Suspension

Types and examples

Theory

Components of suspension

1.Particle size of the dispersed phase

2.Concentration of the dispersed phase

3.Type of the dispersion medium

4.Route of administration

5.Feature of dispersed phase

1.Oral suspensions

2.Topical suspensions lotion

3.Injectable suspensions

4.otic suspension

5.Ophthalmic suspensions

1.Suspensions containing diffusible solids

2.Suspension containing indiffusible solids

  1. Suspensions containing poorly wettable solids

4.Suspensions produced by chemical reaction

  1. The solid-liquid interface
  1. Sedimentation
  1. Solid particle interaction
  1. Crystall growth
  1. Rheology
  1. Drug : uniform particles size in the range of 1-50
  1. Components of the suspending system
  1. Components of the suspending vehicle or external phase

Wetting agents

Flocculating agents

Suspending agents

Natural plant hydrocolloids

Cellulose derivatives

Clays

Synthetic polymers

Preparation of suspensions