Comments I'm not sure but I wouldn't think it would be a good idea to be taking weight loss pills at all while ttc. It probably wouldn't stop you from conceiving but it may be harmful to the fetus. I would google exactly what you are taking and it will tell you all of the risk and side affects. No, it is not a good idea to take ANY weight loss medications while TTC or Pregnant. If you are wanting to lose weight, i would try to accomplish that before getting pregnant and adding on any additional weight. Please check the following website for more info on this drug and what "Class" it is in. I don't think it is wise to take that powerful drug once you have conceived. Many websites make it clear that you should not take the drug if you are pregnant or in the process of becoming pregnant. You can always check with your physician but it should be noted that "patients must be not use this drug if diagnosed pregnant or intending to become pregnant"