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Liquid dosage forms are designed to provide the maximum therapeutic response in a target populationwith difficulty swallowing tablets and capsules and/or to produce rapid therapeutic effects.Liquid dosage forms are either, internal, parental or external use. They are available in monophasic andbiphasic forms. Monophasic liquid dosage forms are true or colloidal solution. Water is mainly used as asolvent for majority of monophasic liquid dosage forms. The liquid which consists of two phases areknown as biphasic liquids.
Classification
Pharmaceutical liquid preparation can be classified mainly into two major class based on their site ofapplication; Internal or external
Internal Liquids: Oral Liquid preparations (Syrups, Elixirs, Linctus, Drops, Injectables, and Dialysissolutions.
External Liquids: Liquid to be applied to the skin: Liniments and lotions. Liquids meant for bodycavity: Gargles, throat paints, mouth washes, eye drops, eye lotions, ear drops, nasal drops, spraysand inhalations
Also based on routes of administration, Liquid preparations can be either sterile or non-sterile
Parenteral Medications: Sterile products administered by injection or infusion in order to bypass thegastrointestinal tract. Administration involves the use of a needle to penetrate the skin.
