NZ Formulary

Dantrolene

dan-troe-leen

What does it do?

Dantrolene is used to treat muscle spasms associated with a variety of conditions.

How should you take it?

Take dantrolene regularly as directed with a glass of water.

What if you forget a dose?

If it is nearly time for your next dose, skip the missed dose and take your next dose at the usual time. Otherwise, take the missed dose as soon as you remember. Do not take two doses at the same time.

Can you take other medicines?

Tell your pharmacist or doctor about all medicines or treatments that you may be taking, including vitamins, herbal products (e.g. St John's wort) or recreational drugs.

What side effects might you notice?

Side EffectsRecommended action

Symptoms of liver problems including: yellow skin or eyes, itching, dark urine, pale bowel motions, abdominal pain

Fast or irregular heartbeat

Trouble breathing

Tell your doctor immediately

Skin rash, chills, fever

Muscle weakness

Tell your doctor

Tiredness, trouble sleeping

Headache, dizziness

Low mood, nervousness

Changes in vision

Diarrhoea, vomiting

Tell your doctor if troublesome

If you notice any other effects, discuss them with your doctor or pharmacist.

Other information:

  • Tell your doctor if you have liver, heart or lung problems.
  • Tell your doctor if you are pregnant, planning to become pregnant, or breastfeeding.
  • Dantrolene can impair your ability to do tasks such as driving or using machines. Alcohol makes this worse. Discuss your risk with your health professional. (search NZTA - Are you safe to drive?)
  • Protect yourself from too much sunlight while being treated with dantrolene. Always cover up and apply a thick layer of broad spectrum sunscreen (at least SPF 30) when outside. Do not use sunbeds.