A certified solution standard of Amitriptyline N-β-D-glucuronide, a metabolite of the tricyclic antidepressant amitriptyline. Sold under trade names such as Amitrip®, Elavil®, and Levate®, amitriptyline is prescribed to treat a number of mental disorders ranging from major depressive disorder and anxiety disorder to bipolar disorder. This solution-based Certified Reference Material is applicable for use in LC/MS or GC/MS testing applications in clinical toxicology, forensic analysis, workplace drug testing, and pharmaceutical research.