Succinic semialdehydase (SSADH) deficiency is an autosomal recessive disorder caused by mutations in the ALDH5A1 gene leading to impaired gamma‐aminobutyric acid (GABA) degradation and, in turn, to accumulation of gamma‐hydroxybutyric acid (GHB) and GABA.88 This evidence concerns the gene ALDH5A1 and hyperinsulinemic hypoglycemia, familial, 4.