Phenylephrine-AcetaminophenSkip to the navigation
Common brand names:Children's Tylenol Plus, Contac Cold-Flu Max Strength, Excedrin Sinus Headache, DayTime Sinus, Daytime Sinus Relief, Flu & Severe Cold-Daytime, Mapap Sinus Max Strength (PE), Mapap Sinus PE, Non-Aspirin Sinus, Non-Pseudo Sinus Pain-Pressure, Pain Relief Sinus PE, Pyrroxate Cold & Congest, Sinus Congestion & Pain, Sinus Formula DayTime, Sinus Headache PE, Sinus Maximum Strength, Sinus Pain Relief, Sinus PE, Sinutab Sinus Maximum Strength, Sudafed PE Sinus Headache, Suphedrine PE Sinus Headache, Tylenol Infants Plus Cold, Tylenol Sinus Congestion Pain
Summary of Interactions with Vitamins, Herbs, & Foods
Replenish Depleted Nutrients
Reduce Side Effects
Silymarin is a collection of complex flavonoids found in milk thistle (Silybum marianum) that has been shown to elevate liver glutathione levels in rats.1 Acetaminophen can cause liver damage, which is believed to involve glutathione depletion.2 In one study involving rats, silymarin protected against acetaminophen-induced glutathione depletion.3 While studies to confirm this action in humans have not been conducted, some doctors recommend silymarin supplementation with 200 mg milk thistle extract, containing 70–80% silymarin, three times per day for people taking acetaminophen in large amounts for more than one year and/or with other risk factors for liver problems.The interaction is supported by preliminary, weak, fragmentary, and/or contradictory scientific evidence.
Food, especially foods high in pectin (including jellies), carbohydrates, and many types of cruciferous vegetables (broccoli, Brussels sprouts, cabbage, and others) can interfere with acetaminophen absorption.4 It is unclear how much effect this interaction has on acetaminophen activity.
One small study found that hibiscus could decrease levels of acetaminophen if the drug was taken after the tea was consumed though it was not entirely clear if the decreases were clinically significant.5
Food, especially foods high in pectin (including jellies), carbohydrates, and many types of cruciferous vegetables (broccoli, Brussels sprouts, cabbage, and others) can interfere with acetaminophen absorption.6 It is unclear how much effect this interaction has on acetaminophen activity.The interaction is supported by preliminary, weak, fragmentary, and/or contradictory scientific evidence.
Potential Negative Interaction
Hospitals use oral and intravenous NAC to treat liver damage induced by acetaminophen overdose poisoning.8 NAC is often administered intravenously by emergency room doctors. Oral NAC appears to be effective for acetaminophen toxicity.
An uncontrolled trial compared intravenous NAC with oral NAC in children with acetaminophen poisoning and found that both methods were equally effective in reversing acetaminophen-induced liver toxicity.9 However, acetaminophen toxicity is a potential medical emergency, and should only be managed by qualified healthcare professionals.
Gomisin A is a constituent found in the Chinese herb schisandra (Schisandra chinensis). In a study of rats given liver-damaging amounts of acetaminophen, gomisin A appeared to protect against some liver damage but did not prevent glutathione depletion10 (unlike milk thistle, as reported above). Studies have not yet confirmed this action in humans.
Taking 3 grams vitamin C with acetaminophen has been shown to prolong the amount of time acetaminophen stays in the body.11 This theoretically might allow people to use less acetaminophen, thereby reducing the risk of side effects. Consult with a doctor about this potential before reducing the amount of acetaminophen. However, increasing the time acetaminophen is in the body might also theoretically increase its toxicity. Consult with a doctor before taking vitamin C along with acetaminophen.12The interaction is supported by preliminary, weak, fragmentary, and/or contradictory scientific evidence.
1. Valenzuela A, Aspillaga M, Vial S, Guerra R. Selectivity of silymarin on the increase of the glutathione content in different tissues of the rat. Planta Med 1989;55:420-2.
2. Threlkeld DS, ed. Central Nervous System Drugs, Acetaminophen. In Facts and Comparisons Drug Information. St. Louis, MO: Facts and Comparisons, Mar 1997, 247-f.
3. Campos R, Garrido A, Guerra R, Valenzuela A. Silybin dihemisuccinate protects against glutathione depletion and lipid peroxidation induced by acetaminophen on rat liver. Planta Med 1989;55:417-9.
4. Holt GA. Food & Drug Interactions. Chicago: Precept Press, 1998, 2.
5. Kolawole JA, Maduenyi A. Effect of zobo drink (Hibiscus sabdariffa water extract) on the pharmacokinetics of acetaminophen in human volunteers. Eur J Drug Metab Pharmacokinet 2004;29:25-9.
6. Holt GA. Food & Drug Interactions. Chicago: Precept Press, 1998, 2.
7. Holt GA. Food & Drug Interactions. Chicago: Precept Press, 1998, 2.
8. Vale JA, Proudfoot AT. Paracetamol (acetaminophen) poisoning. Lancet 1995;346:547-52.
9. Perry HE, Shannon MW. J Pediatr 1998;132:149-52.
10. Yamada S, Murawaki Y, Kawasaki H. Preventive effect of gomisin A, a lignan component of schizandra fruits, on acetaminophen-induced hepatotoxicity in rats. Biochem Pharmacol 1993;46:1081-5.
11. Houston JB, Levy G. Drug biotransformation interactions in man. VI: Acetaminophen and ascorbic acid. J Pharm Sci 1976;65:1218-21.
12. FDA Information on Acetaminophen, Jan 13, 2011. http://www.fda.gov/Drugs/DrugSafety/InformationbyDrugClass/ucm165107.htm
Last Review: 04-29-2014
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The information presented in Aisle7 is for informational purposes only. It is based on scientific studies (human, animal, or in vitro), clinical experience, or traditional usage as cited in each article. The results reported may not necessarily occur in all individuals. For many of the conditions discussed, treatment with prescription or over-the-counter medication is also available. Consult your doctor, practitioner, and/or pharmacist for any health problem and before using any supplements or before making any changes in prescribed medications. Information expires June 2015.