Topic of the Week! Weight Loss Facts! Anti Thyroid Drugs (ATD) like Tapazole (TPZ), Methimazole (MMI), Carbimazole (CBZ), Neo Marcazole (NEO) and Propylthiouracil (PTU) do NOT cause weight gain. Read that again! We typically gain weight once starting and during the course of using anti thyroid meds because we’re slowing our thyroids (and thus metabolism) […]