Treats muscle spasms caused by multiple sclerosis, cerebral palsy, or damage to your brain or spinal cord. Also used to treat and prevent symptoms of malignant hyperthermia (an inherited muscle disorder) in people who are at risk.
You should not use this medicine if you have had an allergic reaction to dantrolene, or if you have active liver disease (especially hepatitis or cirrhosis). This medicine should not be used to treat muscle spasms caused by rheumatic disorders.
Your doctor will tell you how much of this medicine to use and how often. Your dose may need to be changed several times in order to find out what works best for you. Do not use more medicine or use it more often than your doctor tells you to.
If a dose is missed:
If you miss a dose or forget to use your medicine, use it as soon as you can. If it is almost time for your next dose, wait until then to use the medicine and skip the missed dose. Do not use extra medicine to make up for a missed dose.
Ask your doctor or pharmacist before using any other medicine, including over-the-counter medicines, vitamins, and herbal products.
Tell your doctor if you are using any medicines that make you sleepy. These include sleeping pills, cold and allergy medicine, narcotic pain relievers, and sedatives.
Make sure your doctor knows if you are also using any other medicine to treat your MS, cerebral palsy, or related muscle problems. Tell your doctor if you are using a medicine that contains estrogen (such as birth control pills, Estratest®, or Premarin®), or if you are using a heart or blood pressure medicine (such as diltiazem, nifedipine, verapamil, Adalat®, Calan®, Cardizem®, Cartia®, Lotrel®, Procardia®, or Tiazac®).