In which situation should a pharmacy technician use a filter needle?

Using a filter needle is important when drawing up solutions from an ampule because ampules are glass containers that can leave tiny glass particles in the liquid when opened. A filter needle has a specialized filter that captures these particles, ensuring that only the clear solution is drawn into the syringe.

When reconstructing a powdered drug or drawing up viscous liquids, there typically isn’t a risk of contamination with particles that would necessitate a filter. Moreover, when drawing liquid from a single-dose vial, it is generally safe and appropriate to use a standard needle, as such vials are not prone to particles that necessitate filtration.

Overall, the primary function of a filter needle is to remove any potential contaminants present in solutions drawn from ampules, making this the correct context for its use.