The present invention describes the use of a 5HT3-antagonist, in combination with a 6-propylamino-4,5,6,7-tetrahydro-1,3-benzothiazole-2-amine, to reduce adverse effects and to facilitate the neuroprotective treatment of a patient suffering from a synucleinopathic disorder to enable a therapeutically effective 6-propylamino-4,5,6,7-tetrahydro-1,3-benzothiazole-2-amine daily dose without the dose-limiting adverse effects caused by pramipexole when administered alone.
