I had a bad reaction to PTU - agranulocytosis, or no white blood cells which is very serious - so now have to decide what to do about my Graves. Obviously I'd like to avoid RAI or surgery if possible, and am wondering if I can try Tapazole or will I have the same reaction? I took Tapazole 10 years ago and did fine. The reason I took PTU this time is because I'm breastfeeding. Thanks.