Attention-deficit/hyperactivity disorder (ADHD) is a neurodevelopmental disorder, with methylphenidate used as a first-line treatment. Methylphenidate is primarily hydrolyzed by carboxylesterase 1 (CES1) to inactive ritalinic acid, with minor oxidative metabolism producing active p-OH-methylphenidate and 6-oxo-methylphenidate lactam. The functional single-nucleotide polymorphism (SNP) in CES1, resulting in a glycine (G) to glutamic acid (E) substitution at 143 (G143E), is reported to…
