Succinic semialdehyde dehydrogenase deficiency (SSADHD; ALDH5A1; OMIM 271980; HGNC: 408) is a rare, autosomal‐recessive inherited disorder in the GABA pathway (Figure 1; DiBacco et al., 2018). The gene discussed is ALDH5A1; the disease is succinic semialdehyde dehydrogenase deficiency.