Which term describes dry solids that yield a preparation conforming to the requirements for injectable suspensions upon addition of a suitable vehicle?

• A. Powder for Injectable Suspension
• B. Powder for Injection
• C. Injectable Suspension
• D. Lyophilized Substance

Answer: (A)

The main idea here is how the final parenteral product is prepared from a dry starting material. Dry solids that are intended to be dispersed in a vehicle to form an injectable suspension are described as powders for injectable suspension. This term specifically denotes a dry powder that, when you add a suitable sterile vehicle, yields an injectable suspension that meets pharmacopeial standards for particle dispersion, sterility, and stability.

In contrast, a powder for injection is meant to produce a clear solution (not a suspension) when solvent is added, so it isn’t the right description for a material that should form a suspension. The injectable suspension is the final product you administer, not the starting material. A lyophilized substance is a general description of a freeze-dried solid and doesn’t inherently specify that it will yield a suspension upon reconstitution.