Botox from Allergan is used to relax muscles. Typically physicaians speak about areas or number of units used. Botox is available in bottles of 100 units and beed to br reconstiituted and refrigerated. Botx can be used on the forehead, between the eyebrows, to lift the outer eyebrow, for crows feet, bunny lines, on the lip, to release the corner of the mouth and relax the chin. off the face it can be used for the neck, chest, and for relief of migraines.