Pharmacy Guide
Patient leaflets and SmPCs, drug interaction checker, official dosages and NHS pharmacy opening hours — all in one place.
Pharmacy Guide
Patient leaflets and SmPCs, drug interaction checker, official dosages and NHS pharmacy opening hours — all in one place.
Micralax Micro-enema
⚠ This medicine appears to have been discontinued
The electronic medicines compendium (emc) no longer publishes a Summary of Product Characteristics for this product, which usually means it is no longer marketed in the UK. The patient leaflet below is kept for reference, but the product may not be available.
If you were prescribed this medicine, other products containing Sodium citrate, Sodium alkylsulfoacetate may still be available. Do not stop your treatment — ask your pharmacist or GP what to use instead.
How to take it
Micralax
- Lie down on your side with your knees drawn up towards your tummy. If you prefer you can sit on the toilet
- Pull or twist the cap off the tube
- You can lubricate the nozzle to make it easier to put in. Squeeze a drop of medicine out onto the nozzle
- Put the full length of the nozzle into your back passage
- Gently squeeze the tube until it is empty
- Keep squeezing the tube as you pull the nozzle out. This is to stop the medicine being drawn back into the tube
- Wait for the laxative to work. This takes 5-15 minutes.
If you use more Micralax than you should
If you accidentally use too much Micralax, contact the nearest hospital casualty department or your doctor as soon as possible. If you have any further questions about the use of this medicine, ask your doctor or pharmacist.
Possible side effects
Stop taking Micralax and immediately contact a doctor if you notice any of the following side effects:
Not known (frequency cannot be estimated from the available data):
- Sudden, severe allergic reaction with breathing difficulty, swelling, fast heartbeat, sweating, lightheadedness, loss of consciousness (anaphylactic reaction including shock). Like all medicines Micralax can cause side effects, although not everybody gets them. Most people find that using this medicine causes no side effects, provided it is used correctly. If you use Micralax too much it may cause diarrhoea or loss of fluid.
Reporting of side effects If you get any side effects, talk to your doctor or pharmacist. This includes any possible side effects not listed in this leaflet. You can also report side effects directly via Yellow Card Scheme Website: 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.
How to store it
Micralax
Keep out of the sight and reach of children. Do not use Micralax after the expiry date on the pack. The expiry date refers to the last day of that month. Store below 25°C. Medicines should not be disposed of via wastewater or household waste. Return any medicine you no longer need to your pharmacist.
6. Further information
What Micralax contains The active substances are 450 mg sodium citrate dihydrate and 45 mg sodium alkylsulphoacetate. The other ingredients are sorbitol solution, glycerol, sorbic acid and purified water.
What Micralax looks like Micralax is a colourless liquid that comes in disposable plastic 5ml tube with 5 – 6 cm long flexible nozzle. Micralax comes in cartons containing 12 tubes.
Marketing Authorisation Holder RPH Pharmaceuticals AB, Box 603, 101 32 Stockholm, Sweden. Manufacturer Meribel Pharma Karlskoga AB, Björkbornsvägen 5, 691 33 Karlskoga, Sweden
This leaflet was last updated December 2025.
If this leaflet is difficult to see or read or you would like it in a different format, please contact: RPH Pharmaceuticals AB, Box 603, 101 32 Stockholm, Sweden.
Frequently asked questions about Micralax Micro-enema
What is the active substance in Micralax Micro-enema?
The active substance in Micralax Micro-enema is sodium citrate, sodium alkylsulfoacetate.
Where does this information come from?
This leaflet reproduces the patient information leaflet approved for Micralax Micro-enema, as published on the electronic medicines compendium (emc). The version printed inside your medicine’s packaging is the one that applies to you.
Can I get Micralax Micro-enema without a prescription?
Whether a medicine is available over the counter or on prescription only depends on its licence. Check the leaflet, or ask your pharmacist — they can tell you straight away.
About this leaflet
The text above reproduces the patient information leaflet approved for this medicine, restructured for easier reading.
- Source: electronic medicines compendium (emc), Datapharm
- Active substance: sodium citrate, sodium alkylsulfoacetate
- Official document: view the original leaflet on emc →
⚕For healthcare professionals — Summary of Product Characteristics (SmPC)Full SmPC: dosage, interactions, contraindications, warnings+
4.1. Therapeutic indications
Micralax is indicated whenever an enema is necessary to relieve constipation: in dyschezia, especially in bedridden patients; in geriatrics, paediatrics and obstetrics; and in preparation for X-ray examination, proctoscopy and sigmoidoscopy.
4.2. Posology and method of administration
Adults and children aged 3 years and over: Administer the contents of one micro-enema rectally, inserting the full length of the nozzle. No lubricant is needed as a drop of the mixture is sufficient.
Micralax usually works within 5 to 15 minutes, so make sure you are near a toilet before using it.
Always use a fresh tube of Micralax every time.
1. Lie down on your side with your knees drawn up towards your tummy or, if you prefer, sit on the toilet.
2. Pull or twist the cap off the tube.
3. If you want to lubricate the nozzle before inserting it, squeeze a drop of liquid out onto the nozzle.
4. Insert the full length of the nozzle into your back passage.
5. Gently squeeze the tube until it is empty.
6. Keep squeezing the tube as you pull the nozzle out of your back passage. This is to stop the medicine being drawn back into the tube.
7. Wait for the laxative to work (5-15 minutes)
4.3. Contraindications
Do not use in patients with inflammatory bowel disease.
4.6. Pregnancy and lactation
No special recommendations.
4.8. Undesirable effects
Tabulated list of adverse reactions
System organ class
Frequency
Adverse reaction
Immune system disorders
Not known
Anaphylactic reaction
Hypersensitivity (e.g, Urticaria)
Excessive use may cause diarrhoea and fluid loss, which should be treated symptomatically.
Reporting of suspected adverse reactions
Reporting suspected adverse reactions after authorisation of the medicinal product is important. It allows continued monitoring of the benefit/risk balance of the medicinal product. Healthcare professionals are asked to report any suspected adverse reactions via Yellow Card Scheme Website: www.mhra.gov.uk/yellowcard or search for MHRA Yellow Card in the Google Play or Apple App Store.
4.9. Overdose
Not applicable.
💬 Ask about this leaflet
Ask anything about Micralax Micro-enema. The assistant answers only from this leaflet — if the leaflet does not cover it, it will say so. It does not give medical advice.
Answers come from the patient leaflet published on the electronic medicines compendium (emc). They are not medical advice. Ask a pharmacist or your GP if you are unsure. For urgent help call NHS 111, or 999 in an emergency.