Comparative Pharmacology
Head-to-head clinical analysis: DEXTROAMPHETAMINE SULFATE versus METHAMPEX.
Peer-Reviewed Evidence
Head-to-head clinical analysis: DEXTROAMPHETAMINE SULFATE versus METHAMPEX.
DEXTROAMPHETAMINE SULFATE vs METHAMPEX
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Increases extracellular levels of norepinephrine and dopamine by blocking reuptake and promoting release from presynaptic terminals, via trace amine-associated receptor 1 (TAAR1) agonism and vesicular monoamine transporter 2 (VMAT2) inhibition.
Methamphetamine is a sympathomimetic amine that increases synaptic concentrations of dopamine, norepinephrine, and serotonin by promoting their release from presynaptic terminals and inhibiting their reuptake. It also inhibits monoamine oxidase, reducing neurotransmitter catabolism.
5-60 mg/day orally divided every 4-6 hours, starting at 5 mg once or twice daily.
150 mg orally twice daily for 12 weeks; alternative: 90 mg orally twice daily if tolerability issues.
None Documented
None Documented
9-11 hours (adults); clinical context: twice-daily dosing achieves steady-state in ~2-3 days.
Terminal elimination half-life is approximately 9-14 hours in adults with normal renal function (mean ~12 hours). In children, half-life is shorter (~8-10 hours). Context: Steady-state is achieved within 2-3 days. Half-life may be prolonged in patients with renal impairment (up to 20-30 hours) or alkaline urine (up to 30 hours).
Primarily renal (30-50% unchanged at acidic pH, less at alkaline pH); ~50% as metabolites (mostly deaminated and hydroxylated); minimal biliary/fecal.
Primarily renal excretion (≥90% as unchanged drug and metabolites); approximately 70-80% as unchanged amphetamine, 10-15% as deaminated metabolites (hippuric acid, benzoic acid). Biliary/fecal excretion is negligible (<5%). Renal clearance is pH-dependent; acidic urine increases elimination. In overdose or renal impairment, elimination half-life may prolong.
Category D/X
Category C
CNS Stimulant
CNS Stimulant