What is the advantage of using filter needles?

Filter needles are designed to prevent particulate matter, such as rubber or glass fragments, from being drawn into a syringe when drawing up medications from vials. This characteristic is crucial for maintaining medication safety and integrity. By using filter needles during the aspiration process, healthcare professionals can minimize the risk of introducing contaminants into the patient's bloodstream, thus ensuring a safer injection.

This functionality makes filter needles particularly essential when working with certain types of medications, especially those that come in vials sealed with rubber stoppers, where tiny pieces of the stopper may dislodge during aspiration. The use of a filter needle therefore provides added protection against potential complications that could arise from such contamination.

The other options do not accurately reflect the primary purpose of filter needles. They do not specifically enhance the speed of administration, reduce the amount of medication needed, or inherently cause less pain compared to standard needles, making option B the most relevant and accurate choice in the context of medication administration.