Methylmalonic Acidemia with Homocystinuria, also known as combined defect in adenosylcobalamin and methylcobalamin synthesis, is related to methylmalonic aciduria and homocystinuria, cblc type and methylmalonic aciduria and homocystinuria, cblf type. The drugs Hydroxocobalamin and Cyanocobalamin have been mentioned in the context of this disorder. Affiliated tissues include spinal cord and eye, and related phenotypes are intellectual disability and seizure