Drug & supplement interaction

Brussels Sprout + Acetaminophen, Chlorpheniramine, Phenylephrine, Salicylamide

Acetaminophen, Chlorpheniramine, Phenylephrine, Salicylamide brand names: Rhinogesic JR, Rhinogesic.

Moderate Interaction
Medically reviewed by · Updated September 2026
The bottom line Moderate

Acetaminophen, Chlorpheniramine, Phenylephrine, Salicylamide falls into 3 drug categories that Brussels Sprout can interact with; the most serious is rated moderate. Animal research suggests that Brussels sprout can induce cytochrome P450 1A2 (CYP1A2) activity.

Read the full interaction report
SeverityModerate
LikelihoodPossible
Interactions3
EvidenceD
What do Severity, Likelihood & Evidence mean?
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Interaction report

Brussels Sprout and Acetaminophen, Chlorpheniramine, Phenylephrine, Salicylamide

These two interact in 3 distinct ways. Each one is explained separately below.

Why Are There 3 Interactions?

Brussels Sprout interacts with whole categories of medication. Acetaminophen, Chlorpheniramine, Phenylephrine, Salicylamide falls into 3 of those categories, so it can interact with Brussels Sprout in 3 different ways. We’ve listed each one below — your overall risk is driven by the most serious of them (Moderate).

Moderate

CYTOCHROME P450 1A2 (CYP1A2) SUBSTRATES

1 of 3

Why this applies to Acetaminophen, Chlorpheniramine, Phenylephrine, Salicylamide

Acetaminophen, Chlorpheniramine, Phenylephrine, Salicylamide falls under CYTOCHROME P450 1A2 (CYP1A2) SUBSTRATES — the group Brussels Sprout interacts with.

Animal research suggests that Brussels sprout can induce cytochrome P450 1A2 (CYP1A2) activity. Theoretically, Brussels sprout might increase the clearance and decrease the effects of drugs metabolized by CYP1A2. Some drugs metabolized by CYP1A2 include clozapine (Clozaril), cyclobenzaprine (Flexeril), fluvoxamine (Luvox), haloperidol (Haldol), imipramine (Tofranil), mexiletine (Mexitil), olanzapine (Zyprexa), pentazocine (Talwin), propranolol (Inderal), tacrine (Cognex), theophylline, zileuton (Zyflo), zolmitriptan (Zomig), and others.
Severity Moderate Likelihood Possible Evidence D

Interaction has been documented in animal or in lab research, or the interaction has been documented in humans but is limited to case reports or conflicting clinical research exists.

Dr. Brian Staiger, PharmD, BCPS
Dr. Brian Staiger explains PharmD, Clinical Pharmacist

Here's the honest scoop on eating Brussels sprouts while taking this cold and allergy combo (Rhinogesic). The concern on file is that compounds in Brussels sprouts may gently speed up a liver enzyme called CYP1A2. In theory, that could help your body clear certain medicines a little faster, making them slightly less effective. For this product, that mostly touches the acetaminophen and antihistamine (chlorpheniramine) portions, so you might notice a touch less fever or pain relief, or less drowsiness control.

The good news: this is based only on lab and animal studies, and normal food amounts of Brussels sprouts are very unlikely to cause a real problem. Enjoy them as part of a healthy diet. If you ever feel your medicine isn't working, just check with your pharmacist or doctor.

Contact Dr. Brian directly if you have additional questions on this interaction
References
  1. Wortelboer HM, de Kruif CA, van Iersel AAJ, et al. Effects of cooked Brussels sprouts on cytochrome P-450 profile and phase II enzymes in liver and small intestinal mucosa of the rat. Food Chem Toxicol 1992;30(1):17-27. PubMed
Moderate

GLUCURONIDATED DRUGS

2 of 3

Acetaminophen, Chlorpheniramine, Phenylephrine, Salicylamide also falls under GLUCURONIDATED DRUGS.

A cabbage and Brussels sprout-containing diet seems to boost elimination through glucuronide conjugation. Theoretically, these foods might also lower levels of other drugs that are metabolized through glucuronide conjugation, including acetaminophen (Tylenol, others) and oxazepam (Serax), haloperidol (Haldol), lamotrigine (Lamictal), morphine (MS Contin, Roxanol), zidovudine (AZT, Retrovir), and others.
Severity Moderate Likelihood Probable Evidence B

Interaction has not been documented in well-controlled studies, however, the interaction has been demonstrated in some small human studies or in controlled animal studies in conjunction with multiple case reports..

Dr. Brian Staiger, PharmD, BCPS
Dr. Brian Staiger explains PharmD, Clinical Pharmacist

This combination cold-and-pain product includes acetaminophen, which your body clears partly through a process called glucuronidation. Brussels sprouts (and other cruciferous veggies like cabbage) may gently speed that pathway up. In theory, that could nudge acetaminophen levels a little lower, which mostly just means you might get slightly less pain or fever relief, not more side effects. This isn't a prodrug situation, so we're talking about a mild reduction in effect at most.

Honestly, eating Brussels sprouts as food is unlikely to cause a real problem here, and the evidence behind this is fairly limited. I'd enjoy your veggies and not worry. If you take acetaminophen often or have liver concerns, just check with your pharmacist or doctor about your usual dose.

Contact Dr. Brian directly if you have additional questions on this interaction
References
  1. Pantuck EJ, Pantuck CB, Anderson KE, et al. Effect of brussels sprouts and cabbage on drug conjugation. Clin Pharmacol Ther 1984;35:161-9. PubMed
Moderate

ACETAMINOPHEN (Tylenol, others)

3 of 3
A cabbage and Brussels sprout-containing diet can increase metabolism and decrease levels of acetaminophen. In clinical research, a diet that includes daily consumption of cabbage and Brussels sprout decreases acetaminophen levels by as much as 16%. This appears to occur due to a boost of elimination through glucuronide conjugation.
Severity Moderate Likelihood Probable Evidence B

Interaction has not been documented in well-controlled studies, however, the interaction has been demonstrated in some small human studies or in controlled animal studies in conjunction with multiple case reports..

Dr. Brian Staiger, PharmD, BCPS
Dr. Brian Staiger explains PharmD, Clinical Pharmacist

This combo cold product (Rhinogesic) contains acetaminophen for pain and fever, along with an antihistamine, a decongestant, and salicylamide. The piece that interacts here is the acetaminophen. Eating a lot of Brussels sprouts (and cabbage) regularly can speed up how your body clears acetaminophen, mainly by boosting a process called glucuronidation. In clinical research this lowered acetaminophen levels by up to about 16%.

What that means in plain terms: your fever or aches might not be controlled quite as well. This is a fairly small change, and normal food amounts are unlikely to cause real trouble. It does not make the medicine more dangerous. If you eat these veggies daily and feel the medicine isn't working as expected, chat with your pharmacist or doctor before adjusting anything.

Contact Dr. Brian directly if you have additional questions on this interaction
References
  1. Pantuck EJ, Pantuck CB, Anderson KE, et al. Effect of brussels sprouts and cabbage on drug conjugation. Clin Pharmacol Ther 1984;35:161-9. PubMed

What These Ratings Mean

Every interaction above is graded three ways — here’s the key to each label.

Severity how clinically significant the interaction is
Major

Clinically significant. Avoid the combination, or use only under close professional supervision.

Moderate

Usually worth avoiding or managing — may need monitoring, a dose change, or timing apart.

Minor

Generally not serious. Be aware of it and mention it to your pharmacist.

Likelihood how strong the evidence is that the interaction actually happens in people
  • LikelyWell-controlled human studies have demonstrated the likely existence of this interaction.
  • ProbableInteraction has not been documented in well-controlled studies, however, the interaction has been demonstrated in some small human studies or in controlled animal studies in conjunction with multiple case reports.
  • PossibleInteraction has been documented in animal or in lab research, or the interaction has been documented in humans but is limited to case reports or conflicting clinical research exists.
  • UnlikelyInteraction has been demonstrated in animal or in lab research but has been shown not to occur in humans.
Evidence the quality of the studies behind the rating (graded A–D)
  • AHigh-quality meta-analysis (quantitative systematic review).
  • BCase-control study.
  • CConsensus.
  • DAnecdotal evidence.

These ratings are for information only. Never start, stop, or otherwise change your therapy before speaking with your provider.

Keep it in perspective

Brussels Sprout Also Interacts With Other Medications

Brussels Sprout has 240 moderate known drug interactions in our database — the Acetaminophen, Chlorpheniramine, Phenylephrine, Salicylamide one above is among them. If you take anything else, check it against the full list below.

Moderate 240 No known interaction 2,590 (incl. Acetaminophen, Chlorpheniramine, Phenylephrine, Salicylamide)
Taking anything else?

Check Another of Your Medications Against Brussels Sprout

Covers the 2,830 medications we’ve checked against Brussels Sprout. Pick one to open its full report.

Everything else you take

See Every Supplement That Interacts With Acetaminophen, Chlorpheniramine, Phenylephrine, Salicylamide

This page covers Brussels Sprout only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Acetaminophen, Chlorpheniramine, Phenylephrine, Salicylamide page lists 292 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Asarabacca (major), Beer (major), Ephedra (major) and Grapefruit (major).

By severity: 14 major · 232 moderate · 46 minor.

From our pharmacist’s overview on the Acetaminophen, Chlorpheniramine, Phenylephrine, Salicylamide page

“I would slow down before pairing supplements with Rhinogesic (acetaminophen, chlorpheniramine, phenylephrine, salicylamide). Each part of this cold remedy opens a different door to trouble, so supplements can collide with it from several directions at once.”

Reviewed by 2 · Jul 18, 2026

Open the Acetaminophen, Chlorpheniramine, Phenylephrine, Salicylamide interaction page

How much people look this up

Where Brussels Sprout and Acetaminophen, Chlorpheniramine, Phenylephrine, Salicylamide Sit Against Everything Else

Out of every supplement and medication people look up on HelloPharmacist, here is where these two land this week — and which way each has been moving.

Supplement Brussels Sprout
Top half

#545 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Acetaminophen, Chlorpheniramine, Phenylephrine, Salicylamide
Top 5%

#36 of 2,830 medications looked up here in the last 7 days

29 days ago today

Position among everything looked up on this site, not a measure of how commonly either one is used or how important it is. A supplement can climb this list because of a news story. It counts every request to the page, automated ones included, and nothing here identifies anyone.

Supplement

About Brussels Sprout

What is Brussels Sprout?

  • General nutrition and fiber
  • Antioxidant support
  • Digestive health
  • Heart health support
  • Cancer-prevention interest

Brussels sprouts are a nutritious cruciferous vegetable rich in fiber, vitamin C, vitamin K, and plant compounds called glucosinolates. Eating them as part of a balanced diet is healthy and safe for most people, but supplement-style claims (like preventing cancer) are not well proven. If you take blood thinners or have thyroid concerns, talk with your pharmacist or doctor about your intake.

Read the full Brussels Sprout monograph & all interactions
Keep checking

Other Drugs & Brussels Sprout

Browse every other medication we’ve checked against Brussels Sprout — both the ones with a known interaction and the ones without. Select any drug for the full detail.

0Major
240Moderate
0Minor
2,589No known interaction
240 Moderate 2,589 No interaction
Moderate

240 interactions

Showing 60 of 240 moderate interactions — see all 240 on the Brussels Sprout page.

No interaction 2,589 drugs checked — show the list

We also checked Brussels Sprout against these medications and found no known interaction in our sources. Open any page to confirm.

Showing the 60 most looked-up of 2,589 medications checked with no known interaction — see the full Brussels Sprout list.

See the full Brussels Sprout interactions page
See every supplement checked against Acetaminophen, Chlorpheniramine, Phenylephrine, Salicylamide, ranked by severity
Sources

Sources & How We Checked

Interaction details are evidence-graded and sourced from the Natural Medicines database. The medication overview comes from MedlinePlus.

Content is written and reviewed by licensed HelloPharmacist pharmacists. See our data sources and editorial standards for how this information is built and checked.

Parts of this content are provided by the Therapeutic Research Center, LLC.

DISCLAIMER: Currently this does not check for drug-drug interactions. This is not an all-inclusive comprehensive list of potential interactions and is for informational purposes only. Not all interactions are known or well-reported in the scientific literature, and new interactions are continually being reported. Input is needed from a qualified healthcare provider including a pharmacist before starting any therapy. Application of clinical judgment is necessary.

© 2021 Therapeutic Research Center, LLC

Keep exploring
Brussels Sprout monograph › Uses, safety, and every drug interaction in one place Acetaminophen, Chlorpheniramine, Phenylephrine, Salicylamide supplement interactions › Every supplement checked against Acetaminophen, Chlorpheniramine, Phenylephrine, Salicylamide, ranked by severity Supplement interaction checker › Check any supplement or product against your medications Browse medications A–Z › Every drug we've checked against herbs & supplements Ask a pharmacist › Free, personal answer from our licensed team
Pharmacist Counseling Corner

Taking Brussels Sprout and Acetaminophen, Chlorpheniramine, Phenylephrine, Salicylamide Together: Common Questions

Can you take Brussels Sprout with Acetaminophen, Chlorpheniramine, Phenylephrine, Salicylamide?
There is a moderate interaction, so it may be acceptable with monitoring or timing changes — but check with your pharmacist first. Read the full details on this page and confirm with your pharmacist before combining them.
Why are there 3 interactions listed for Brussels Sprout and Acetaminophen, Chlorpheniramine, Phenylephrine, Salicylamide?
Acetaminophen, Chlorpheniramine, Phenylephrine, Salicylamide belongs to more than one drug category, and Brussels Sprout interacts with each of those categories a little differently. We list every one so nothing is missed — your overall risk is driven by the most serious of them.
How serious is the Brussels Sprout and Acetaminophen, Chlorpheniramine, Phenylephrine, Salicylamide interaction?
We rate it Moderate. This combination may require monitoring, a dose adjustment, or separating the times you take each one. Consult your pharmacist before using them together.

Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy

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