birth control pill and synthroid

I was diagnosed hypothyroidism two days ago. The doctor prescribed synthroid to me but when I confirmed that I do take birth control pills, he decided not to give me this medicine. Why? Did anybody have any problems with this drug while being on BC pills? All replies welcome!!

Hi! I haven’t had any problems but my doctor told me the same thing. Supposedly BC pills can decrease synthroid’s effect. I got off BC pills, and then started taking synthroid. Have been on it for 2 years now.

I have taken bc s and synthroid for 3 years together and I have not gained weight or gotten pregnet.

It is actually the effectiveness of the BC that is decreased. I take both (actually I use a BC patch), but when I was on the pill my doctor said to take BC in the morning and synthroid at night so as to increase how effective each would be.

hmmmm, I don't know what's up with that. I have been taking bc pills and synthroid now for 9 months and I haven't gotten pregnant or had any additional thyroid issues. My doc has gone over my blood test results with me, and my T4 was a little high (not abnormal, just on the high side) and he said that was expected because I was on the BC pills. He didn't say why...and I didn't ask because I feel better now that I have in years. I guess each doctor is different!