Comparative Pharmacology
Head-to-head clinical analysis: DEXMETHYLPHENIDATE HYDROCHLORIDE versus METHYLIN ER.
Peer-Reviewed Evidence
Head-to-head clinical analysis: DEXMETHYLPHENIDATE HYDROCHLORIDE versus METHYLIN ER.
DEXMETHYLPHENIDATE HYDROCHLORIDE vs METHYLIN ER
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Dexmethylphenidate is a central nervous system (CNS) stimulant. Its mechanism of action in ADHD is not fully understood, but it is believed to block the reuptake of norepinephrine and dopamine into the presynaptic neuron, increasing their levels in the extraneuronal space.
Methylphenidate is a central nervous system stimulant that blocks the reuptake of dopamine and norepinephrine into presynaptic neurons, increasing their availability in the synaptic cleft.
Initial: 5 mg orally twice daily (morning and noon) with or without food; titrate in increments of 5 mg weekly; maximum 20 mg twice daily (40 mg/day).
20-60 mg orally once daily in the morning
None Documented
None Documented
2-4 hours (immediate-release); 4-5 hours (extended-release); clinical context: short half-life necessitates multiple daily dosing for immediate-release formulations
Mean 3-6 hours in adults; longer in children (4-8 hours). Clinical context: steady-state reached within 2 days; dosing every 8-12 hours.
Renal (78-97% as metabolites and unchanged drug, with approximately 50% as de-esterified metabolites and 30% as unchanged drug)
Renal (90% as metabolites, <1% unchanged). Biliary/fecal: <2%.
Category A/B
Category C
CNS Stimulant
CNS Stimulant