Along with its needing effects, a drug 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 using 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 drug is taken for a long time.
Check with your family doctor immediately if any of the following side effects was happen
Less common
Convulsions - seizures; pain, tenderness, changes in skin color, or swelling of foot or leg; shortness of breath or slow or troubled breathing
Always check with your family doctor as soon as possible if any of the following side effects was happen
Less common
Bloody or dark urine; chest pain; confusion; constipation - severe; diarrhea - severe; difficult urination; mental depression; skin rash, hives, or itching; yellow eyes or skin
More common side effects may occur that usually don't needed medical attention. These side effects may go away during treat as your body adjusts to the drug. However, check with your family doctor if any of the following side effects continue or are bothersome:
More common
Diarrhea - mild; dizziness or lightheadedness; drowsiness; general feeling of discomfort or illness; muscle weakness; nausea or vomiting; unusual tiredness
Less common
Abdominal or stomach cramps or discomfort; blurred or double vision or any change in vision; chills and fever; constipation - mild; difficulty in swallowing; frequent urge to urinate or uncontrolled urination; headache; loss of appetite; slurring of speech or other speech problems; sudden decrease in amount of urine; trouble in sleeping; unusual nervousness
Other side effects not listed above may also occur in some diseaseds. If you notice any other problems, check with your family doctor.