She had started Synthroid (also known as levothyroxine) three or four weeks earlier, and was still exhausted and gaining weight. So her first thought was that the Synthroid wasn't working.
It's common. Patients think that the medication isn't working if after a few weeks, they still have troublesome symptoms.
But if this happens to you, does this mean your medication really isn't working?
Before you make any assumptions, you should explore the following questions...