Ten acromegalics, 6 females and 4 males, aged 24 to 75, have been treated with bromocriptine (CB). Six patients responded clinically to CB: two subsequently escaped control, three have been treated continuously for from 14 to 32 months, and one withdrew because of side effects. Four patients failed to respond: one at 60 mg/day, two at only 20 mg/day and the fourth at 5 mg/day when treatment was ceased because of side effects. Three patients had severe illnesses during treatment and four patients were troubled by side effects. CB is useful in the treatment of acromegaly where other modalities are unsuitable.