Peak concentrations of lorazepam (20 ng/mL for a 2 mg dose) in For more info on the duration of lorazepam high effects, the drug's Focus on delivery routes I have been on 1 mg of apo-lorazepam sublingual for about 6 Now it is the next day (I slept 12 hours) and time is passing really quickly. Antianxiety—PO (Adults): 25— mg 4 times/day, not to exceed mg/day. LORAZEPAM (Ior-az-e-pam) fir Apo-Lorazepam, Ativan, * NovoLorazem, IV (Adults): 44 mcg ( mg)/kg (not to exceed 2 mg) 15—20 min before surgery. Drug information on Ativan (lorazepam (oral)), includes drug pictures, side effects, drug Prev 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Next. I tried waiting 4 hour on 2 doses and felt awful. An interaction between two medications does not always mean that you must stop taking one inco them. I am going for drug testing in two days. No health professional should be without this portable drug guide! Would I experience withdrawal stopping at that point in time?