Pembrolizumab
Pharmaceutical drug used in cancer treatment
Pembrolizumab
Pembrolizumab, sold under the brand name Keytruda, is a humanized monoclonal antibody, more specifically a PD-1 inhibitor, used in cancer immunotherapy to treat many types of cancer. It is administered by slow intravenous injection. Common side effects include fatigue, musculoskeletal pain, decreased appetite, itchy skin, diarrhea, nausea, rash, fever, cough, difficulty breathing, constipation, pain, and abdominal pain. It is an IgG4 isotype antibody that blocks a protective mechanism of cancer cells, allowing the immune system to destroy them. It targets the programmed cell death protein 1 (PD-1) receptor of lymphocytes. Pembrolizumab was approved for medical use in the United States in 2014. It is on the World Health Organization's List of Essential Medicines. A fixed-dose combination of pembrolizumab and berahyaluronidase alfa, (Keytruda Qlex) was approved for medical use in the United States in September 2025.
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