you can really take them at the same time. they are totally different mediations. the phenteramine is an appetite suppressant so you should take it mid-morning to help you with the lunch/dinner times. the synthroid can be taken anytime.
i am take synthroid. 75 mcgm every day my dr prescribed phentermine 37. 5 when should i take each so for best benefit? . i am not sure when to take my synthroid and when to take the phentermine so that they don't effect one another.