Patient Leaflet Updated 26-Nov-2025 | Alan Pharmaceuticals
Diacomit powder sachets (250mg and 500mg)
Diacomit 250 mg powder for oral suspension in sachet
Diacomit 500 mg powder for oral suspension in sachet
stiripentol
1. What Diacomit is and what it is used for
2. What you need to know before you take Diacomit
3. How to take Diacomit
4. Possible side effects
5 How to store Diacomit
6. Contents of the pack and other information
Stiripentol, the active ingredient of Diacomit, belongs to a group of medicines called antiepileptics.
It is used in conjunction with clobazam and valproate (other antiepileptic medicines) to treat a certain form of epilepsy called Dravet’s syndrome (DS). Your doctor has prescribed this medicine to help treat your epilepsy.
Talk to your doctor or pharmacist before taking Diacomit
If you have problems with certain ingredients of Diacomit (e.g. aspartame, glucose, sorbitol). In this case, please see below: “Important information about some of the ingredients of Diacomit”.
Tell your doctor or pharmacist if you are using, have recently used or might use any other medicines.
Tell your doctor if you are taking any of the following medicines:
Do NOT take Diacomit with fruit juice, fizzy drinks or food and drinks that contain caffeine or theophylline (for example cola, chocolate, coffee, tea and energy drinks).
If you are pregnant or breast-feeding, think you may be pregnant or are planning to have a baby, ask your doctor for advice before taking this medicine.
During pregnancy, effective antiepileptic treatment must NOT be stopped.
Breast-feeding is not recommended during treatment with this medicine.
This medicine may make you feel sleepy.
You should not use any tools, machines, ride or drive if affected in this way. Check with your doctor.
This medicine contains 2.5 mg aspartame in each 250mg-sachet and 5 mg each 500mg-sachet.
Aspartame is a source of phenylalanine. It may be harmful if you have phenylketonuria (PKU), a rare genetic disorder in which phenylalanine builds up because the body cannot remove it properly.
This medicine contains sorbitol: 2.4 mg in each 250mg-sachet and 4.8 mg in each 500mg-sachet. Glucose may be harmful to the teeth.
If you have been told by your doctor that you have an intolerance to some sugars, contact your doctor before taking this medicinal product.
This medicine contains less than 1 mmol sodium (23 mg) per sachet, that is to say essentially ‘sodium-free’.
You should always take the contents of each sachet exactly as your doctor has told you. You should check with your doctor or pharmacist if you are not sure.
The dose is adjusted by the doctor according to your age, weight and condition, generally 50 mg per kg bodyweight and per day.
You should take this medicine two or three times a day at regular intervals as directed by your doctor: for example morning - noon - bed-time to cover the night-and-day period.
Dose increases should be gradual, taking place over a few weeks while the dose(s) of the other antiepileptic medicine(s) is (are) reduced at the same time. Your doctor will tell you the new dose of the other antiepileptic medicine(s).
If you have the impression that the effect of this medicine is too strong or too weak, talk to your doctor or pharmacist. The dose will be adjusted by the doctor according to your condition.
Please consult your doctor in the event of any side effects as the doctor may have to adjust the dose of this medicine and the other antiepileptic medicine(s).
There are slight differences between the Diacomit capsules and powder for oral suspension. If you experience any problems when switching from taking the capsules to the powder for oral suspension or vice versa please inform your doctor. In case of switch between capsule and powder formulation it should be done under the close supervision of your doctor.
In case of vomiting within the first few minutes of intake it is assumed that no medicine has been absorbed and a new dose should be given.
However, the situation is different if the vomiting occurs more than one hour after medicine intake because stiripentol is quickly absorbed. In such a case, it is assumed that a significant fraction of the administered dose has been absorbed systemically from the digestive tract. Thus, there would be no need for a new intake or for an adjustment of the next dose.
The powder should be mixed in a glass of water and should be taken immediately after mixing during the meal.
For food and drinks to be avoided, see the section “Diacomit with food and drink” above.
Contact your doctor if you know or think you have taken more medicine than you should have.
It is important that you take this medicine regularly at the same time each day. If you forget to take a dose, you should take it as soon as you remember unless it is time for the next dose. In that case carry on with the next dose as normal. You should not take a double dose to make up for a forgotten individual dose.
You must not stop taking this medicine unless the doctor tells you to. Stopping treatment suddenly can lead to an outbreak of seizures.
If you have any further questions on the use of this medicine, ask your doctor or pharmacist.
Like all medicines, this medicine can cause side effects, although not everybody gets them.
Very common side effects (may affect more than one in 10 people):
Common side effects (may affect up to1 in 10 people):
Uncommon side effects (may affect up to 1 in 100 people):
Rare side effects (may affect up to 1 in 1,000 people)
Not known (frequency cannot be estimated from the available data)
To eliminate these side effects, your doctor may have to change the dose of Diacomit or one of the other medicines prescribed for you.
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 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.
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.
This medicine is a pale pink powder supplied in sachets.
Cartons contain either 30, 60 or 90 sachets. Not all pack sizes may be marketed.
This medicine is a pale pink powder supplied in sachets.
Cartons contain either 30, 60 or 90 sachets. Not all pack sizes may be marketed.
Diacomit is also available as 250 mg and 500 mg capsules for oral use
For any information about this medicine, please contact the Marketing Authorisation Holder.
This leaflet was last revised in August 2025.
Highgate Business Centre, 33 Greenwood Place, London, London, NW5 1LB, UK
0207 284 2887
0133 241 8984
0207 284 2887
http://www.alanpharmaceuticals.com