Popular anti-anxiety medication could be putting more than 1 million pregnant women at risk of miscarriage, a new study suggests.

Researchers from Taiwan studied more than 3 million pregnancies in 2 million women and found 4.4 percent - or 136,130 - resulted in miscarriages.

They analyzed the medical history of all the women studied, and found those prescribed a class of drug called benzodiazepines - used to treat anxiety, depression and insomnia - were, on average, 70 percent more likely to miscarry compared to those who didn't take the pills.

Benzodiazepines, also called benzos, are a group of sedative drugs. The most well known medications include Xanax, Valium, Ativan and Klonopin.

Poster Comment:

Anti-depressants work by cutting back on O2. Not good for an unborn baby.