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We don;t know why Claritin works, but it does! You need to check with the doctor to get permission. I take Zyrtec for allergies, so my oncologist said it was fine. Some people have trouble with the Neulast shot, but I didn't.
How many days will she have between chemo? She will have some normal days after she experiences the rough days. Attitude is really important so any help you can give her will be great!