The experience is much the same as that encountered by the narcotics amphetamines and cocaine. Three to four days after exposure, full recovery is expected from BZ intoxication. The TLV-TWA for BZ is 0.004 mg/m³, and the general population limits are 0.0001 mg/m³. BZ has an ICt50 value of 101 mg-min/m³(15 L/min) and an estimated LCt50 of 200,000 mg-min/m³.