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It is not known whether taking forskolin is safe, because it has not been thoroughly studied. Some negative reactions to forskolin have been reported. These include:
Flushing, fast heart beats, and low blood pressure when taken through an IV
Upper respiratory tract irritation, cough, tremor, and restlessness when inhaled
Stinging of the eyes and enlarging of the blood vessels in the eyes
People taking blood thinners or anti-platelet drugs should not take forskolin. Also, certain high blood pressure drugs may interact with forskolin, including:
Calcium channel blockers