|Misai Kucing (Orthosiphon staminaeus)|
Orthosiphon staminaeus is a herbaceous plant (up to 1.5m h) bearing campanulate whitish-bluish flowers with long exerted filaments (giving its namesake "cat's whiskers"). The leaves are in opposite pairs with lanceolate blade and serrate margin. It is grown both for its medicinal and aesthetic values.
Two main ethnic use of this plant are for its diuretic and anti hypertensive effects. Several studies have given some insights into these traditional claims. The lyophilized extract enhanced ion excretion in rats1, and in a clinical trial in Thailand, the extract was shown to increase citrate and oxalate excretion in man suggesting a potential use in reducing kidney stones.2 Methylripariochromene A isolated from O. staminaeus were shown to decrease systolic blood pressure and increase the excretion of Na+, K+, and Cl- in rats.3