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Myrbetriq and Pregnancy

As a pregnancy Category C medication, Myrbetriq (mirabegron) may not be safe for pregnant women. Although research has not been adequately done in such women, the medication has been shown to cause miscarriages, reduced fetal weights, and fetal bone problems when given to pregnant animals. However, there may be situations when the benefits of using the drug outweigh the possible risks to the unborn child.

Can Pregnant Women Take Myrbetriq?

Myrbetriq™ (mirabegron) is a prescription medication used to treat an overactive bladder. Based on the results of animal studies, it may not be safe for pregnant women to take Myrbetriq.

What Is Pregnancy Category C?

The U.S. Food and Drug Administration (FDA) uses a category system to classify the possible risks to a fetus when a specific medicine is taken during pregnancy. Myrbetriq is classified as a pregnancy Category C medication.
Pregnancy Category C is given to medicines that have not been studied in pregnant humans but do appear to cause fetal harm in animal studies. Also, medicines that have not been studied in any pregnant women or animals are automatically given a pregnancy Category C rating.
Myrbetriq has not been adequately studied in pregnant women; however, it has been studied in animals.
When given in doses high enough to cause harm to pregnant rats and rabbits, it decreased fetal body weights. The drug also delayed fetal bone formation when given to pregnant rats in very high doses (at least 22 times the maximum recommended human dose). However, the effects on bone were not permanent. At doses that were high enough to harm the pregnant rabbits, Myrbetriq increased the risk for miscarriage and heart problems (an enlarged heart and aorta).
It is important to note, however, that animals do not always respond to medicines in the same way that humans do. Therefore, a pregnancy Category C medicine may be given to a pregnant woman if her healthcare provider believes that the benefits to the woman outweigh any possible risks to the unborn child.
Pregnancy and Pain

Myrbetriq Medication Information

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