Comparative Pharmacology
Head-to-head clinical analysis: ACETAMINOPHEN ASPIRIN AND CAFFEINE versus ALEVE PM.
Peer-Reviewed Evidence
Head-to-head clinical analysis: ACETAMINOPHEN ASPIRIN AND CAFFEINE versus ALEVE PM.
ACETAMINOPHEN, ASPIRIN AND CAFFEINE vs ALEVE PM
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Acetaminophen: weak COX-1/2 inhibitor, analgesic and antipyretic through central action; Aspirin: irreversible COX-1/2 inhibitor, anti-inflammatory, analgesic, antipyretic, antiplatelet; Caffeine: adenosine receptor antagonist, CNS stimulant, enhances analgesic effect.
Diphenhydramine is a histamine H1 receptor antagonist that competes with histamine for binding at H1 receptor sites, reducing symptoms of allergic reactions and causing sedation. Naproxen is a nonsteroidal anti-inflammatory drug (NSAID) that inhibits cyclooxygenase (COX) enzymes, decreasing synthesis of prostaglandins, which reduces pain and inflammation.
1-2 tablets (250 mg acetaminophen, 250 mg aspirin, 65 mg caffeine per tablet) orally every 4-6 hours as needed for pain or fever; maximum 8 tablets per 24 hours.
1 tablet (220 mg naproxen sodium / 25 mg diphenhydramine HCl) orally at bedtime as needed. Maximum: 2 tablets in 24 hours.
None Documented
None Documented
Acetaminophen: 2-4 hours (prolonged in liver disease); aspirin: 15-20 minutes (active metabolite salicylate: 2-3 hours at low doses, prolonged to 15-30 hours at high doses); caffeine: 3-6 hours (prolonged in pregnancy, liver disease).
Naproxen: 12-17 hours (mean 13.6 hours); sufficient for twice-daily dosing; prolonged in renal impairment. Diphenhydramine: 2.4-9.3 hours (mean 5.5 hours); longer in elderly, hepatic impairment.
Acetaminophen: renal elimination of metabolites (glucuronide 60%, sulfate 30%, cysteine/mercapturate 8%, unchanged 2%); aspirin: renal elimination of salicylate and metabolites (75% salicyluric acid, 10% glucuronides, 10% salicylate); caffeine: renal elimination of metabolites (paraxanthine, theobromine, theophylline; <3% unchanged). Total: >95% renal.
Naproxen: renal (95% as unchanged drug and metabolites, primarily as naproxen and 6-O-desmethyl naproxen). Diphenhydramine: renal (50-60% as unchanged drug and metabolites, primarily as diphenhydramine and nor diphenhydramine); small amounts in feces.
Category D/X
Category C
NSAID / Antiplatelet
NSAID/Antihistamine Combination