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 22th
2009
11:54 AM
I was on keflex 500 mg every 8 hours. After four doses, I experienced dizziness, difficulty breathing and syncope. I also had palpitations, high blood pressure, ice cold hands & feet and continued to have dizzy spells while lying flat on my back. None of the labs done in the ER could explain this. It's the keflex. I have taken penicillin before without any adverse reaction. I will never take Keflex again.
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