Brigham and Women’s Faulkner Hospital is modifying its plan to close an inpatient drug and alcohol detoxification unit, after the proposal drew heavy criticism from patients, hospital staff, and mental health advocates who said the state has too few such specialized facilities and the change could harm patients.

The hospital had planned to reserve six beds on a medical floor for people with addictions to help offset the beds lost in the closure. In negotiations with the state Department of Public Health, executives have agreed to increase that number to nine and to continue many of the therapeutic services that have been part of the separate unit.