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A pharmaceutical suspension is a coarse dispersion in which insoluble particles, generally greater than 1 µm in diameter, are dispersed in a liquid medium, usually aqueous.

An aqueous suspension is a useful formulation system for administering an insoluble or poorly soluble drug. The large surface area of dispersed drug ensures a high availability for dissolution and hence absorption. Aqueous suspensions may also be used for parenteral and ophthalmic use, and provide a suitable form for the applications of dermatological materials to the skin.
An acceptable suspension possesses certain desirable qualities, among which are the following:

  • the suspended material should not settle too rapidly;
  • the particles that do settle to the bottom of the container must not form a hard mass but should be readily dispersed into a uniform mixture when the container is shaken; and
  • the suspension must not be too viscous to pour freely from the bottle or to flow through a syringe needle.

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