ATIVAN (Lorazepam) drug information & product resources from MPR including dosage information, educational materials, & patient assistance. Mar 10, - Learn about Ativan (Lorazepam) may treat, uses, dosage, side effects, drug interactions, warnings, patient labeling, reviews, and related. May 15, - Lorazepam: learn about side effects, dosage, special precautions, and more on MedlinePlus.