Head-to-head clinical analysis & difference comparison: details on mechanism of action, dosing, half-life, interactions, and maternal-fetal safety.
ADVIL PM vs ACETAMINOPHEN, ASPIRIN AND CAFFEINE
Clinician-reviewed, head-to-head comparison of mechanism, dosing, pharmacokinetics, and safety profiles.
Last clinically reviewed: July 2026 · OpiCalc Medical Review Team
Ibuprofen is a nonsteroidal anti-inflammatory drug (NSAID) that inhibits cyclooxygenase (COX) enzymes, reducing prostaglandin synthesis. Diphenhydramine is a first-generation antihistamine that antagonizes histamine H1 receptors, causing sedation.
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.
Temporary relief of occasional sleeplessness associated with minor aches and pains
FDA-approved: Temporary relief of minor aches and pains (headache, muscle ache, toothache, backache, menstrual cramps), reduction of fever.,Off-label: None commonly accepted.
Two caplets (ibuprofen 200 mg, diphenhydramine citrate 38 mg) orally at bedtime as needed for insomnia. Maximum: 2 caplets in 24 hours.
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.
Ibuprofen: 2-4 hours (terminal); clinical context: steady state achieved in 1 day, not affected by renal impairment. Diphenhydramine: 4-8 hours (terminal); clinical context: prolonged in hepatic impairment.
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).
Ibuprofen is primarily metabolized via hepatic oxidation by CYP2C9. Diphenhydramine is metabolized via hepatic N-demethylation and oxidation, primarily by CYP2D6.
Acetaminophen: primarily hepatic via glucuronidation (UGT1A1, UGT1A6, UGT1A9), sulfation (SULT1A1), and minor CYP2E1 (toxic metabolite NAPQI); Aspirin: hydrolyzed to salicylate, further metabolized by conjugation (glycine, glucuronic acid) and oxidation; Caffeine: hepatic via CYP1A2 (major), CYP2E1, CYP3A4, N-acetyltransferase.
Ibuprofen: Renal (90% as metabolites and conjugates, <10% unchanged); Diphenhydramine: Renal (primarily as metabolites, ~1% unchanged). Fecal excretion is negligible for both.
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.
Ibuprofen: >99% bound to albumin; Diphenhydramine: 78-85% bound to albumin.
Acetaminophen: 10-25% (albumin); aspirin: 80-90% (albumin, decreased at high doses); caffeine: 35% (albumin).
Ibuprofen: 0.1-0.2 L/kg; small Vd consistent with high protein binding. Diphenhydramine: 4.5-8.5 L/kg; large Vd indicating extensive tissue distribution.
Acetaminophen: 0.9-1.0 L/kg; aspirin: 0.15-0.2 L/kg (low); caffeine: 0.6-0.8 L/kg. Reflects distribution into total body water.
Ibuprofen: 80-100% (oral); Diphenhydramine: 50-70% (oral) due to first-pass metabolism.
Acetaminophen: oral 85-98%; aspirin: oral 50-80% (due to first-pass hydrolysis); caffeine: oral ~100%.
Avoid use in GFR <30 m L/min. For GFR 30-59 m L/min, limit to single dose and avoid chronic use. No adjustment needed for GFR ≥60 m L/min.
Contraindicated in severe renal impairment (Cr Cl <10 m L/min). For Cr Cl 10-50 m L/min: avoid aspirin component; consider alternative therapy. For Cr Cl >50 m L/min: no adjustment needed for acetaminophen; aspirin may require dose reduction or monitoring.
Contraindicated in Child-Pugh Class C. In Child-Pugh Class B, reduce dose by 50% (max 1 caplet) and monitor for toxicity. No adjustment for Child-Pugh Class A.
Child-Pugh A: caution with acetaminophen (max 2 g/day) and avoid caffeine if severe. Child-Pugh B: avoid aspirin; reduce acetaminophen dose (max 2 g/day) and limit caffeine. Child-Pugh C: contraindicated due to aspirin and acetaminophen risk.
Not recommended for children under 12 years. For age ≥12 years, same adult dose: 2 caplets at bedtime.
Not recommended for children <12 years due to aspirin risk of Reye's syndrome. For adolescents ≥12 years: same as adult dosing: 1-2 tablets every 4-6 hours, max 8 tablets/24 hours.
Start with lowest effective dose (1 caplet) at bedtime to minimize anticholinergic and GI adverse effects. Avoid in elderly with cognitive impairment or high fall risk.
Caution due to increased sensitivity to aspirin (GI bleeding, renal impairment) and caffeine (insomnia, tachycardia). Start at low end of dosing: 1 tablet every 6 hours; monitor renal function and avoid long-term use.
NSAIDs cause an increased risk of serious cardiovascular thrombotic events, including myocardial infarction and stroke, which can be fatal. This risk may occur early in treatment and may increase with duration of use. NSAIDs are contraindicated in the setting of coronary artery bypass graft (CABG) surgery.
Reye syndrome warning: Aspirin should not be used in children or teenagers with viral illnesses due to risk of Reye syndrome.
Cardiovascular thrombotic events,Gastrointestinal bleeding, ulceration, and perforation,Renal toxicity,Sedation and impaired cognitive function,Anticholinergic effects,Avoid use with other NSAIDs or antihistamines,Use caution in elderly, renal impairment, hepatic impairment, and pregnancy
Hepatotoxicity (acetaminophen overdose), gastrointestinal bleeding (aspirin), Reye syndrome (aspirin in children with viral illness), cardiovascular risk (aspirin may increase bleeding), caffeine-related CNS stimulation, risk of dependence.
Hypersensitivity to ibuprofen, diphenhydramine, or any component of the formulation,History of asthma, urticaria, or allergic-type reactions after taking aspirin or other NSAIDs,Perioperative pain in the setting of coronary artery bypass graft (CABG) surgery,Neonates and premature infants (due to diphenhydramine),Concurrent use with other diphenhydramine products or sedatives
Hypersensitivity to any component; active peptic ulcer disease; bleeding disorders; severe hepatic impairment; children/adolescents with viral illness (Reye syndrome); third trimester of pregnancy (aspirin); concurrent use of other salicylates or NSAIDs; severe renal impairment.
Take with food or milk to reduce GI upset. Avoid alcohol and grapefruit juice. Caffeine may enhance CNS stimulation and should be limited.
Alcohol increases risk of hepatotoxicity with acetaminophen and GI bleeding with aspirin. Caffeine-containing foods or beverages should be limited to avoid excessive caffeine intake. High-tyramine foods (e.g., aged cheeses, cured meats) may potentiate caffeine effects; no significant interaction documented.
Pregnancy Category C/D (after 30 weeks). First trimester: Potential risk of miscarriage and cardiac defects (limited data with NSAIDs). Second trimester: Avoid unless clearly needed; possible oligohydramnios, premature closure of ductus arteriosus, and fetal renal impairment. Third trimester: Contraindicated after 30 weeks due to risk of premature ductus arteriosus closure and persistent pulmonary hypertension.
First trimester: Aspirin is associated with increased risk of neural tube defects and cardiac malformations; acetaminophen is considered low risk but some studies suggest possible association with gastroschisis. Second trimester: Aspirin may increase risk of intracranial hemorrhage; acetaminophen and caffeine generally not linked to major malformations. Third trimester: Aspirin use is contraindicated due to risk of premature ductus arteriosus closure and oligohydramnios; high-dose acetaminophen may cause oligohydramnios; caffeine metabolism slows, but moderate intake appears safe; chronic high-dose caffeine may be associated with low birth weight.
Diphenhydramine and ibuprofen are excreted into breast milk. M/P ratio not established. Both drugs are considered compatible with breastfeeding in low doses, but theoretical risk of infant sedation (diphenhydramine) and gastrointestinal effects (ibuprofen). Max daily dose for mother should not exceed recommended limits. Monitor infant for drowsiness and poor feeding.
Acetaminophen: M/P ratio approximately 0.9; small amounts excreted; considered safe. Aspirin: M/P ratio variable, typically 0.12-0.42; avoid high doses due to risk of Reye's syndrome; single doses unlikely harmful. Caffeine: M/P ratio approximately 0.5-1.0; moderate intake (≤300 mg/day) considered safe; excessive intake may cause irritability in infant.
No specific dose adjustment recommended for ibuprofen or diphenhydramine in pregnancy. However, due to altered pharmacokinetics (increased volume of distribution, renal clearance), standard doses may be less effective. Avoid use if possible, especially after 30 weeks. Use lowest effective dose for shortest duration.
Acetaminophen: No dose adjustment needed; standard dosing (650-1000 mg every 4-6 hours, max 3000 mg/day). Aspirin: Avoid doses >81 mg/day in third trimester; use lowest effective dose. Caffeine: Metabolism prolonged; limit to ≤200 mg/day (approximately 2 cups coffee).
Advil PM combines ibuprofen (NSAID) and diphenhydramine (antihistamine). Avoid concomitant use with other NSAIDs or CNS depressants (including alcohol). Use lowest effective dose for shortest duration. Contraindicated in severe hepatic/renal impairment, active GI bleeding, or during third trimester of pregnancy. May cause morning drowsiness due to antihistamine.
Acetaminophen, aspirin, and caffeine combination is used for mild to moderate pain and fever reduction. Aspirin component provides anti-inflammatory effects; caution in patients with bleeding disorders or those on anticoagulants due to increased bleeding risk. Acetaminophen hepatotoxicity risk with doses >4g/day or in liver disease. Caffeine may cause insomnia, tremor, or palpitations; avoid in patients with anxiety disorders. Reye syndrome risk with aspirin use in children with viral illnesses. Monitor renal function in elderly or dehydrated patients.
Take only one tablet before bedtime; do not exceed recommended dose.,Avoid alcohol and other sedatives while using this medication.,Do not use for more than 10 days for pain or 3 days for fever unless directed by a doctor.,May cause drowsiness; avoid driving or operating machinery until you know how the drug affects you.,Not for use in children under 12 years of age or during pregnancy/breastfeeding without consulting a healthcare provider.,Report signs of stomach bleeding (e.g., black/tarry stools, vomiting blood) or allergic reactions (e.g., facial swelling, difficulty breathing).
Do not exceed recommended dose; acetaminophen overdose can cause liver damage.,Avoid alcohol while taking this medication.,Do not use in children or teenagers with viral illnesses due to Reye syndrome risk.,May cause stomach upset; take with food or milk.,Limit caffeine intake from other sources when using this medication.
No interactions on record
"Triamterene, a potassium-sparing diuretic, can inhibit the hepatic metabolism of caffeine by competing for cytochrome P450 (CYP) 1A2, the primary enzyme responsible for caffeine clearance. This leads to increased plasma caffeine concentrations and prolonged caffeine half-life, potentially causing caffeine toxicity manifesting as nervousness, insomnia, tachycardia, and diuresis enhancement. Patients may experience exaggerated stimulant effects and increased risk of cardiac arrhythmias when combining these agents."
"Caffeine inhibits the metabolism of sulfadiazine by competitively antagonizing cytochrome P450 (CYP) enzymes, particularly CYP1A2, leading to increased plasma concentrations of sulfadiazine. This elevates the risk of dose-dependent adverse effects, including crystalluria, nephrotoxicity, and hypersensitivity reactions. The interaction may also reduce the therapeutic efficacy of sulfadiazine due to altered pharmacokinetics."
"Caffeine inhibits the cytochrome P450 enzyme CYP2C9, which is primarily responsible for the metabolism of losartan to its active metabolite E-3174. This inhibition can lead to increased plasma concentrations of losartan and decreased formation of the active metabolite, potentially reducing losartan's antihypertensive efficacy. The clinical outcome may be suboptimal blood pressure control in patients consuming high amounts of caffeine."
Explore head-to-head clinical comparisons of other medications in the same therapeutic classes.
Common clinical questions about ADVIL PM vs ACETAMINOPHEN, ASPIRIN AND CAFFEINE, answered by our medical review team.
ADVIL PM is a NSAID/Sedative Combination that works by Ibuprofen is a nonsteroidal anti-inflammatory drug (NSAID) that inhibits cyclooxygenase (COX) enzymes, reducing prostaglandin synthesis. Diphenhydramine is a first-generation antihistamine that antagonizes histamine H1 receptors, causing sedation.. ACETAMINOPHEN, ASPIRIN AND CAFFEINE is a NSAID / Antiplatelet that works by 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.. They differ in pharmacokinetic profiles, FDA-approved indications, and side effect profiles.
Potency comparisons between ADVIL PM and ACETAMINOPHEN, ASPIRIN AND CAFFEINE depend on the specific clinical indication. These are agents from distinct pharmacological classes and are not directly interchangeable by dose. A physician or clinical pharmacist should guide any therapeutic switching decisions.
The standard adult dose of ADVIL PM is: Two caplets (ibuprofen 200 mg, diphenhydramine citrate 38 mg) orally at bedtime as needed for insomnia. Maximum: 2 caplets in 24 hours.. The standard adult dose of ACETAMINOPHEN, ASPIRIN AND CAFFEINE is: 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.. Dosing should always be individualized based on indication, renal and hepatic function, age, and other patient factors.
No direct drug-drug interaction has been formally documented between ADVIL PM and ACETAMINOPHEN, ASPIRIN AND CAFFEINE in current clinical databases. However, individual patient risk factors including other medications, organ function, and comorbidities should always be evaluated by a qualified healthcare provider.
The maternal-fetal safety profiles differ. ADVIL PM is classified as Category C. Pregnancy Category C/D (after 30 weeks). First trimester: Potential risk of miscarriage and cardiac defects (limited data with NSAIDs). Second trimester: Avoid unless clearly neede. ACETAMINOPHEN, ASPIRIN AND CAFFEINE is classified as Category D/X. First trimester: Aspirin is associated with increased risk of neural tube defects and cardiac malformations; acetaminophen is considered low risk but some studies suggest possible . Always consult a maternal-fetal medicine specialist before taking either drug during pregnancy or lactation.