Compare Zanaflex vs. Dantrium

Head-to-head comparisons of medication uses, side effects, ratings, and more.

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Zanaflex (tizanidine)

Prescription only

Dantrium (dantrolene)

Prescription only
Relaxes your muscles.

Zanaflex (tizanidine) isn't a first-choice treatment for muscle spasticity. Try other options before using this.

4.3/ 5 average rating with 26 reviewsforZanaflex
Relaxes your muscles.

Dantrium (dantrolene) effectively treats malignant hyperthermia (increased temperature and muscle contractions when receiving anesthesia) and is the only medicine used to treat the condition. Dantrium (dantrolene) is not a first-choice treatment for general muscle spasms because it can damage your liver.

Upsides
  • Relieves muscle spasticity.
  • Available as a generic.
  • Available in a tablet or capsule form. It also comes in a capsule that can be opened and sprinkled in applesauce for people that can't swallow pills.
  • Dantrium (dantrolene) effectively treats malignant hyperthermia.
  • Can be used for muscle spasticity if other medications haven't worked.
  • Available as generic.
Downsides
  • This isn't a first-choice muscle relaxing medication. Other drugs work better and have fewer side effects.
  • Takes over an hour to kick in and only lasts 3 to 6 hours.
  • Zanaflex (tizanidine) can lower blood pressure, so be careful if you are already on a blood pressure medication.
  • Need to be consistent every day in taking this with or without food.
  • Elderly individuals have more side effects when taking Zanaflex (tizanidine).
  • Not a first-choice treatment for muscle spasms because it can cause liver damage.
  • Can cause dizziness, sleepiness, and sometimes severe diarrhea.
  • Needs routine blood tests since it can injure your liver.
  • Dose needs to be increased slowly to minimize side effects.
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Used for
  • Malignant hyperthermia
  • Chronic spasticity
  • Neuroleptic malignant syndrome
Dosage forms
  • Pill
  • Pill
  • Injection
Price
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Reviews
26 reviews so far
81%
saidit'sworth it
73%
saiditworked well
19%
saidit'sa big hassle

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Side effects
17possible side effects
  • Dry mouth
    49%
  • Sleepiness
    48%
  • Weakness
    41%
  • Dizziness
    16%
  • Urinary tract infection
    10%
  • General infection
    6%
  • Liver test abnormality
    6%
  • Constipation
    4%
  • Vomiting
    3%
  • Speech disorder
    3%
  • Blurred vision
    3%
  • Urinary frequency
    3%
  • Flu syndrome
    3%
  • Involuntary muscle movement
    3%
  • Nervousness
    3%
  • Sore throat
    3%
  • Hay fever
    3%
See more detailed side effects
The Dantrium (dantrolene) FDA package insert doesn’t have numbers about how common side effects are.
Risks and risk factors
  • Liver damage
    • Taking maximum doses of Zanaflex (tizanidine)
  • Dizziness and low blood pressure
    • Age 65 years or older
    • Currently on blood pressure control medications
  • Sleepiness and driving impairment
    • Taking other medications that also cause sleepiness
    • Recreational drug use
    • Excessive alcohol use
    • Elderly
  • Withdrawal side effects
    • Stopping Zanaflex (tizanidine) suddenly
See more detailed risks and warnings
  • Liver injury
    • Taking 800 mg or more Dantrium (dantrolene) per day
    • Women
    • Over 35 years old
    • Elderly
    • History of liver disease or dysfunction
  • Drowsiness and dizziness
    • Alcohol or recreational drug use
  • Sun sensitivity
  • Lung disease
    • COPD
    • Heart failure
See more detailed risks and warnings