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Hello, and thanks for writing in.
These extra doses of Simplicef should not cause a problem for Whiskey. The most common side effects, if anything, would be vomiting, diarrhea, or lack of appetite.
At this point, going back to the prescribed once a day dosing would be recommended, along with a probiotic, like you mentioned. If you do happen to see any abnormal symptoms, I would recommend contacting your veterinarian. Otherwise, she should likely be just fine.
I hope this helps. Please let me know if I can assist you and Whiskey further.