When must dispensers query the VPMS according to the adopted rules?

Dispensers are required to query the Vermont Prescription Monitoring System (VPMS) in accordance with health department regulations to ensure compliance with laws and to promote appropriate prescribing and dispensing practices. This requirement is in place to help track prescription drug use and prevent misuse or abuse of controlled substances. By adhering to health department regulations, dispensers are fulfilling their legal obligations and contributing to public health efforts aimed at reducing prescription drug misuse.

The other options present scenarios that do not align with the regulatory framework established for the VPMS. For example, querying only when a patient requests it could lead to incomplete oversight of a patient's medication history. Querying at any point in the dispensing process may not ensure that all necessary information is obtained consistently as per regulations. Limiting queries only to regulatory audits fails to promote ongoing monitoring, which is critical in identifying potential abuse or fraud. Therefore, the correct option emphasizes compliance with established health department regulations to ensure the effective use of the VPMS.