April 28, 2017
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(mirabegron) Extended-release Tablets


Mirabegron is a beta-3 adrenergic agonist. The chemical name is 2-(2-aminothiazol-4-yl)-N-[4-(2- {[(2R)-2-hydroxy-2-phenylethyl]amino}ethyl)phenyl]acetamide having an empirical formula of C21H24N4O2S and a molecular weight of 396.51. The structural formula of mirabegron is:

MYRBETRIQ® (mirabegron) Structural Formula Illustration

Mirabegron is a white powder. It is practically insoluble in water (0.082 mg/mL). It is soluble in methanol and dimethyl sulfoxide.

Each MYRBETRIQ® extended-release tablet, for oral administration contains either 25 mg or 50 mg of mirabegron and the following inactive ingredients: polyethylene oxide, polyethylene glycol, hydroxypropyl cellulose, butylated hydroxytoluene, magnesium stearate, hypromellose, yellow ferric oxide, and red ferric oxide (25 mg tablet only).

What are the possible side effects of mirabegron (Myrbetriq)?

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.

Stop using mirabegron and call your doctor at once if you have a serious side effect such as:

  • fast or pounding heartbeats;
  • pain or burning when you urinate;
  • painful or difficult urinatinn, trouble emptying your bladder; or
  • dangerously high blood pressure (severe headache, buzzing in your ears, anxiety, confusion, chest pain, shortness of breath, uneven heartbeats,...

Read All Potential Side Effects and See Pictures of Myrbetriq »

Last reviewed on RxList: 8/29/2016
This monograph has been modified to include the generic and brand name in many instances.

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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