you follow the dosage instructions and do not take more than the stated dose.
Do not take Alka-Seltzer Original for more than 3 days in a row. If you do not get better, talk to your doctor.
If you think you have taken too many tablets you should go to your nearest Accident and Emergency Department or contact your doctor immediately. Take this leaflet with you and any packaging to show what you have taken.
Like all medicines Alka-Seltzer Original can cause side effects although not everybody gets them.
If you experience any of the following side effects, stop taking Alka-Seltzer Original and go to your nearest Accident and Emergency Department or doctor immediately:
If you get any side effects, talk to your doctor, pharmacist or nurse. This includes any possible side effects not listed in this leaflet. You can also report side effects directly via the Yellow Card Scheme at: www.mhra.gov.uk/yellowcard or search for MHRA Yellow Card in the Google Play or Apple App Store. By reporting side effects you can help provide more information on the safety of this medicine.
Keep out of the sight and reach of children.
Do not store above 25°C. Store in a dry place. This product should be stored in its original carton.
This product is packaged in pouches containing 1 or 2 tablets. If the pouch is damaged or if a tablet is powdery or discoloured, do not use the tablet.
Do not use Alka-Seltzer Original after the expiry date which is stated on the carton and on the foil pouch. The expiry date refers to the last day of that month.
Do not throw away any medicines via wastewater or household waste. Ask your pharmacist how to throw away medicines you no longer use. These measures will help protect the environment.
The active substance is aspirin (acetylsalicylic acid) (324mg per tablet).
The other ingredients are sodium hydrogen carbonate and citric acid.
See Section 2 for sodium advice.
Alka-Seltzer Original comes in cartons containing 2, 8, 10, 12, 20 or 30 white effervescent tablets packaged in foil pouches. Not all pack sizes may be marketed.
This leaflet was last revised in April 2025.
Alka-Seltzer® is a registered trademark.
Bayer
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400 South Oak Way, Reading, Berkshire, RG2 6AD
http://www.bayer.co.uk