I don't really like how this says hupA is possibly safe if used for short periods yet gives no info on what sides long term use can cause:
Huperzine A is POSSIBLY SAFE when taken by mouth for a short period of time (less than 3 months). It can cause some side effects including nausea, diarrhea, vomiting, sweating, blurred vision, slurred speech, restlessness, loss of appetite, contraction and twitching of muscle fibers, cramping, increased saliva and urine, inability to control urination, high blood pressure, and slowed heart rate.
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Huperzine A is POSSIBLY SAFE when taken by mouth for a short period of time (less than 3 months). It can cause some side effects including nausea, diarrhea, vomiting, sweating, blurred vision, slurred speech, restlessness, loss of appetite, contraction and twitching of muscle fibers, cramping, increased saliva and urine, inability to control urination, high blood pressure, and slowed heart rate.
WebMD -- Error 404