Side Effects & Safety When taken by mouth: Huperzine A is POSSIBLY SAFE for adults when taken for less than 6 months. It can cause some side effects including nausea, diarrhea, vomiting, dry mouth, constipation, sweating, blurred vision, slurred speech, fainting, restlessness, loss of appetite, cramping, inability to control urination, high blood pressure, dizziness, inability to sleep, and slowed heart rate. Special Precautions & Warnings: Pregnancy and breast-feeding: There isn't enough reliable information to know if huperzine A is safe to use when pregnant or breast-feeding. Stay on the safe side and avoid use.



Children: Huperzine A is POSSIBLY SAFE in children when taken by mouth for less than one month.



Slow heart rate or other heart diseases: Huperzine A can slow the heart rate. This might be a problem for people who already have a slow heart rate or other heart conditions. If you have heart disease, use huperzine A cautiously.



Seizure disorder (epilepsy): Since huperzine A seems to affect brain chemicals, there is concern that it might make epilepsy worse. If you have a seizure disorder such as epilepsy, use huperzine A cautiously.



Gastrointestinal (GI) tract blockage: There is a concern that using huperzine A might make GI blockage worse. That is because huperzine A can increase mucous and fluid secretions in the intestine, causing "congestion." If you have a GI tract blockage, check with your healthcare provider before you use huperzine A.



Stomach ulcers: There is a concern that using huperzine A might make stomach ulcers worse. That is because huperzine A can increase mucous and fluid secretions in the stomach and intestine, causing "congestion." If you have stomach ulcers, check with your healthcare provider before you use huperzine A.



Lung conditions such as asthma or chronic obstructive pulmonary disease (COPD): There is a concern that using huperzine A might make asthma or COPD worse. That is because huperzine A can increase mucous and fluid secretions in the lung, causing "congestion." If you have asthma or COPD, check with your healthcare provider before you use huperzine A.



Urinary tract or reproductive system blockage: There is a concern that using huperzine A might make blockage of the urinary or reproductive system worse. That is because huperzine A can increase mucous and fluid secretions in these organs, causing "congestion." If you have a urinary tract or reproductive system blockage, check with your healthcare provider before you use huperzine A.



