Sixteen patients with motor neuron disease received RX77368, a TRH analogue, IV, 
repeatedly over 1-12 weeks (median 2 weeks). Slight to moderate improvement in 
bulbar function, particularly speech, was reproduced or persisted with repeated 
infusions in 8 of 12 responders over a median of 18 days (range 14-90) during 
the period of study. Cramps (5/9) and spasticity (5/8) improved for a median of 
14 days (range 7-35) and 7 days (range 2-14) respectively. The highest 
benefit/side effect ratio was seen with 0.2 mg/kg (0.15 mg/kg in those with 
severe bulbar palsy) every 3-4 days. Long term studies with this analogue in MND 
are indicated.