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Skelaxin may cause an upset stomach, heartburn, constipation, headache, dizziness or drowsiness the first few days as your body adjusts to the medication. If these symptoms persist contact your physician. Inform your doctor if you develop: persistent stomach pain, skin rash, itching, rapid heart rate, yellowing of eyes or skin. In the unlikely event you have an allergic reaction to this drug, seek immediate medical attention. Symptoms of an allergic reaction include: rash, itching, swelling, dizziness, trouble breathing.

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