1. The dispersed particles should settle slowly and should redisperse immediately on shaking.
2. The product should remain sufficiently homogenous for at least the period between shaking the container and removing the required dose.
3. The viscosity of the suspension should be such that it can be easily removed from the container and transferred to the site of application without any difficulty.
4. The sediment produced on standing should not form a hard cake.
5. Any suspended particles should be small and uniformly sized in order to give a smooth, elegant product free from grittiness.
6. The suspension should be physically and chemically stable during handling and storage conditions.
7. It should have good syringibility in case of parenteral suspensions.
8. It should produce thixotropic property (gel to sol upon shaking and sol to gel during storage).

Advantages of Suspensions

1.  Insoluble drugs may be made more palatable.
2. Insoluble drugs may be prepared in a more stable manner.
3. Suspended insoluble powders are easy to swallow.
4. Suspensions enable easy administration of bulk insoluble powders.
5. When compared to solid dosage forms, absorption is faster.
6. Lotions will leave a cooling layer of medicament on the skin.
7. It can be formulated for both immediate and sustained drug release preparations.

Disadvantages of Suspensions

1. Suspensions require shaking before use, to ensure uniformity of dose.
2. If the preparation is not shaken well, the accuracy of dose is likely to be less when compared to solutions.
3. Improper storage conditions can affect the disperse system.
4. Since suspensions are stored in glass or plastic containers, they are bulky, difficult to transport and prone to container breakages.