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While you're taking the prescription weight-loss drug Qsymia (phentermine and topiramate), you should call your doctor right away if you have any symptoms of an allergic reaction, such as:
- hives or itching
- difficulty breathing
- swelling of your face, mouth, throat or tongue
- suicidal thoughts, depression or other mood changes
- changes in vision
- difficulty concentrating or remembering
- confusion
- problems with speech
- loss of appetite
- unusual weakness or fatigue
- fast or irregular heartbeat
- low blood sugar
- kidney stones
- chest pain or chest tightness
- difficulty breathing
- vomiting
- a change in your period (if you take birth control pills)
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