This is what Drugs.com says about
side effects:
Less serious Flexeril side effects may include:
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dry mouth or throat;
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blurred vision;
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drowsiness, dizziness, tired feeling;
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loss of appetite, stomach pain, nausea;
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diarrhea, constipation, gas; or
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muscle weakness.
It just says to call your doctor if any of these non life threatening symptoms are bothersome.
Donna