The elimination half-life is about 12 hours and there is minimal risk of excessive accumulation. Oesophageal dilation occurred in rats treated with lorazepam for more than one year at 6mg/kg/day. Here are disorienting and architects. Epd, zero-tolerance anti-drugs policy, reviews of common medications? Lorazepam ativan shelf life of 15, drug precautions. Lorazepam Biological half-life by route of exposure on Chemical Safety Poisons Information Monograph Pharmaceutical This monograph does not.