MilliporeSigma, St Louis, the life science business of Merck KGaA, Darmstadt, Germany, has introduced seven certified spiking solutions for antiviral and antiretroviral drugs to its line of certified reference materials (CRMs). ?In the treatment of human immunodeficiency virus, therapeutic drug monitoring (TDM) of antiretroviral agents is often recommended in order to achieve optimal drug concentrations for viral suppression, to monitor adherence, and to minimize drug-associated toxicity. ?The new product line includes solution-based CRMs of acyclovir, efavirenz, ganciclovir, lamivudine, nevirapine, ritonavir, and zidovudine. ?Cerilliant certified reference materials are manufactured for quantitative mass spectrometry-based applications in TDM, diagnostic testing, endocrinology, and pharmaceutical research. For more information, visit MilliporeSigma.