Ativan (lorazepam). The fastest-acting of the bunch, and for even faster response you can put a tablet under your tongue. Ativan has practically no additional reported side effects, other than the usual temporary stuff you get from any medication (e.g. headaches, dizziness, tummy troubles). Just some liver and kidney problems, agitation and skin problems. That’s it. Nothing freaky. Sorry. Plus of all the benzos it’s the least likely to be abused and the easiest to discontinue. Dosage: For anxiety 2-3 mg a day, divided over two or three doses. For insomnia 2-4 mg taken at bedtime. The usual maintenance dosage is 2-6 mg a day, although it can vary from 1-10 mg a day, taken between two and four times a day. Ativan has a half-life of 16 hours. Wyeth-Ayerst.