Comparative Pharmacology
Head-to-head clinical analysis: PHENERGAN W CODEINE versus QDOLO.
Peer-Reviewed Evidence
Head-to-head clinical analysis: PHENERGAN W CODEINE versus QDOLO.
PHENERGAN W/ CODEINE vs QDOLO
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Promethazine is a phenothiazine derivative with H1 receptor antagonist activity, antiemetic, and sedative properties. Codeine is an opioid agonist that binds to mu-opioid receptors in the CNS, inhibiting pain transmission and causing cough suppression.
Tramadol is a centrally acting synthetic opioid analgesic. It binds to μ-opioid receptors and inhibits norepinephrine and serotonin reuptake.
10 mL (containing promethazine 6.25 mg and codeine 10 mg) orally every 4 to 6 hours, not to exceed 60 mL (codeine 60 mg) per day.
Oral: 50-100 mg every 4-6 hours as needed for pain; maximum 400 mg per day. Immediate-release tablets only. Extended-release formulations require different dosing and are not interchangeable.
None Documented
None Documented
Promethazine: 9-16 h; codeine: 3.5 h (terminal), prolonged in renal impairment (up to 18 h).
Terminal elimination half-life approximately 2-4 hours in adults; prolonged to 4-6 hours in elderly and up to 12-16 hours in severe renal impairment (CrCl <30 mL/min)
Renal: 70% (codeine as unchanged and metabolites, ~10% as morphine-3-glucuronide, <10% as morphine); biliary/fecal: 30% (promethazine as sulfoxides and glucuronides).
Renal 90% (60% unchanged, 30% as glucuronide conjugate), fecal 10%
Category D/X
Category C
Opioid Agonist
Opioid Agonist