• Mixtures containing indiffusible soilds :- Indiffusible soilds are those solids which are not soluble in water and do not remain uniformly distributed in the vehicle for sufficiently long time. Therefore,to suspend the drug, suspending agents are added. The commonly used Indiffusible drug in mixture form are acetylsalicylic acid, quinine salicylate, calomel, phenacetin, benzoic acid, phenobarbital etc.
source https://www.pharmatutor.org/pharmaceutics/liquid-dosage-form-2
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