Compare Dantrium vs. Myrbetriq

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


Dantrium (dantrolene)

Prescription only

Myrbetriq (mirabegron)

Prescription only
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.

Treats overactive bladder.

Myrbetriq (mirabegron) is a good treatment for overactive bladder with the least chance for dry mouth and constipation, but talk to your doctor if you have high blood pressure.

  • Dantrium (dantrolene) effectively treats malignant hyperthermia.
  • Can be used for muscle spasticity if other medications haven't worked.
  • Available as generic.
  • Myrbetriq (mirabegron) helps you to have better control over your urination.
  • Myrbetriq (mirabegron) causes less drowsiness and constipation than other medicines for overactive bladder.
  • May be used if you have glaucoma.
  • Myrbetriq (mirabegron) may be safer to use if you are over 65 years old.
  • 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.
  • Myrbetriq (mirabegron) might raise your blood pressure.
  • If you have an obstruction in your bladder, Myrbetriq (mirabegron) might make you retain more urine.
  • Myrbetriq (mirabegron) may be very expensive depending on your insurance.
  • Not recommended if you have severe liver or kidney disease.
Used for
  • Malignant hyperthermia
  • Chronic spasticity
  • Neuroleptic malignant syndrome
Dosage forms
  • Pill
  • Injection
  • Extended release
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Side effects
The Dantrium (dantrolene) FDA package insert doesn’t have numbers about how common side effects are.
8possible side effects
  • High blood pressure
  • Common cold symptoms
  • Urinary tract infection
  • Headache
  • Constipation
  • Chest cold infection
  • Joint pain
  • Rapid heart beat
See more detailed side effects
Risks and risk factors
  • 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
  • Increased blood pressure
    • Untreated high blood pressure
  • Urinary retention
    • Bladder outlet obstruction
  • Unusual swelling
See more detailed risks and warnings