Classification And Type Of Pharmaceutical Mixture

Pharmaceutical mixtures are liquid preparation meant for oral administration in which medicament or medicaments dissolved, suspended or dispersed in a suitable vehicle. They are extemporaneous preparation for immediate use. They are prescribed for acute conditions like cough and not for chronic conditions like tuberculosis. The label always carries 'shake well' and must be used within a month.

Pharmaceutical mixtures

Classification Of Mixture

There are different types of pharmaceutical mixtures represented by this classification.

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1. Simple Mixture Containing Soluble Substances

It contains only soluble ingredients and is represented by a true solution. It is a clear homogeneous mixture.

2. Mixture Containing Diffusible Solids

Diffusible solids are those which do not dissolve in water but upon shaking the powdered drug is evenly diffused throughout liquid and remain distributed uniformly for sufficient time. No need for suspending agents.

3. Mixture Containing Indiffusible Solids

Indiffusible solids are not soluble in water and do not remain uniformly distributed in vehicles for sufficient time. Therefore suspending agents are added to suspend a drug.

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4. Mixture Containing Precipitate Forming Liquids

Certain liquid preparations contain liquid containing resin (resinous matter). When mixed with water, resin is precipitated which may adhere to the sides of the bottles or form a clotted precipitate. This will not re-diffuse upon shaking. To prevent this, suspending agents are used.

5. Mixture Containing Slightly Soluble Liquid

Slightly soluble liquid is not readily diffusible. So a suspending agent is added to disperse such a mixture.