I am having real issues with my health and I think it may be because the pharmacy has changed my prescription as the manufacturer of the levothyroxine tablets that I am used to having was an orange and white 100 mcg packet I think my have been Activar to a smaller khaki and white packet by Northstar. Also my 25 mcg tablets used to be from Wockhardt and have been given two different brands Mercury and Teva 25mcg tablets. Has anyone else experienced this? I feel more exhausted very achey and no energy, desperate really as can not cope I feel under mededicated and want to know if I could go back to pharmacy and get my meds changed back. Has anyone else experienced adverse effects to these companies Levothyroxine?