Can i take lorazepam 2.5mg together with amitriptyline 50mg at night ?

Yes/NO: The combination leads to increased sedation. Ativan (lorazepam) is a short acitng benzodiazepine, effect is quick and it leaves the human system relatively quick and that is usually associated with a rebound effect. It is preferable if it is not used regularly even if on prn basis. . Tolerance develops reltively fast and soon both baseline anxiety levels as well as sleep will get worse. See your dr.

Probably but: Need to run it by doc--both are sedative, Elavil (amitriptyline) has some cv effects, there is an increased risk of falls.