Thank you for your question and welcome to AnxietyConnection.com.
Lorazepam is marketed as a medication called Ativan. Both Ativan and Zanax are benzodiazepines, which are used to treat anxiety.
However, both medications have a different ingredient. Ativan has lorazepam and Zanax has Alprazolam.
Because people react differently to medications, some people may find Ativan to be effective while others may find Zanax works better.
For more information:
Frequently Asked Questions - Benzodiazepines
I hope this information helps.
Having seen extensive experience with both drugs the main differences are their time to onset of action (Of all benzodiazipines Xanax tend to act the fastest to blunt the onset of a panic attack.), (While lorazapan is slower to act but does have a longer action once it begins.
Lorazipan or brand name trademark Ativan is also often used to treat patients with certain siezure disorders and can be taken orally, by shot, IV, tympanic (drops on eardrum) and if still made there use to be a jell form to rub on the anus, though I think most patients tried other administration routes if possible.