Arieli levothyroxine is only taken if your normal production by your thyroid gland isn't upto par. Her main health concern is her thyroid hormone production level. By taking levothyroxine, she is balancing her thyroid level. And yes i understand that she is taking other products for her weight loss, but please understand that with a thyroid problem, weight gain is normal. She needs to first focus on bringing her thyroid values on a normal scale. And only when they are constant, should she focus on weight loss pills. Weigh loss pills alter your hormones and it NOT recommended to take hormonal drugs with levothyrosine as it will reduce the affect of levothyroxine and will also cause hypertension along with severe tachycardia.