Pharmaceutical Excipient Types

Antimicrobial Preservative is used in liquid and semisolid preparations to prevent  growth of microorganisms

Examples

Benzalkonium chloride

Antifungal  preservative is used in liquid and semisolid preparations to prevent  growth of fungi. Effectiveness of parabens is usually  enhanced by use in combination

Examples

Butylparaben
Ethylparaben
Methylparaben
Benzoic acid

Air displacement agent is employed to displace air in a hermetically sealed container to enhance product stability

Examples          

Nitrogen
Carbon dioxide

Agent responsible for developing the pressure within an aerosol container and expelling the product when the valve is opened.

Examples

Carbon dioxide
Dichlorodifluoromethane

An adsorbent is an agent capable of holding other molecules onto its surface by physical or chemical (chemisorption) means.

Examples

Powdered cellulose
Activated charcoal

Alkalizing agent is used in liquid preparations to provide alkaline
medium for product stability….
Examples Ammonia solution, Ammonium carbonate, Diethanolamine, Monoethanolamine, Potassium hydroxide, Sodium bicarbonate