IBUPROFEN AND PHENYLEPHRINE HYDROCHLORIDE
Clinical safety rating: avoid
ACE inhibitors and ARBs may have diminished antihypertensive effect Increases risk of serious cardiovascular thrombotic events and GI bleeding.
Ibuprofen is a nonsteroidal anti-inflammatory drug (NSAID) that inhibits cyclooxygenase (COX-1 and COX-2) enzymes, reducing prostaglandin synthesis. Phenylephrine is a selective alpha-1 adrenergic receptor agonist, causing vasoconstriction.
| Metabolism | Ibuprofen is primarily metabolized by CYP2C9 and CYP2C8. Phenylephrine undergoes oxidative deamination via monoamine oxidase (MAO) and conjugation with sulfate or glucuronide. |
| Excretion | Ibuprofen: Renal elimination of metabolites (90%) and unchanged drug (1-10%); biliary/fecal excretion minor. Phenylephrine: Renal elimination (80-85% as inactive metabolites, 2-3% unchanged); biliary/fecal negligible. |
| Half-life | Ibuprofen: 2-4 hours (prolonged in overdose or hepatic impairment). Phenylephrine: 2-3 hours (clinical activity may persist longer due to vasoconstrictive effects). |
| Protein binding | Ibuprofen: 99% bound to albumin. Phenylephrine: 95% bound to albumin and alpha-1-acid glycoprotein. |
| Volume of Distribution | Ibuprofen: 0.1-0.2 L/kg (low, reflecting high protein binding). Phenylephrine: 0.2-0.5 L/kg (moderate, distributes to tissues). |
| Bioavailability | Ibuprofen: Oral 80-100% (immediate-release); food delays absorption. Phenylephrine: Oral 38-50% (first-pass metabolism by MAO; OTC formulation 100% relative to reference). |
| Onset of Action | Ibuprofen: Oral 30-60 min. Phenylephrine: Oral 15-30 min. |
| Duration of Action | Ibuprofen: 4-6 hours (pain/fever). Phenylephrine: 4-6 hours (decongestion); tolerance may develop with prolonged use. |
1 tablet (ibuprofen 200 mg/phenylephrine HCl 10 mg) orally every 4-6 hours as needed, not to exceed 6 tablets per 24 hours.
| Dosage form | TABLET |
| Renal impairment | GFR 30-89 mL/min: No adjustment. GFR 15-29 mL/min: Avoid use or reduce dose/frequency; contraindicated if GFR <30 mL/min for ibuprofen component. GFR <15 mL/min: Contraindicated. |
| Liver impairment | Child-Pugh A: No adjustment. Child-Pugh B: Caution; reduce dose or extend interval (specific guidance not established). Child-Pugh C: Avoid use due to increased risk of hepatotoxicity and fluid retention. |
| Pediatric use | Not recommended in children under 12 years of age. For children ≥12 years: Same as adult dosing (1 tablet every 4-6 hours, max 6 tablets/day) based on ibuprofen 200 mg/phenylephrine 10 mg. |
| Geriatric use | Start at lowest effective dose (e.g., 1 tablet every 6-8 hours). Monitor renal function and cardiovascular status; avoid in those with uncontrolled hypertension, CAD, or heart failure. Maximum daily dose not to exceed 3 tablets due to increased sensitivity to phenylephrine and ibuprofen side effects. |
| 1st trimester | Consult provider |
| 2nd trimester | Consult provider |
| 3rd trimester | Consult provider |
Clinical note
ACE inhibitors and ARBs may have diminished antihypertensive effect Increases risk of serious cardiovascular thrombotic events and GI bleeding.
| FDA category | Positive |
| Breastfeeding | Ibuprofen is excreted in breast milk in low amounts (M/P ratio ~0.01). Phenylephrine is poorly excreted. Compatible with breastfeeding when used short-term at recommended doses. |
| Teratogenic Risk | First trimester: NSAIDs associated with increased risk of miscarriage and cardiac defects. Second trimester: Avoid due to risk of oligohydramnios and fetal renal dysfunction. Third trimester: Contraindicated due to risk of premature closure of ductus arteriosus and persistent pulmonary hypertension. |
■ FDA Black Box Warning
NSAIDs may cause an increased risk of serious cardiovascular thrombotic events, myocardial infarction, and stroke, which can be fatal. Risk may increase with duration of use. NSAIDs are contraindicated in patients with recent coronary artery bypass graft (CABG) surgery.
| Common Effects | fever |
| Serious Effects |
Hypersensitivity to any component, history of asthma, urticaria, or allergic-type reactions after taking aspirin or other NSAIDs, in patients with severe hypertension or coronary artery disease, during or immediately before/after CABG surgery, patients taking MAO inhibitors, and in patients with urinary retention or narrow-angle glaucoma.
| Precautions | Cardiovascular risk: NSAIDs increase risk of serious cardiovascular events. Gastrointestinal risk: NSAIDs cause increased risk of serious GI adverse events including bleeding, ulceration, and perforation. Avoid in patients with severe hypertension or cardiovascular disease. Use with caution in patients with hyperthyroidism, diabetes, or prostatic hypertrophy due to phenylephrine. |
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| Fetal Monitoring | Monitor amniotic fluid index, fetal renal function, and ductus arteriosus patency via ultrasound if used in second/third trimester. Also monitor maternal blood pressure due to phenylephrine. |
| Fertility Effects | NSAIDs like ibuprofen may impair female fertility by inhibiting prostaglandin synthesis, interfering with ovulation and implantation. Reversible upon discontinuation. |