How to take the dosage of Ativan? Take Ativan dosage for anxiety attack treatment. The dosage of Ativan is in two forms:- Ativan ( Lorazepam) injection Ativan Tablets (Lorazepam) tablet. Ativan dosage is decided as per the patient’s age, current medical condition and patient response to the ongoing medical treatment. https://answers.launchpad.net/ubuntu/+question/686573