Which equipment is designed to protect users from exposure to hazardous drugs or vapors?

The correct choice is a closed system transfer device (CSTD), which is specifically engineered to mitigate exposure to hazardous drugs and vapors for users who handle these substances. CSTDs create a sealed environment to prevent the release of potentially harmful drugs into the environment during the transfer process from one container to another, such as from a vial to a syringe. This not only protects healthcare workers from inhaling or coming into contact with toxic substances but also helps maintain the sterility of the drug being transferred.

In comparison, items like sterile filter straws, transfer sets, and regular syringes do not have the design features required to ensure that hazardous materials are contained throughout the medication transfer process. Regular syringes and transfer sets can expose users to hazardous drugs if not handled properly, as they lack the sealed mechanism that CSTDs employ. Sterile filter straws might serve specific purposes in medication administration or liquid handling but do not offer the necessary protections against hazardous drug exposure.