Comparative Pharmacology
Head-to-head clinical analysis: BUTABARB versus BUTALBITAL ACETAMINOPHEN CAFFEINE AND CODEINE PHOSPHATE.
Peer-Reviewed Evidence
Head-to-head clinical analysis: BUTABARB versus BUTALBITAL ACETAMINOPHEN CAFFEINE AND CODEINE PHOSPHATE.
BUTABARB vs BUTALBITAL, ACETAMINOPHEN, CAFFEINE AND CODEINE PHOSPHATE
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Barbiturate that binds to GABA-A receptor subunits, potentiating GABAergic inhibition by increasing chloride ion conductance and reducing neuronal excitability.
Butalbital is a barbiturate that enhances GABA-A receptor activity, producing sedation; acetaminophen inhibits cyclooxygenase (COX) enzymes centrally, reducing pain and fever; caffeine is a nonselective adenosine receptor antagonist, causing vasoconstriction and central nervous system stimulation; codeine is an opioid agonist at mu-opioid receptors, providing analgesia and antitussive effects.
15-30 mg orally 3-4 times daily as needed; maximum 200 mg/day. IV/IM: 50-200 mg for sedation.
1-2 capsules orally every 4 hours as needed for pain, not exceeding 6 capsules per day. Each capsule contains butalbital 50 mg, acetaminophen 300 mg, caffeine 40 mg, and codeine phosphate 30 mg.
None Documented
None Documented
Terminal elimination half-life is 30-60 hours (mean ~40 hours) in adults with normal renal and hepatic function. Longer in elderly or patients with liver disease.
Butalbital: ~35 hours (range 30-50 h), long-acting barbiturate; Acetaminophen: ~2-3 hours; Caffeine: ~3-5 hours in adults; Codeine: ~2.5-3.5 hours; note that codeine's active metabolite morphine has half-life ~2-3 h, and renal impairment prolongs half-life of butalbital and codeine.
Renal excretion of unchanged drug and metabolites. Approximately 70-80% of a dose is eliminated in urine as metabolites (hydroxy and glucuronide conjugates) and <5% as parent drug. Minimal biliary/fecal elimination (<5%).
Butalbital: ~60-70% renal as unchanged drug and metabolites; Acetaminophen: ~90-100% renal within 24 hours (2-5% unchanged, rest as glucuronide and sulfate conjugates); Caffeine: ~1-2% renal unchanged, rest metabolized; Codeine: ~90% renal (10% unchanged, 40% as codeine-6-glucuronide, rest as morphine and norcodeine metabolites). Biliary/fecal excretion minimal for all components.
Category C
Category D/X
Barbiturate
Barbiturate + Analgesic