I was off Tapazole for 9 days after I got some sores in my mouth. Labs the same day showed the white cell count to be within normal limits, which is good, because mouth sores on this drug can point to "agranulocytosis," a type of low white count that can be fatal. I expected to be put back on Tapazole or switched to propylthiouracil (PTU) on visiting the doctor again.
And so last Wednesday I started Tapazole again—and promptly got a mouth ulcer two days later. So I looked up my total white blood cell count (WBC) on my clinic's web site, just to see how "normal" it had been.
Well, the latest WBC had been within normal limits, but it had been down to 5 thousand, when my last three WBC had averaged 9 thousand. I'm not sure the busy endo appreciated that, since he told me he had been known to stop people on Tapazole with only a "slight drop" in their WBC. So I stopped the Tapazole and called again today.
Now the plan is to switch to PTU 50 mg PO bid, and have a lab drawn as planned on 3-11. 100 mg a day is a rather low maintenance dose. I see that one common side effect is whitening of the hair. Cool. Not.
Who knows if this was just a run-of-the-mill canker sore, or what, but with the potential for disaster so high, nobody, including me, wants to take chances. The fact that I almost never get canker sores and then got a third one within 2 days of resuming Tapazole is a little more suggestive of a true problem.
The rather unsubtle moral of this story is to be your own best advocate, especially with someone like an endocrinologist, a type of specialist in short supply and great demand. Mine was too busy to spot a trend in my WBC that may have been significant.
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