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Dantrolene Side Effects

Your healthcare provider needs to know right away if you are using dantrolene and develop serious side effects, such as fever, problems speaking, or vomiting blood. Also, seek medical treatment if you develop anything that "just does not seem right." In most cases, however, people are able to take the drug without many problems. Common side effects include diarrhea, fatigue, and muscle weakness.

An Introduction to Side Effects of Dantrolene

Just like any medicine, dantrolene sodium (Dantrium®) can cause side effects. However, not everyone who uses the medication will have problems. In fact, most people tolerate it quite well. If side effects do occur, in many cases, they are minor and either require no treatment or are treated easily by you or your healthcare provider.
 
(This article covers many, but not all, of the possible side effects with dantrolene. Your healthcare provider can discuss a more complete list with you.)
 

Serious Dantrolene Side Effects

Some side effects of dantrolene are potentially serious and should be reported immediately to your healthcare provider. These include but are not limited to:
 
  • Severe or persistent diarrhea
  • Unusual bleeding or bruising
  • Black, tarry, or bloody stools
  • Blood in the urine
  • Vomiting blood or vomit that looks like coffee grounds
  • Pain or burning while urinating
  • More or less frequent urination or difficulty urinating
  • Signs of liver problems, such as:
 
    • Yellowing of the skin or whites of the eyes (jaundice)
    • Dark urine
    • Light-colored stools
    • Upper-right abdominal (stomach) pain
    • Nausea
    • Loss of appetite
 
  • Seizures
  • Changes in vision
  • Signs of anemia, such as:
 
    • Extreme tiredness
    • Pale skin
    • Shortness of breath
    • Dizziness
 
  • Swelling of the hands, legs, ankles, or feet
  • Unexplained weight gain
  • Mental or mood changes, such as:
 
 
  • A fast or abnormal heartbeat
  • Chest pain
  • Difficulty breathing or feeling like you are suffocating
  • A persistent dry cough
  • Pain, swelling, or redness in an arm or leg
  • Swelling, burning, stinging, pain, or leakage of fluid around the site where you are receiving your dose (if you receive this medicine intravenously)
  • Difficulty swallowing
  • Lightheadedness or fainting
  • Problems speaking
  • Swollen lymph nodes in the neck, underarms, groin, or other areas
  • Chills and fever
  • Muscle or joint pain
  • Signs of an allergic reaction, such as:
 
    • An unexplained rash
    • Hives
    • Itching
    • Swelling of the mouth or throat
    • Wheezing
    • Difficulty breathing.
 
Know the Signs - Concussion Safety

Dantrolene Drug Information

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