Phentermine and Pregnancy

No studies have been conducted on phentermine and pregnancy, so it is not known whether the medication is safe to use during pregnancy. Since phentermine is chemically related to amphetamines, which have been shown to cause miscarriages and birth defects, it may not be safe for pregnant women. If you are taking phentermine and pregnancy occurs, be sure to let your healthcare provider know.

 

An Overview of Phentermine and Pregnancy

Phentermine is a prescription weight-loss aid. Since phentermine has not been studied in any pregnant animals or women, it is not known if it is safe for use during pregnancy.
 

Phentermine and Pregnancy Category C

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 C is given to medicines that have not been studied in pregnant humans but do appear to cause harm to the fetus in animal studies. Also, medicines that have not been studied in any pregnant women or animals are automatically given a pregnancy Category C rating.
 
Phentermine has not been studied in any pregnant women or animals. There have been a few reports of lung problems and stillbirths possibly related to phentermine use during pregnancy. Also, phentermine is chemically related to amphetamines, a group of drugs that has been shown to increase the risk of birth defects and miscarriages.
 
Since it is not known if phentermine is safe during pregnancy (and since taking phentermine is not absolutely necessary), phentermine is not recommended for pregnant women in general.
 

Phentermine and Pregnancy: Final Thoughts

If you are pregnant, it is always a good idea to ask your healthcare provider before taking any medication. Phentermine should probably not be taken during pregnancy. If you are concerned about your weight during pregnancy, please discuss this with your healthcare provider.
 
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Written by/reviewed by: Kristi Monson, PharmD; Arthur Schoenstadt, MD
Last reviewed by: Kristi Monson, PharmD;