sterilized by autoclaving or maintaining at 90 100 u00b0 c for half an hour alternatively the solution may be sterilized by filtration and transferred to the container by an aseptic technique examples of bactericidal and fungicidal agents suitable for inclusion in the drops are phenylmercuric nitrate or acetate 0 002 benzalkonium chloride 0 01 and chlorhexidine acetate 0 01 suitable solvents for the preparation of an oily solution include glycerol diluted alcohol and propylene glycol lotions according to the present invention include those suitable for application to the skin or eye an eye lotion may comprise a sterile aqueous solution optionally containing a bactericide and may be prepared by methods similar to those for the preparation of drops lotions or liniments for application to the skin may also include an agent to hasten drying and to cool the skin such as an alcohol or acetone and or a moisturizer such as glycerol or an oil such as castor oil or arachis oil creams ointments or pastes according to the present invention are semi solid formulations of the active ingredient for external application they may be made by mixing the active ingredient in finely divided or powdered form alone or in solution or suspension in an aqueous or non aqueous fluid with the aid of suitable.