Java Tea, cautions

The diuretic properties seem to be associated with increased urinary potassium and decreased urinary sodium, which may not be a good thing for hypertensives who are not on a high potassium and low sodium diet

Contraindicated in the presence of edema resulting from reduced cardiac or renal activity.

Probably interactions with enzymes of Drug Metabolism. Appears to have a concernable inhibitory potential on CYP2D6 and CYP3A4, not yet tested in living models