<prompt> Drug of choice for treating Attention Deficit Hyperactivity Disorder ADHD in a 6-year-old boy whose father has a history of substance abuse:MethylphenidateAtomoxetineClonidineDexamphetamine  <response>: Ans: b AtomoxetineRef: Stahls Essential Psychopharmacology, 4th editionTreatment for ADHDA. Pharmacotherapy: Note: Drugs reserved till 6 years of ageThree types of drugs used currently:Stimulants Amphetamines, MethylphenidateThey are first-line drugsThey act by several mechanisms which ultimately end up in enhancing monoamine actionsMost importantly catecholamine epinephrine, norepinephrine and dopamine are enhancedComplications: Seizures, Psychosis, DependenceHence contraindicated if a person is havinghadfamily history of these conditions AtomoxetineIt is a Norepinephrine reuptake inhibitor NRIIt has no side effect profile like amphetamines.Hence, useful when in conditions where stimulants are contraindicated.Contraindicated in hypertension, arrhythmias, pheochromocytomaIt is useful in adults also.ClonidineIt improves attention by increasing noradrenergic tone in locus coeruleus and prefrontal cortex binding to postsynaptic a2A adrenergic receptorsIt controls hyperactivity by suppressing sympathetic outflow.B. Psychotherapya. Behavior therapy Positive reinforcementb. Neurofeedback 