Complex sentence: Blood or plasma lorazepam concentrations are usually in a range of 10-300 ug/L in persons either receiving the drug therapeutically or in those arrested for impaired driving, and 300-1000 ug/L in victims of acute overdosage.
Split into simpler sentences: Blood or plasma lorazepam concentrations are usually in a range of 10-300 ug/L in persons either receiving the drug therapeutically or in those arrested for impaired driving. Approximately 300-1000 ug/L is found in victims of acute overdosage.