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Nitro-Dur and Pregnancy

If you are pregnant, Nitro-Dur (nitroglycerin patch) may not be the best angina medication, as the full risks are unknown. Although animal studies on the active ingredient in the drug did not result in any problems in the offspring, humans do not always respond to medicines in the same way that animals do. Therefore, Nitro-Dur should be prescribed during pregnancy only if the benefits outweigh the risks.

Can Pregnant Women Use Nitro-Dur?

Nitro-Dur® (nitroglycerin patch) is a prescription skin patch approved for the prevention of chest pain (angina). Based on the information currently available, it is unclear if the drug is safe for use during pregnancy.
 

What Is Pregnancy Category C?

Nitro-Dur is classified as a pregnancy Category C drug. 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. Pregnancy Category C is given to medicines that have not been adequately studied in pregnant humans but have caused fetal harm in animal studies.
 
In addition, medicines that have not been studied in any pregnant women or animals are automatically given a pregnancy Category C rating.
 
When given to pregnant rabbits, nitroglycerin, the active ingredient in Nitro-Dur, did not cause any problems for the mothers or the babies. However, it cannot be assumed that the same is true for humans, as animals do not always respond to medicines in the same way that humans do.
 
Therefore, a pregnancy Category C medicine, including Nitro-Dur, should only be given to a pregnant woman if her healthcare provider believes that the benefits to her outweigh any possible risks to her unborn child.
 
Various forms of nitroglycerin have been used to control high blood pressure during pregnancy. This drug has also been used to help stop preterm labor by relaxing the uterus. It is unknown if Nitro-Dur would be safe or effective for these uses.
 
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Nitro-Dur Medication Information

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