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Dantrolene Sodium: Brands, Price & Uses in Bangladesh
Dantrolene Sodium is a direct-acting skeletal muscle relaxant with two well-established, FDA-approved indications: 1.
About Dantrolene Sodium
Indications of Dantrolene Sodium
Dantrolene Sodium is a direct-acting skeletal muscle relaxant with two well-established, FDA-approved indications:
1. Chronic Spasticity (Established Use)
Used for the treatment of spasticity resulting from upper motor neuron disorders, including:
- Spinal cord injury
- Cerebral palsy
- Multiple sclerosis
- Stroke
Dantrolene Sodium is indicated only when spasticity interferes with function or nursing care and relief is expected to give an overall functional benefit; it is not indicated when spasticity is needed to sustain posture or balance during walking.
2. Malignant Hyperthermia (Established Use)
The intravenous formulation of Dantrolene Sodium is the specific treatment for malignant hyperthermia (MH), a rare, life-threatening hypermetabolic reaction to certain general anesthetic agents. It is also used:
- As preoperative prophylaxis in patients known or suspected to be susceptible to MH
- Following an acute MH crisis, to help prevent recurrence
Off-Label Uses (Not FDA-Approved)
Dantrolene Sodium has also been used off-label, based on case reports and clinical experience, for severe hyperthermic emergencies such as neuroleptic malignant syndrome, exertional heat stroke, and stimulant (e.g., MDMA)-associated hyperthermia when standard cooling and supportive measures are insufficient. Such use should only be undertaken by specialists in a hospital or critical care setting.
Dosage & Administration of Dantrolene Sodium
Dosage of Dantrolene Sodium must be individualized to the indication and titrated to the lowest effective dose.
| Indication | Population | Typical Dosing |
|---|---|---|
| Chronic spasticity (oral) | Adults | Initiate 25 mg once daily; if tolerated, increase gradually at weekly intervals to 25 mg three times daily, then 50 mg three times daily, then 100 mg three times daily, as needed. Maximum dose is typically 100 mg four times daily. |
| Chronic spasticity (oral) | Children (5 years and older) | Initiate approximately 0.5 mg/kg once daily; increase gradually at weekly intervals as tolerated, up to a maximum of 100 mg four times daily. Not established for children under 5 years — see Pediatric Use. |
| Malignant hyperthermia crisis (IV) | Adults and children | Administered by rapid intravenous injection, starting at approximately 1 mg/kg, repeated as needed up to a cumulative dose of about 10 mg/kg, until symptoms subside. Must only be given by trained personnel in a hospital setting. |
| Malignant hyperthermia prophylaxis (oral or IV) | At-risk patients before surgery | Oral: approximately 4-8 mg/kg/day in 3-4 divided doses for 1-2 days before surgery, with the last dose 3-4 hours preoperatively. IV: a single preoperative infusion may be used per institutional protocol. |
| Post-crisis prevention | Adults and children | Approximately 4-8 mg/kg/day in 4 divided doses for 1-3 days following a treated malignant hyperthermia crisis. |
Daily doses above 400 mg are rarely needed and substantially increase the risk of serious liver injury (see Precautions and Warnings). If no clinical benefit is seen for chronic spasticity within 45 days, Dantrolene Sodium should be discontinued.
Side Effects of Dantrolene Sodium
The most common side effects of Dantrolene Sodium, especially during the first two weeks of therapy or with dose increases, include:
- Drowsiness and generalized weakness
- Dizziness and light-headedness
- Fatigue and malaise
- Diarrhea (usually mild and transient; may require temporary dose reduction)
Less common effects include constipation, loss of appetite, speech disturbance, and blurred or double vision.
Serious Side Effects
Serious but less common reactions include liver injury/hepatitis (see Precautions and Warnings for full detail), pleural effusion with pericarditis, blood disorders such as aplastic anemia or leukopenia, and hypersensitivity or photosensitivity reactions. Seek prompt medical attention for yellowing of the skin or eyes, unusual bleeding or bruising, severe breathlessness, or chest pain while taking Dantrolene Sodium.
Contraindications of Dantrolene Sodium
Dantrolene Sodium is contraindicated in the following situations:
- Known hypersensitivity to Dantrolene Sodium or any component of the formulation.
- Active hepatic disease, including hepatitis or cirrhosis, whether idiopathic or of another cause.
- Spastic conditions in which spasticity is being used to sustain upright posture and balance during walking, or where spasticity is needed to obtain increased motor function — in these situations, reducing spasticity with Dantrolene Sodium may worsen overall function.
- Breastfeeding — use of Dantrolene Sodium is contraindicated in nursing mothers (see Pregnancy and Lactation).
Frequently Asked Questions about Dantrolene Sodium
What is Dantrolene Sodium used for?
Dantrolene Sodium is used to treat chronic muscle spasticity caused by conditions such as spinal cord injury, cerebral palsy, multiple sclerosis, or stroke, and — in its intravenous form — to treat and prevent malignant hyperthermia, a rare but life-threatening reaction that can occur during general anesthesia.
Can Dantrolene Sodium cause liver damage?
Yes. Dantrolene Sodium carries a boxed warning for potentially serious, and rarely fatal, liver injury. The risk is higher with daily doses above 400 mg, prolonged use, in women, in people over 35, and with certain other medications. Your doctor will check your liver function before starting Dantrolene Sodium and periodically during treatment.
Is Dantrolene Sodium safe during pregnancy or breastfeeding?
Dantrolene Sodium should be used in pregnancy only if your doctor decides the benefit clearly outweighs the potential risk to the baby. It is contraindicated during breastfeeding because it passes into breast milk; discuss feeding options with your doctor if you need this medicine.
What are the common side effects of Dantrolene Sodium?
The most common side effects are drowsiness, dizziness, general muscle weakness, fatigue, and diarrhea, particularly when starting treatment or increasing the dose. Avoid driving or operating machinery until you know how Dantrolene Sodium affects you.
Can children take Dantrolene Sodium?
Dantrolene Sodium is approved for chronic spasticity in children aged 5 years and older, using a weight-based dose that your doctor will calculate. It is not established as safe and effective for spasticity in children under 5, but the intravenous form can still be used at any age in a genuine malignant hyperthermia emergency.
What should I do if I miss a dose or think I have taken too much Dantrolene Sodium?
If you miss a dose, take it as soon as you remember unless it is close to your next dose — do not double up. If you or someone else has taken too much Dantrolene Sodium and shows symptoms like severe weakness, confusion, or persistent vomiting, seek immediate medical attention or contact emergency services or poison control right away.
Disclaimer
The information provided is accurate to the best of our knowledge, but it does not replace professional medical advice. We cannot guarantee its completeness or accuracy, and the absence of specific information about a drug should not be taken as an endorsement. We are not responsible for any consequences arising from this information, so please consult a healthcare professional for any concerns or questions.