Comparative Pharmacology
Head-to-head clinical analysis: ALEVE PM versus BUTALBITAL ASPIRIN AND CAFFEINE.
Peer-Reviewed Evidence
Head-to-head clinical analysis: ALEVE PM versus BUTALBITAL ASPIRIN AND CAFFEINE.
ALEVE PM vs BUTALBITAL, ASPIRIN AND CAFFEINE
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
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.
Butalbital is a barbiturate that enhances GABA-A receptor activity, producing sedation and anxiolysis. Aspirin irreversibly inhibits cyclooxygenase-1 and -2, reducing prostaglandin and thromboxane synthesis, leading to analgesic and antipyretic effects. Caffeine is a methylxanthine that antagonizes adenosine receptors, causing vasoconstriction and enhancing analgesia.
1 tablet (220 mg naproxen sodium / 25 mg diphenhydramine HCl) orally at bedtime as needed. Maximum: 2 tablets in 24 hours.
1-2 tablets (each containing butalbital 50 mg, aspirin 325 mg, caffeine 40 mg) orally every 4 hours as needed, not to exceed 6 tablets per day.
None Documented
None Documented
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.
Aspirin (low dose): 2–3 hours; at high doses or in overdose, elimination half-life may prolong to 15–30 hours due to saturation of hepatic conjugation. Butalbital: 35–55 hours (mean ~45 h) with extensive accumulation on repeated dosing. Caffeine: 3–7 hours in healthy adults; prolonged in liver disease or pregnancy.
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.
Aspirin (salicylate) is excreted primarily renally (50–80% as free salicylate and metabolites including salicyluric acid, gentisic acid, and glucuronide conjugates), with dose-dependent kinetics. Butalbital is renally excreted (60–70% as unchanged drug and metabolites, primarily 5-allyl-5-isobutylbarbituric acid). Caffeine is renally excreted (1–3% unchanged, 70–80% as paraxanthine, theobromine, theophylline, and their glucuronides). Biliary/fecal excretion is negligible for all components.
Category C
Category D/X
NSAID/Antihistamine Combination
NSAID / Antiplatelet