moisture and contamination as well as convenience of application. Currently some foot powders and
talcum powders have been marketed as pressure aerosols.
Dusting powders are employed chiefly as lubricants, protectives, absorbents, antiseptics,
antipruritics, astringents and antiperspirants.
Zinc oxide 20 parts Salicylic acid 2 parts Starch powder 78 parts
(b) Snuffs:
These are finely divided solid dosage forms of medicaments dispensed in flat metal boxes with
hinged lid. These powders are inhaled into nostrils for decongestion, antiseptic, and bronchodilator
action.
(c) Douche powder:
These powders are intended to be used as antiseptics or cleansing agents for a body cavity;
most commonly for vaginal use although they may be formulated for nasal, otic or ophthalmic use also.
As douche powder formulation often include aromatic oils, it becomes necessary to pass them through a
# 40 or 60 sieve to eliminate agglomeration and to ensure complete mixing. They can be dispensed
either in wide mouth glass bottles or in powder boxes but the former are preferred because of
protection afforded against air and moisture.
Zinc sulphate
Magnesium sulphate
Boric acid
Oil of lemon
Water
(d) Dental powders:
Dental powders are rarely prescribed. However this class of powders is interesting from the
compounding angle. This preparation is a type of dentifrice meant for cleaning the teeth.
As such, dental powders contain detergents, abrasives, antiseptics and colouring and flavouring
agents incorporated in a suitable base. Generally the base is calcium carbonate. The detergent is in the
form of soap and the abrasive action is provided by finely powdered pumice stone.
Essential oils are added to provide flavour and freshness to the mouth as well as antiseptic
action. Essential oils, if present in smaller quantity, are easily absorbed by calcium carbonate and
pumice. This makes the uniform distribution of the oil difficult. Best results are obtained if the oil is
triturated in the solids taking considerable care to distribute it uniformly.
(e) Insufflation:
Insufflations are a class of powders meant for application to the body cavities e.g., ear, nose,
vagina etc. The powder has to be extremely fine and must find an entry to the cavity deep enough to
bring about its action at the site. It is delivered to the affected part in a stream with the help of a device
called an insufflator, which blows the powder to the site.