Acidum Boricum in large doses depresses the spinal centers and disturbs digestion. Moderate doses sometimes occasion cutaneous irritation, with ecchymosis and edema. It is employed internally in cystitis and abnormal gastric fermentations with success, but in general its internal administration should be only for short intervals. Dose, 3 to 10 grains.

Externally, it is a non-irritating and moderately effective antiseptic with a wide range of application. In ointments it is commonly made up in 5 to l0%; in aqueous solutions, I to 4%; in combination with glycerin, 5 to l0%; in eye lotions generally, 5 grains to fKi; while for styes, 15 grains to water fKi.