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The most frequently occurring side effects of Dantrium have been drowsiness, dizziness, weakness, general malaise, fatigue, and diarrhea. These are generally transient, occurring early in treatment, and can often be obviated by beginning with a low dose and increasing dosage gradually until an optimal regimen is established. Diarrhea may be severe and may necessitate temporary withdrawal of Dantrium therapy. If diarrhea recurs upon readministration of Dantrium, therapy should probably be withdrawn permanently. Other less frequent side effects, listed according to system, are:
Psychiatric: Mental depression, mental confusion, increased nervousness.
Musculoskeletal: Myalgia, backache.
Respiratory: Feeling of suffocation, respiratory depression.
Special Senses: Excessive tearing.
Other: Chills and fever.
The published literature has included some reports of Dantrium use in patients with Neuroleptic Malignant Syndrome (NMS). Dantrium capsules are not indicated for the treatment of NMS and patients may expire despite treatment with Dantrium capsules.
For medical advice about adverse reactions contact your medical professional. To report SUSPECTED ADVERSE REACTIONS, contact JHP at 1-866-923-2547 or MEDWATCH at 1800-FDA-1088 (1-800-332-1088) or http://www.fda.gov/medwatch/.
Drug Abuse And Dependence
Drug abuse and dependency potential has not been evaluated in human or animal studies.
Read the Dantrium Capsules (dantrolene sodium capsules) Side Effects Center for a complete guide to possible side effects
Drowsiness may occur with Dantrium therapy, and the concomitant administration of CNS depressants such as sedatives and tranquilizing agents may result in further drowsiness.
While a definite drug interaction with estrogen therapy has not yet been established, caution should be observed if the two drugs are to be given concomitantly. Hepatotoxicity has occurred more often in women over 35 years of age receiving concomitant estrogen therapy.
Cardiovascular collapse in patients treated simultaneously with verapamil and dantrolene sodium is rare. The combination of therapeutic doses of intravenous dantrolene sodium and verapamil in halothane/α-chloralose anesthetized swine has resulted in ventricular fibrillation and cardiovascular collapse in association with marked hyperkalemia. Until the relevance of these findings to humans is established, the combination of dantrolene sodium and calcium channel blockers is not recommended during the management of malignant hyperthermia.
Administration of Dantrium may potentiate vecuronium-induced neuromuscular block.
Read the Dantrium Capsules Drug Interactions Center for a complete guide to possible interactions
Last reviewed on RxList: 7/25/2012
This monograph has been modified to include the generic and brand name in many instances.
Additional Dantrium Capsules Information
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Report Problems to the Food and Drug Administration
You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.
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