Acute reduction and long-term improvement of chorea with ceruletide (cholecystokinin analogue).

We studied the effects of ceruletide, a cholecystokinin analogue, on choreic involuntary movement in several neurological diseases by clinical scoring and electromyography in 11 patients. Ceruletide brought about a brief reduction of choreic movement reaching its maximum within 60 min and another long-lasting improvement over several weeks by single administration. The levels of homovanillic acid in cerebrospinal fluid before treatment were significantly higher in cases with long-lasting improvement than those in cases without improvement. We suggest that ceruletide may reduce choreic movement for a long period through effects on the central dopamine system and speculate that such a long-term effect may be accounted for by the change in transmission after the second messengers in neurons.