![]() Classification based on the size of solid particlesġ.Classification based on electrokinetic nature of solid particles. ![]() Classification based on the concentration of the dispersed phase.Classification based on the route of administration (general classes).Suspensions can be classified in various ways and these include ![]() The suspension must dry quickly and provide an elastic protective film that will not rub off easily.The product must be fluid enough to spread easily over the affected area but not so fluid that it runs off the surface too quickly.Parenteral suspensions should be isotonic and non‐irritating.Parenteral and ophthalmic suspensions should be sterilizable and syringable (for parenteral suspensions).Suspended particles should settle slowly and the sediment or creaming produced on storage, if any, should readily redisperse upon gentle shaking of the container.The drug substance must not recrystallize and/or change its polymorphic form during storage.All the doses dispensed from a given multi-dose container should have acceptable uniformity of drug content.Suspensions must not be too viscous to pour freely from a bottle or to flow through a needle syringe (for injectable suspensions).The product must remain sufficiently homogenous for at least the period between shaking the container and removing the required amount.Suspended particles should be small and uniformly sized in order to give a smooth, elegant product free from a gritty texture.Pharmaceutical suspension should be aesthetically pleasing and should also have a pleasing odour, and taste.The final product should be physically, chemically and microbiologically stable.Classification of suspension based on the size of solid particles Classification of suspension based on electrokinetic nature of solid particles Classification of suspension based on the concentration of the dispersed phase Parenteral suspension/ injectable suspensions Externally applied suspension/ Topical suspensions Classification of suspension based on the route of administration (general classes) ![]()
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