Have to say a big thank you! Pharmacy just changed my Thyroxin from Actavis to Mercury Pharma. I took it for 3 days and every day I was having headaches, dizziness, itchy skin, generally feeling tired and yuk! I googled Mercury Pharma and your site came up with many fellow sufferers having similar side effects. So I rang my pharmacist and explained. He told me to call in and exchange them no quibble. If I hadn't googled it I might never had known! Thankyou!