The following are common ISENTRESS side effects: Dizziness, Fatigue, Headache, Insomnia, Nausea Isentress [package insert]. Whitehouse Station, NJ: Merck; 2007. Dr. Sheehy (BSc Molecular Biology, PharmD) works a clinical pharmacist specializing in cardiology, oncology, and ambulatory care. He’s a board-certified pharmacotherapy specialist (BCPS), and his experience working one-on-one with patients to fine tune their medication and therapy plans for optimal results makes him a valuable subject matter expert for our pharmacy.Read More....