Side Effects
Drug information provided by: Merative, Micromedex®
Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention. Serious side effects are very rare when dantrolene is taken for a short time, for example, when it is used for a few days before, during, or after surgery or anesthesia to prevent or treat malignant hyperthermia. However, serious side effects may occur, especially when the medicine is taken for a long time.
Check with your doctor immediately if any of the following side effects occur:
Less common
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Bloody or black, tarry stools
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bloody or dark urine
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bluish color changes in skin color
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changes in speech
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chest pain
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confusion
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constipation
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convulsions (seizures)
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decrease in frequency of urination
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decrease in urine volume
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difficult urination
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difficulty in moving
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difficulty in passing urine (dribbling)
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difficulty in swallowing
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fast, pounding, or irregular heartbeat or pulse
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increased frequency of urination
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increased urge to urinate during the night
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joint pain
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light-colored stools
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lightheadedness
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loss of bladder control
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mental depression
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muscle aching or cramping
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muscle pains or stiffness
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muscle spasm or jerking of all extremities
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nausea and vomiting
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pain in lower back
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pain or burning while urinating
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pain, tenderness, or changes in skin color
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painful urination
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severe stomach pain
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shortness of breath
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skin rash, hives, or itching
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slow or troubled breathing
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sudden decrease in amount of urine
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sudden loss of consciousness
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swelling of foot or leg
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swollen joints
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unusual tiredness or weakness
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upper right abdominal pain
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vomiting of blood or material that looks like coffee grounds
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waking to urinate at night
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yellow eyes or skin
Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:
More common
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Diarrhea
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dizziness
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drowsiness
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general feeling of discomfort or illness
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muscle weakness
Less common
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Abdominal or stomach cramps or discomfort
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abnormal hair growth
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acne-like rash
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blurred or double vision or any change in vision
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change in taste
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chills and fever
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disturbed color perception
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excessive tearing
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halos around lights
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headache
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itching skin
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loss of appetite
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night blindness
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overbright appearance of lights
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redness of skin
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seeing double
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skin rash, encrusted, scaly and oozing
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sleeplessness
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slurring of speech or other speech problems
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sudden decrease in amount of urine
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sweating
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trouble in sleeping
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tunnel vision
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unable to sleep
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unusual nervousness
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weight loss
Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.
Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.
Portions of this document last updated: Sept. 01, 2024
Copyright: © Merative US L.P. 1973, 2024. All rights reserved. Information is for End User's use only and may not be sold, redistributed or otherwise used for commercial purposes.