“The combined … of ZnCl2 (1 mg/kg) with sub-effective …/kg), paroxetine (0.1 mg/kg), desipramine (0.1 mg/kg), imipramine (0.1 mg/kg) or bupropion (1 mg/kg) induced a … time in the TST when compared with the groups treated with ZnCl2 or with antidepressants alone.”