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Hi Rena, While dizziness itself is not, as far as I know, a symptom of Arimidex, it does sound like your mom is not eating, which can definitely lead to fainting spells. All cancer drugs have some side effects but some of us react more intensely to some than others. I suggest raising this issue with your mom's oncologist. There may well be a drug for which she experiences fewer side effects or perhpaps her dose could be adjusted. My oncologist puts a great deal of importance on balancing quality of life with effective treatment. Hopefully, you can work out a better balance for your mom. Take care, Laurie