The FDA has approved the drug copper histidinate (Zycubo) as the first treatment for Menkes disease in pediatric patients. It is a rare childhood disorder. The agency announced the approval on Monday. The treatment is a subcutaneous injection formulation of copper histidine. The goal of the drug is to deliver between the body of patients. This is the first FDA approval of a drug for this disease. The information was published by MedPage Today.