Jody,
Bactrim is very commonly given to aplastic anemia patients. My wife was on it for years. There are dozens and dozens of possible side effects of Bactrim but from what I know its benefits strongly outweigh any possible hematologic effects. I know you have a number of concerns about Trevor's care and this is one I wouldn't worry about.
Only if he has a direct reaction to Bactrim would I expect the doctor to consider switching antibiotics.
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