May 1, 2017
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(bromocriptine mesylate) Tablets


CYCLOSET Tablets contain micronized bromocriptine mesylate, a dopamine receptor agonist. Bromocriptine mesylate is chemically designated [Ergotaman-3',6',18-trione, 2-bromo-12'-hydroxy-2'-(1-methylethyl)-5'-(2-methylpropyl)-, monomethanesulfonate (salt), (5'α)-]. CYCLOSET is a single enantiomer with absolute configuration 5R, 8R, 2’R, 5’S, 11’S, 12’S. The structural formula of bromocriptine is shown below:

CYCLOSET® (bromocriptine mesylate) Structural Formula Illustration

Bromocriptine mesylate in CYCLOSET is a white or slightly colored micronized crystalline powder with a molecular formula of C32H40BrN5O5•CH4SO3 and a molecular weight of 750.72. CYCLOSET tablets contain bromocriptine mesylate USP in an amount equivalent to 0.8 mg. of bromocriptine. Each tablet contains the following inactive ingredients: lactose, corn starch, magnesium stearate, colloidal silicon dioxide, and citric acid.

What are the possible side effects of Cycloset (Cycloset)?

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 this medicine and call your doctor at once if you have a serious side effect such as:

  • vision problems, constant runny nose;
  • chest pain, pain when you breathe, fast heart rate, rapid breathing, feeling short of breath (especially when lying down);
  • back pain, swelling in your ankles or feet, urinating less than usual or not at all;
  • confusion, hallucinations, feeling like you might...

Read All Potential Side Effects and See Pictures of Cycloset »

Last reviewed on RxList: 3/17/2017
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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