Which dosage form is a dry solid that yields a suspension when reconstituted with a suitable vehicle?

• A. Injectable Suspension
• B. Powder for Injection
• C. Lyophilization
• D. Powder for Injectable Suspension

Answer: (D)

The key idea here is a dry solid that, after mixing with a suitable liquid, forms a suspension for injection. A powder for injectable suspension is formulated so that once you reconstitute it, the drug particles remain dispersed in the liquid, creating a suspension rather than a clear solution. The label explicitly communicates that the product is a powder that will become an injectable suspension when prepared.

Injectable suspension is already a liquid dispersion, not a dry solid. Powder for injection describes powders intended to form a solution upon reconstitution, not a suspension. Lyophilization is a drying process; the resulting product could be a powder, but the specific dosage form name that guarantees a suspension after reconstitution is powder for injectable suspension.