Amitriptyline-D3.HCl is an internal standard used for the quantification of amitriptyline.HCl. Amitriptyline.HCl, sold under the brand name Elavil, is a tricyclic antidepressant that inhibits the reuptake of norepinephrine and serotonin. It is used to treat depression and neuropathic pain. Amitriptyline-D3.HCl is available as reference material (bulk powder and/or solution) and as calibrated, Ready-to-Use, certified reference material (CRM). This product is designed for qualitative and quantitative protocols and can be used for forensic, toxicology, research, and other chemical/biochemical analytical applications.