TSPO and post-traumatic stress disorder: In addition, the anti-PTSD effects of midazolam (0.5 mg/kg, p.o.)were antagonized by the TSPO antagonist PK11195 (3 mg/kg, i.p.), the CBR antagonist flumazenil (15 mg/kg, p.o.)and the inhibitor of steroidogenic enzymes finasteride (30 mg/kg, p.o.), which by themselves had no effect on PTSD-associated freezing and anxiety-like behavior.