The illustrated embodiments of the invention include an MRI compatible apparatus having: a refillable drug reservoir; a hermetically sealed, implantable chamber; a pump disposed in and hermetically sealed within the hermetically sealed, implantable chamber and fluidically communicated to the drug reservoir; and control electronics disposed in and hermetically sealed within the hermetically sealed, implantable chamber and electrically communicated to the pump. The refillable drug reservoir, hermetically sealed, implantable chamber, pump and control electronics are MRI compatible.