Is it safe to take levothyroxine and diet pills such as Phenq?

I have never heard of that particular supplement, but from what I have read in the past regarding levothyroxine is that so long as you take it in the morning without anything that could possibly interfere with its absorption, like eating before the 1/2 hour after taking it, taking it with estrogen supplement or flaxseed oil supplement it should not cause a problem. It is always best to seek out the advice of a physician first. Keep in mind that if you just found out your thyroid is low and you had gained weight because of that, then you will naturally lose some of that weight simply by taking the levothyroxine which will boost your metabolism since it was low before.