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C3 Inhibitors: Uses, Common Brands, and Safety Info

C3 inhibitors are drugs that target the protein C3 in the immune system, used for treating complement-mediated diseases and autoimmune conditions. Common brands include Soliris and AMY-101. Safety precautions should be considered, as these medications can increase susceptibility to infections. Consultation with a healthcare professional is advised.

C3 Inhibitors

C3 inhibitors are a class of drugs that target and inhibit the protein C3 in the complement system. The complement system is a part of the immune system responsible for inflammation and defense against foreign invaders such as bacteria and viruses. By inhibiting C3, these drugs help regulate the immune response and can be used to treat various conditions related to an overactive immune system.


C3 inhibitors have shown promise in the treatment of several conditions characterized by excessive inflammation and immune dysregulation. One of the primary uses of C3 inhibitors is in the management of complement-mediated diseases, including paroxysmal nocturnal hemoglobinuria (PNH) and atypical hemolytic uremic syndrome (aHUS). These rare disorders involve abnormal complement activation, leading to destruction of blood cells and potential organ damage. Additionally, C3 inhibitors have been investigated as a potential therapy for autoimmune diseases, such as systemic lupus erythematosus (SLE) and rheumatoid arthritis (RA). These conditions involve an overactive immune response, and inhibiting C3 can help reduce inflammation and prevent damage to tissues and joints.

Common Brands

There are currently a few C3 inhibitors available on the market, and they are typically prescribed under specific brand names. Eculizumab (brand name Soliris) is a well-known C3 inhibitor used for the treatment of PNH and aHUS. It works by binding to C5, a component downstream of C3 in the complement cascade. Another C3 inhibitor currently undergoing clinical trials is AMY-101, which has shown promise in attenuating complement activation.


As with any medication, it is essential to consider the safety profile of C3 inhibitors. These drugs can affect the immune system, making patients more susceptible to infections. Patients receiving C3 inhibitors should be closely monitored and vaccinated against common pathogens to reduce the risk of infections. Additionally, these medications may have potential side effects, such as headaches, fatigue, and infusion reactions. It is crucial to consult with a healthcare professional to determine if C3 inhibitors are appropriate for your condition and to discuss potential risks and benefits. Each patient's situation is unique, and a thorough evaluation should be conducted to ensure the safety and efficacy of these medications. In summary, C3 inhibitors are a class of drugs that target and inhibit the protein C3 in the complement system. They are used in the treatment of complement-mediated diseases, such as PNH and aHUS, as well as certain autoimmune conditions. Common brands include eculizumab (Soliris) and AMY-101. It is important to be aware of the safety considerations associated with C3 inhibitors and to work closely with a healthcare professional when considering their use.

List of C3 Inhibitors