SuraminReceptors, SerotoninDopamine AntagonistsExcitatory Amino Acid AntagonistsRats, Sprague-DawleyDose-Response Relationship, DrugPurinergic P2 Receptor AntagonistsReceptors, Purinergic P2Adenosine TriphosphatePyridoxal PhosphateUridine TriphosphateReceptors, PurinergicPurinergic AntagonistsPurinergic P2 Receptor AgonistsReceptors, Purinergic P2XPurinergic P2X Receptor AntagonistsPurinergic AgonistsTrypanocidal Agents