The present invention concerns a pharmaceutically-acceptable salt of a compound of the following formula (I):H2N-CH(R1)-CH2-S-S-CH2-CH(R2)-CONH-CH(R3)-COOR4(I)and more particularly, an acid addition salt thereof, and compositions containing them, for use to prevent or treat trigeminal nerve pains, in particular migraine or trigeminal neuralgia.本發明係關於用於預防或治療三叉神經痛(trigeminal nerve pain),特定言之偏頭痛或三叉神經痛(trigeminal neuralgia)的以下式(I)化合物之醫藥學上可接受之鹽:H2N-CH(R1)-CH2-S-S-CH2-CH(R2)-CONH-CH(R3)-COOR4(I)且更特定言之,其酸加成鹽及含有該等鹽之組成物。