Herceptin and Pregnancy

As a pregnancy Category D medication, Herceptin may not be safe for women who are expecting. It is believed that the drug could increase the risk of low amniotic fluid. However, your healthcare provider may still prescribe this medicine if the benefits outweigh the risks.

Herceptin and Pregnancy: An Overview

Herceptin® (trastuzumab) is generally considered unsafe for women who are pregnant. In animal studies that looked at the effects of Herceptin during pregnancy, the drug did not cause any problems.
 

Herceptin and Pregnancy Category D

The U.S. Food and Drug Administration (FDA) uses a pregnancy category system to classify the possible risks to a fetus when a specific medicine is taken during pregnancy. Pregnancy Category D is a classification given to medicines that have been shown to present a risk to the fetus in studies of pregnant women but may still offer benefits that outweigh the risks the drug presents.
 
Herceptin appears to increase the risk of low amniotic fluid in pregnant women. In many cases, amniotic fluid increased once Herceptin was stopped. In one case, the low amniotic fluid recurred after Herceptin was started again (this strongly suggests that the problem was caused by Herceptin). There have been reports of serious problems (such as underdeveloped lungs, skeletal problems, and even death) due to low amniotic fluid when women took Herceptin during pregnancy.
 
Pregnancy Category D medicines (including Herceptin) may still be given to a pregnant woman if the healthcare provider believes that the benefits to the woman outweigh the possible risks to the unborn child. Dealing with (and treating) cancer in pregnant women is a difficult situation, often without any clear answers. Your healthcare provider can help you think through the various treatment options you may have.
 
Women who take Herceptin during pregnancy should be monitored for low amniotic fluid.
 
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