|Trade names||Empaveli, Aspaveli|
|Drug class||Complement inhibitor|
|Chemical and physical data|
|Molar mass||3872.40 g·mol−1|
Paroxysmal nocturnal hemoglobinuria is characterized by red blood cell destruction, anemia (red blood cells unable to carry enough oxygen to tissues), blood clots, and impaired bone marrow function (not making enough blood cells).
Pegcetacoplan is the first treatment for paroxysmal nocturnal hemoglobinuria that binds to and inhibits complement protein C3. Pegcetacoplan was approved for medical use in the United States in May 2021. Pegcetacoplan binds to complement protein C3 and its activation fragment C3b with high affinity, thereby regulating the cleavage of C3 and the generation of downstream effectors of complement activation.
Pegcetacoplan is indicated to treat adults with paroxysmal nocturnal hemoglobinuria (PNH). Pegcetacoplan is only availible for patients who are under the special REMS program.  Two weeks before receiving Pegcetacoplan, patients must receive vaccinations for pneumonia, meningitis, or influenza type B. Patients who have been vaccinated in the past may still need to get vaccinated two weeks before initiation of the medication. 
Patients with PNH have greater and uninhibited complement activity, which may leads to intravascular (inside blood vessels) or extravascular (within the liver or spleen) hemolysis. 
Meningococcal (a type of bacteria) infections can occur in people taking pegcetacoplan and can become life-threatening or fatal if not treated early. Pegcetacoplan may also predispose individuals to serious infections, especially infections caused by encapsulated bacteria. These infections include but are not limited to Streptococcus Pneumoniae, Neisseria meningitidis and Haemophilus Influenzae.Patients should contact their healthcare team right if way if they experience muscle-pain with flu-like symptoms, fever, rash, headache, clammy skin, extreme pain, fast heartbeats, and eye sensitivity to light. Common adverse effects associated with the medication include nausea, diarrhea, cold sores, common-cold like symptoms, tiredness as well as any itching, redness or sensitivity at the injection site. Pegcetacoplan may cause fetal harm so it should be avoided in pregnant patients.  Pegcetacoplan may also interfere with silica reagents in coagulation panels, that can result in patients demonstrating a falsely prolonged activated partial thromboplastin time (aPTT). 
The effectiveness of pegcetacoplan was evaluated in a study enrolling 80 participants with paroxysmal nocturnal hemoglobinuria and anemia who had been taking eculizumab, a treatment previously approved for paroxysmal nocturnal hemoglobinuria.
Society and culture
On 14 October 2021, the Committee for Medicinal Products for Human Use (CHMP) of the European Medicines Agency (EMA) adopted a positive opinion, recommending the granting of a marketing authorization for the medicinal product Aspaveli, intended for the treatment of adults with paroxysmal nocturnal hemoglobinuria. The applicant for this medicinal product is Swedish Orphan Biovitrum AB (publ). Pegcetacoplan was approved for medical use in the European Union in December 2021.
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This article incorporates public domain material from the United States Department of Health and Human Services website http://www.fda.gov/.