This registry is a place to share positive or negative side effects of using Allegra. If you directly experienced a side effect while using Allegra, 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
2003
4:42 AM
i have expereince severe back pain and menstrual pain. In fact Allegra seems to have caused my period to linger for approximately 4 weeks. This morning the back pain is so painful that I am discontinuing the use of Allegra. I have been taking Allegra for approximately 2 months and this is the first problem I have had.
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