I had been taking plaquenil 200mg hydroxychloroquine sulphate for many years, when switched to a quinoric version I was unwell. The Dr said to make sure Plaquenil was requested. I have just tried to put a repeat prescription through and Plaquenil is no more. I was offered quinoric, which I can't take. I have done some investigation and found out that Zentiva have taken over the plaquenil brand, my chemist can't seem to get hold of this make and had got Black Rock. Is there anyone who couldn't take other brands of hydroxy chloroquine as it caused stomach problems? What have you done and have any of you used Black Rock? I am really worried as I only have enough plaquenil to last till Thursday. Thank you.