Below is an instruction from Human. Write a response.
    ### Instruction:
    What causes Prolactinoma ?
    ### Response:
    In some people, high blood levels of prolactin can be traced to causes other than prolactinoma.
                
Prescription drugs. Prolactin secretion in the pituitary is normally suppressed by the brain chemical dopamine. Drugs that block the effects of dopamine at the pituitary or deplete dopamine stores in the brain may cause the pituitary to secrete prolactin.
    