Active ingredient
- dantrolene sodium
Legal Category
POM: Prescription only medicine
POM: Prescription only medicine
The Patient Information Leaflet (PIL) is the leaflet included in the pack with a medicine. It is written for patients and gives information about taking or using a medicine. It is possible that the leaflet in your medicine pack may differ from this version because it may have been updated since your medicine was packaged.
Below is a text only representation of the Patient Information Leaflet. The original leaflet can be viewed using the link above.
The text only version may be available in large print, Braille or audio CD. For further information call emc accessibility on 0800 198 5000. The product code(s) for this leaflet is: PL20011/0032.
Dantrium 25mg and 100mg Capsules
PACKAGE LEAFLET: INFORMATION FOR THE USER
Dantrium® 25 mg Capsules / Dantrium® 100 mg Capsules
Dantrolene sodium
Read all of this leaflet carefully before you start taking this medicine because it contains important information for you.
What is in this leaflet:
1. What Dantrium Capsules are and what they are used for
2. What you need to know before you take Dantrium Capsules
3. How to take Dantrium Capsules
4. Possible side effects
5. How to store Dantrium Capsules
6. Contents of the pack and other information
1. What Dantrium Capsules are and what they are used for
Dantrium Capsules contain the active substance dantrolene sodium – this is a muscle relaxant which is used to treat severe, long term muscle stiffness (spasticity) in adults.
2. What you need to know before you take Dantrium Capsules
DO NOT take Dantrium Capsules if:
DO NOT give Dantrium Capsules to children.
Warnings and precautions
Talk to your doctor, pharmacist or nurse before taking Dantrium Capsules.
Take special care with Dantrium Capsules if you:
Liver function tests should be performed frequently before start and during Dantrium Capsules therapy as the risk of liver toxicity appears to be greater in:
Other medicines and Dantrium Capsules
Please tell your doctor, pharmacist or nurse if you are taking or have recently taken any other medicines, including medicines obtained without a prescription. Talk to your doctor before taking Dantrium Capsules if you are already taking:
Dantrium Capsules with food, drink and alcohol
Avoid taking alcohol with this medicine as it may make you feel dizzy or drowsy.
Pregnancy, breast-feeding and fertility
Do not take the capsules if pregnant or breast-feeding unless advised otherwise by your doctor.
If you are pregnant or breast-feeding, think you may be pregnant or are planning to have a baby, ask your doctor, pharmacist or nurse for advice before taking this medicine.
Driving and using machines
Dantrium Capsules may cause drowsiness or dizziness. These symptoms may be intensified if you have consumed alcohol.
Do not take the capsules without talking to your doctor if you drive or are involved in hazardous activities.
Dantrium Capsules contain Lactose.
If you have been told by your doctor that you have an intolerance to some sugars, speak to your doctor before taking this medicine.
Dantrium 25 mg Capsules only, contain Sunset yellow colouring (E110) and may cause allergic reactions.
3. How to take Dantrium Capsules
Always take Dantrium Capsules exactly as your doctor or pharmacist or nurse has told you. You should check with your doctor or pharmacist or nurse if you are not sure. Your doctor will want to make sure that the capsules do not affect your liver. This will mean having blood tests before you start and while you are taking them.
Adults and Elderly:
Dantrium Capsules are to be taken by mouth. Swallow the capsule with a glass of water. The dose will vary from person to person.
Use in children
Children should NOT be given Dantrium Capsules.
If you take more Dantrium Capsules than you should
Do not exceed the recommended dose. If you take too much medicine, tell your doctor immediately or go to your nearest Accident & Emergency Department (take the pack with you if possible).
If you forget to take Dantrium Capsules
If you miss a dose, do not take a double dose to make up for a forgotten capsule; continue taking your medicine as normal at the correct time. If you have any further questions on the use of this product, ask your doctor or pharmacist or nurse.
4. Possible side effects
Like all medicines, this medicine can cause side effects, although not everybody gets them.
You may suffer an allergic reaction, symptoms of which include rash, itching, difficulty in breathing or swelling of the face, lips, throat or tongue. If this happens to you, stop taking the capsules immediately and seek urgent medical attention.
Immediately inform your health care provider if you have discoloured stool, generalised itch, yellowing of skin and eyes, loss of appetite, feeling sick, abnormal blood tests, as this may be signs of a serious liver disorder.
The following side effects have also been reported:
Common: may affect up to 1 in 10 people
Uncommon: may affect up to 1 in 100 people
Unknown: frequency cannot be estimated from the available data
If any of the side effects gets serious, or if you notice any side effects not listed in this leaflet, please tell your doctor.
Reporting of side effects
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
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.
5. How to store Dantrium Capsules
Keep out of the sight and reach of children.
Store Dantrium Capsules below 30°C.
Do not take Dantrium Capsules after the expiry date which is stated on the label after “Exp”. The expiry date refers to the last day of that month.
Medicines should not be disposed of via wastewater or household waste. Ask your pharmacist how to dispose of medicines no longer required. These measures will help to protect the environment.
6. Contents of the pack and other information
What Dantrium Capsules contain
What Dantrium Capsules look like and contents of the pack:
Marketing Authorisation Holder:
Manufacturer:
If you need further information or this leaflet in an alternative format please ring 0800 198 5000.
This leaflet was last revised in 02/2020
Norgine House, Widewater Place, Moorhall Road, Harefield, Middlesex, UB9 6NS
+44 (0)1895 825 865