Comparative Pharmacology
Head-to-head clinical analysis: DEXEDRINE SPANSULE versus FOCALIN XR.
Peer-Reviewed Evidence
Head-to-head clinical analysis: DEXEDRINE SPANSULE versus FOCALIN XR.
DEXEDRINE SPANSULE vs FOCALIN XR
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Dextroamphetamine is a central nervous system (CNS) stimulant that increases synaptic concentrations of norepinephrine and dopamine by blocking their reuptake and promoting release from presynaptic terminals.
Focalin XR (dexmethylphenidate) is a central nervous system stimulant. It blocks the reuptake of norepinephrine and dopamine into presynaptic neurons, increasing their concentrations in the synaptic cleft. The d-threo enantiomer is pharmacologically active.
5-60 mg orally once daily in the morning, using extended-release capsules.
Initial 20 mg orally once daily; may increase in 10-20 mg increments at weekly intervals; maximum 60 mg/day.
None Documented
None Documented
Terminal elimination half-life is 6-8 hours in adults, 10-13 hours in children, and prolonged in alkaline urine (up to 16-20 hours) due to enhanced tubular reabsorption. In hepatic impairment, half-life may extend to 12-15 hours. Steady-state is reached within 2-3 days.
Terminal half-life: 2-3 hours for immediate-release; 6-8 hours for extended-release (FOCALIN XR)
Renal excretion of unchanged drug (approximately 30-40% unchanged) and hepatic metabolism to inactive metabolites (primarily hippuric acid, benzoic acid, and hydroxylated derivatives). About 90% of a dose is excreted in urine within 48 hours, with 10-15% as unchanged dextroamphetamine; minor biliary/fecal elimination (<5% total).
Renal (approximately 90% as unchanged drug and metabolites)
Category C
Category C
CNS Stimulant
CNS Stimulant