Risk level in pregnancy: This medicine is classified as Category X.
It is not available enough documentation on the effects of phentermine in humans and no studies have been reported on its possible influence on experimental animals.
The lack of studies on the subject suggest should be used this medicine only if it is absolutely necessary.
Meaning of category X
Studies in animals or humans have demonstrated fetal abnormalities and/or there is positive evidence of human fetal risk based on adverse reaction data from investigational or marketing experience, and the risks involved in use of the drug in pregnant women clearly outweigh potential benefits.