An administrative agency like respondent possesses quasi-legislative or rule-making power or the power to make rules and regulations which results in delegated legislation that is within the confines of the granting statute and the Constitution, and subject to the doctrine of non-delegability and separability of powers.⁷⁸ Such express grant of rule-making power necessarily includes the power to amend, revise, alter, or repeal the same.⁷⁹ This is to allow administrative agencies flexibility in formulating and adjusting the details and manner by which they are to implement the provisions of a law,⁸⁰ in order to make it more responsive to the times. Hence, it is a standard provision in administrative rules that prior issuances of administrative agencies that are inconsistent therewith are declared repealed or modified.

G.R. No. 173034 October 9, 2007

PHARMACEUTICAL AND HEALTH CARE ASSOCIATION OF THE PHILIPPINES, petitioner,
vs.
HEALTH SECRETARY FRANCISCO T. DUQUE III; HEALTH UNDER SECRETARIES DR. ETHELYN P. NIETO, DR. MARGARITA M. GALON, ATTY. ALEXANDER A. PADILLA, & DR. JADE F. DEL MUNDO; and ASSISTANT SECRETARIES DR. MARIO C. VILLAVERDE, DR. DAVID J. LOZADA, AND DR. NEMESIO T. GAKO, respondents.