Good Evening, I'm curious to know how Amitriptyline HCI 25mg (Elavil), commonly prescribed as an anti-depressant, can be an effective RX, for muscle sprains\spasms in your back. The Rx is for 30 days, and the injury is severe right now, but should heal within a week or so. I'm more so curious if this is the type of anti-depressant they warn you that you cannot just stop taking when the Rx is empty........