Cambridge’s public health and police departments invite residents to dispose safely of unwanted prescriptions, over-the-counter meds and vitamins at a biannual medication takeback event from 10 a.m. to 2 p.m. Oct. 26 at the police department’s Robert W. Healy Public Safety Facility at 125 Sixth St., East Cambridge near Kendall Square. (It has a medication disposal kiosk in the lobby 24 hours a day, year-round; the CVS Pharmacy at 36 White St., Porter Square, is another year-round, 24-hour drop-off point).