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A monoclonal antibody is a lab-made immune protein designed to attach to a specific target in the body. The target can be a protein on a cancer cell, immune cell, virus, or inflammatory pathway. Monoclonal antibodies can help the immune system find harmful cells, block disease signals, or carry treatment to a target. They are biologic medicines and are commonly given by injection or infusion.
read more about monoclonal antibody ...Natural antibodies help the immune system recognize specific substances called antigens. Monoclonal antibodies are designed to bind to one specific antigen. After binding, they can block a receptor, mark a cell for immune attack, neutralize a toxin or virus, or interfere with inflammation. Some monoclonal antibodies are also linked to chemotherapy, radiation, or another treatment payload.
Monoclonal antibodies are used for cancers, autoimmune diseases, inflammatory diseases, viral infections, asthma, migraine prevention, osteoporosis, and some eye diseases. Their use depends on the target involved in the disease. Some are used alone, while others are used with chemotherapy, immunotherapy, steroids, or other medicines. A clinician chooses treatment based on diagnosis, lab testing, disease severity, and medical history.
Monoclonal antibodies can target tumor markers, immune checkpoints, inflammatory proteins, cell surface receptors, or infectious agents. Examples include adalimumab, infliximab, rituximab, trastuzumab, pembrolizumab, omalizumab, ranibizumab, and bevacizumab. Some names end in -mab, which can help identify them as monoclonal antibody medicines. Biosimilar versions are available for some monoclonal antibodies.
Side effects can include injection-site reactions, infusion reactions, fever, chills, rash, headache, nausea, fatigue, or increased infection risk. Some monoclonal antibodies can cause serious allergic reactions, immune-related inflammation, low blood counts, cytokine release syndrome, or organ-specific side effects. Monitoring depends on the medicine and condition being treated. Seek urgent care for trouble breathing, swelling of the face or throat, severe rash, chest pain, confusion, or signs of serious infection.
Yes, monoclonal antibodies are biologic medicines. They are made using living systems or biologic processes rather than simple chemical synthesis.
No, monoclonal antibodies and vaccines work differently. Vaccines train the immune system to make its own response, while monoclonal antibodies give a targeted antibody directly.
The -mab ending is commonly used in monoclonal antibody medicine names. It can help identify the medicine class, though naming rules have changed over time.
Yes, allergic or infusion reactions can happen. Trouble breathing, swelling, severe rash, dizziness, or chest symptoms need urgent medical care.
Monoclonal Antibodies. National Cancer Institute. https://www.cancer.gov/about-cancer/treatment/types/immunotherapy/monoclonal-antibodies. Date Accessed June 3, 2026.
Definition of Monoclonal Antibody. National Cancer Institute Dictionary of Cancer Terms. https://www.cancer.gov/publications/dictionaries/cancer-terms/def/monoclonal-antibody. Date Accessed June 3, 2026.
Monoclonal Antibodies: Purpose, Risks & Results. Cleveland Clinic. https://my.clevelandclinic.org/health/treatments/22246-monoclonal-antibodies. Date Accessed June 3, 2026.
Monoclonal Antibodies in Clinical Practice. StatPearls (NCBI Bookshelf). https://www.ncbi.nlm.nih.gov/books/NBK572118/. Date Accessed June 3, 2026.
Monoclonal antibody medicines for cancer: How they work. Mayo Clinic. https://www.mayoclinic.org/tests-procedures/cancer-treatment/in-depth/monoclonal-antibody/art-20047808. Date Accessed June 3, 2026.