About Lorazepam 0.05mg tab

I get perscribed Xanax 1mg Blue tabs for anxiety and im out till tommorrow, someone gave me lorazepam 0.05mg cause i was havin a attack now i was wonderin is it kool to take this to calm me down till tommorrow that is the only medication im takin at the time besides effexor xr 150mg tab for anxiety please let me know thanks alot.