“The … magnesium (20 … by flumazenil (10 mg/kg) (benzodiazepine receptor antagonist) while combined treatment with the non-effective doses of magnesium (10 mg/kg) and benzodiazepines (diazepam (…) or chlordiazepoxide (2 mg/kg)) produced synergistic interaction (increased time in open arms and number of open arm entries) in this test.”