This registry is a place to share positive or negative side effects of using Keflex. If you directly experienced a side effect while using Keflex, then we encourage you to enter it here. Please note that entries here are the experiences of individual users, and in no way means that you or anyone else will experience the same side effect, since the same medication affects people in different ways. Please always contact your physician.
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March 13th
2005
9:33 AM
I was prescribed Keflex, 500mg, 3 times a day for pre-root canal procedure by my dentist. I took a total of 3 pills and experienced SEVERE migraine headaches and nausea. Keflex made me extremely ill. My pharmacist told me to stop taking them and my dentist prescibed a different antibiotic. I will NEVER take that antibiotic again!!!!!
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