Complement Component 4, Partial Deficiency of, also known as c1 inhibitor deficiency, is related to c1 inhibitor deficiency and acquired angioedema. An important gene associated with Complement Component 4, Partial Deficiency of is SERPING1 (Serpin Family G Member 1). The drugs Metronidazole and Vancomycin have been mentioned in the context of this disorder. Affiliated tissues include small intestine and endothelial, and related phenotype is systemic lupus erythematosus.