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Merck makes pharmaceutical products to treat several conditions in a number of therapeutic areas, including cardiometabolic disease, cancer, and infections. In cancer, the firm's immuno-oncology platform, led by Keytruda, is a major contributor to overall sales. The company also has a substantial vaccine business aimed at preventing pediatric diseases, as well as Gardasil for human papillomavirus. Additionally, Merck sells animal health-related drugs. From a geographical perspective, 53% of the company's 2025 sales were generated from US human health (pharmaceuticals and vaccines).

AbbVie is a pharmaceutical firm with a strong exposure to immunology (with Humira, Skyrizi, and Rinvoq) and oncology (with Imbruvica and Venclexta). The company was spun off from Abbott in early 2013. The 2020 acquisition of Allergan added several new products and drugs in aesthetics, including Botox. The 2024 acquisitions of Cerevel (neuroscience) and ImmunoGen (oncology) help supplement AbbVie's portfolio.