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My doctor had me take this for a month to rule out a mechanical issue with my esophagus vs. acid reflux. After taking it for a month, I developed intense chest pain accompanied with shortness of breath and dizziness. This happens daily when I get out of bed in the morning, or when I try to take a brisk walk, any time my heart rate rises a bit. It has been a year now. I can't really exercise much. I used to love going for walks but now I can only walk a short distance. This side effect is not in the medical literature I might be a rare case, but I just want to make people aware that this happens. At the very least, follow the instructions and do NOT take this for more that 14 days. I currently am prescribed 2 Pepcid twice a day, which works pretty well for the acid reflux. If the Pepcid doesn't work, I'd suggest going to the doctor before trying this.