Anhydrol Forte Roll On is a clear, colourless liquid that contains no fragrance. It has the active ingredient aluminium chloride and this works by blocking the sweat glands in the area applied. This then causes the pressure of fluid within the sweat glands to rise to the point where it shuts off sweat production. It should be applied before going to bed at night and should be washed off first thing in the morning. Do not be re-apply at all during the day. Over time, the sweating will stop during the day and you can the reduce the number of times it is applied at night. This medicine should only be used on small areas i.e, the armpits, hands or feet to ensure that no detrimental effects occur from widespread blocking of pores and obstruction of sweating.