A wide variety of dosage forms are used for the oral administration of drugs to humans
and animals. Apart from solid dosage forms, it also includes liquid dosage forms, such as solutions,
suspensions, and emulsions. The selection is based on the physiochemical attributes of the therapeutically
active ingredient. Suspensions are classified as dispersed systems that are heterogeneous in
nature and consist of two phases. One phase is the continuous phase, the dispersion medium, or the
external phase, which is either liquid or semisolid; the other is a solid particle dispersed in the external
phase and called an internal or dispersed phase. They have several advantages over other dosage
forms, such as effectively delivering hydrophobic drugs, avoiding the need for cosolvents,
masking unpleasant tastes, and providing resistance to degradation and easy swallowing for young
or elderly patients. They also attain higher drug concentrations compared to solution forms. This
review article aims to study and explore the advantages, novel suspending agents, patent preference,
and innovations of pharmaceutical suspension. It was targeted to scrutinize the literature floating in
the internet domain regarding pharmaceutical suspension for delivery of drugs by oral route. The
literature survey is targeted at the novel herbal suspending agents used, their patents involved, and
innovations in the dosage form. Further, the study gives an insight into various aspects of suspension,
such as classification of suspension, theories of suspension, various components used in suspension
formulation, formulation aspect of suspension, evaluation parameters of suspension, patents,
innovations, and regulatory status.
