Comparative Pharmacology
Head-to-head clinical analysis: TESSALON versus TUXARIN ER.
Peer-Reviewed Evidence
Head-to-head clinical analysis: TESSALON versus TUXARIN ER.
TESSALON vs TUXARIN ER
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Benzonatate is a local anesthetic structurally related to tetracaine that inhibits pulmonary stretch receptors and reduces the cough reflex by decreasing the sensitivity of vagal afferent fibers in the respiratory tract.
TUXARIN ER contains dextromethorphan, an NMDA receptor antagonist and sigma-1 receptor agonist, and bupropion, a norepinephrine and dopamine reuptake inhibitor. The combination is thought to modulate glutamatergic neurotransmission and enhance dopaminergic and noradrenergic signaling.
100 mg orally three times daily as needed for cough. Maximum 600 mg/day.
1 tablet orally every 12 hours; each tablet contains chlorpheniramine maleate 8 mg and phenylephrine HCl 20 mg.
None Documented
None Documented
Terminal elimination half-life is approximately 12-15 hours in adults; significant interindividual variability. No accumulation with q6h dosing.
The terminal elimination half-life (t1/2) of chlorpheniramine is approximately 14–25 h in adults, allowing twice-daily dosing. Pseudoephedrine has a shorter t1/2 of 5–8 h in normal renal function, but the ER formulation maintains therapeutic levels for 12 h. In renal impairment, pseudoephedrine half-life prolongs significantly, requiring dose adjustment.
Renal: <5% unchanged; primary route is hepatic metabolism with metabolites excreted renally and fecally; exact biliary/fecal % not established in humans.
TUXARIN ER is a combination antihistamine/decongestant. The antihistamine component (e.g., chlorpheniramine) is extensively metabolized via CYP450; its metabolites and parent drug (∼68% over 48 h) appear in urine as unchanged drug and metabolites. The decongestant (e.g., pseudoephedrine) is primarily excreted unchanged in urine (∼70–90%) with the remainder metabolized in liver; renal elimination is pH-dependent, with acidic urine increasing excretion. Fecal elimination is negligible (<5%).
Category C
Category C
Antitussive
Antitussive/decongestant combination