Drug & supplement interaction

Hibiscus Sabdariffa + Acetaminophen, Chlorpheniramine, Dextromethorphan

Acetaminophen, Chlorpheniramine, Dextromethorphan brand name: Coricidin II Extra Strength Cold and Flu.

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

Acetaminophen, Chlorpheniramine, Dextromethorphan falls into 5 drug categories that Hibiscus Sabdariffa can interact with; the most serious is rated minor. Theoretically, Hibiscus sabdariffa extract might reduce the metabolism of CYP1A2 substrates.

Read the full interaction report
SeverityMinor
LikelihoodPossible
Interactions5
EvidenceD
What do Severity, Likelihood & Evidence mean?
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Interaction report

Hibiscus Sabdariffa and Acetaminophen, Chlorpheniramine, Dextromethorphan

These two interact in 5 distinct ways. Each one is explained separately below.

Why Are There 5 Interactions?

Hibiscus Sabdariffa interacts with whole categories of medication. Acetaminophen, Chlorpheniramine, Dextromethorphan falls into 5 of those categories, so it can interact with Hibiscus Sabdariffa in 5 different ways. We’ve listed each one below — your overall risk is driven by the most serious of them (Minor).

Minor

CYTOCHROME P450 1A2 (CYP1A2) SUBSTRATES

1 of 5

Why this applies to Acetaminophen, Chlorpheniramine, Dextromethorphan

Acetaminophen, Chlorpheniramine, Dextromethorphan falls under CYTOCHROME P450 1A2 (CYP1A2) SUBSTRATES — the group Hibiscus Sabdariffa interacts with.

Theoretically, Hibiscus sabdariffa extract might reduce the metabolism of CYP1A2 substrates.
In vitro research shows that Hibiscus sabdariffa calyx extract inhibits CYP1A2. This interaction has not been reported in humans.
Severity Minor 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

Coricidin combines acetaminophen (a pain and fever reducer), chlorpheniramine (an antihistamine), and dextromethorphan (a cough suppressant). The concern here is that lab studies suggest hibiscus extract may slow down a liver enzyme called CYP1A2, which helps process certain medicines. In theory, that could let some of these ingredients linger a bit longer in your body, possibly nudging up side effects like drowsiness, dry mouth, or dizziness.

That said, I want to keep this in perspective. This was only seen in a test tube, never in real people, and the effect is rated minor. A regular cup of hibiscus tea is very unlikely to cause trouble. If you take concentrated hibiscus supplements, it's worth a quick word with your pharmacist or doctor first.

Contact Dr. Brian directly if you have additional questions on this interaction
References
  1. Johnson SS, Oyelola FT, Ari T, Juho H. In vitro inhibitory activities of the extract of Hibiscus sabdariffa L. (family Malvaceae) on selected cytochrome P450 isoforms. Afr J Tradit Complement Altern Med. 2013 Apr 12;10(3):533-40.
Minor

CYTOCHROME P450 2D6 (CYP2D6) SUBSTRATES

2 of 5

Acetaminophen, Chlorpheniramine, Dextromethorphan also falls under CYTOCHROME P450 2D6 (CYP2D6) SUBSTRATES.

Theoretically, Hibiscus sabdariffa extract might reduce the metabolism of CYP2D6 substrates.
In vitro research shows that Hibiscus sabdariffa calyx extract inhibits CYP2D6. This interaction has not been reported in humans.
Severity Minor 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

In this combo cold product, the cough suppressant dextromethorphan is the piece that leans on a liver enzyme called CYP2D6. Lab (test-tube) studies hint that concentrated hibiscus extract may slow that enzyme down a bit. If that happened in real life, your body might clear dextromethorphan a little more slowly, so it could build up and possibly bring on more drowsiness, dizziness, or stomach upset. The acetaminophen and chlorpheniramine pieces aren't really driving this concern.

Here's the reassuring part: this is only a theoretical interaction. It has not been reported in actual people, and a cup of tart hibiscus tea is very unlikely to matter. If you're using strong hibiscus supplements regularly, just mention it to your pharmacist.

Contact Dr. Brian directly if you have additional questions on this interaction
References
  1. Johnson SS, Oyelola FT, Ari T, Juho H. In vitro inhibitory activities of the extract of Hibiscus sabdariffa L. (family Malvaceae) on selected cytochrome P450 isoforms. Afr J Tradit Complement Altern Med. 2013 Apr 12;10(3):533-40.
Minor

CYTOCHROME P450 3A4 (CYP3A4) SUBSTRATES

3 of 5

Acetaminophen, Chlorpheniramine, Dextromethorphan also falls under CYTOCHROME P450 3A4 (CYP3A4) SUBSTRATES.

Theoretically, Hibiscus sabdariffa extract might reduce the metabolism of CYP3A4 substrates.
In vitro research shows that Hibiscus sabdariffa calyx extract inhibits CYP3A4. This interaction has not been reported in humans.
Severity Minor 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

This cold and flu combo (Coricidin) blends acetaminophen, the antihistamine chlorpheniramine, and the cough suppressant dextromethorphan. In lab dishes, concentrated hibiscus extract slowed down an enzyme called CYP3A4, which helps break down dextromethorphan in particular. In theory, if that enzyme is blocked, a bit more of the drug could linger, which might mean slightly more drowsiness, dizziness, or dry mouth than usual.

The reassuring part: this is purely theoretical and has never actually been seen in people. A cup or two of hibiscus tea is very unlikely to cause any noticeable problem. Concentrated hibiscus supplements are the bigger unknown, so if you take those regularly, just run it by your pharmacist or doctor first.

Contact Dr. Brian directly if you have additional questions on this interaction
References
  1. Johnson SS, Oyelola FT, Ari T, Juho H. In vitro inhibitory activities of the extract of Hibiscus sabdariffa L. (family Malvaceae) on selected cytochrome P450 isoforms. Afr J Tradit Complement Altern Med. 2013 Apr 12;10(3):533-40.
Minor

ACETAMINOPHEN (Tylenol, others)

4 of 5
Theoretically, taking Hibiscus sabdariffa with acetaminophen might decrease the clinical effects of acetaminophen.
There is some evidence that consuming a Hibiscus sabdariffa beverage (Zobo drink) before taking acetaminophen can decrease the elimination half-life of acetaminophen. Hibiscus sabdariffa does not seem to decrease maximum concentration or area under the curve of acetaminophen. The clinical significance of this is unknown.
Severity Minor 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 product (Coricidin) contains three ingredients, but the interaction on file only involves the acetaminophen piece. There's some early research showing that drinking hibiscus (the tart Zobo drink) before taking acetaminophen made the body clear it a little faster. In plain terms, the pain and fever relief from the acetaminophen might wear off a bit sooner.

Honestly, the real-world impact here is pretty small and uncertain. The studies didn't show a big drop in how much acetaminophen got into the blood, so most people won't notice a difference. A cup of hibiscus tea is unlikely to be a problem. If you rely on this medicine for fever or aches and feel it isn't lasting, just mention it to your pharmacist.

Contact Dr. Brian directly if you have additional questions on this interaction
References
  1. Kolawole JA, Maduenyi A. Effect of zobo drink (Hibiscus sabdariffa water extract) on pharmacokinetics of acetaminophen in human volunteers. Eur J Drug Metab Pharmacokinet 2004;29:25-9.
Minor

CYTOCHROME P450 2E1 (CYP2E1) SUBSTRATES

5 of 5

Acetaminophen, Chlorpheniramine, Dextromethorphan also falls under CYTOCHROME P450 2E1 (CYP2E1) SUBSTRATES.

Theoretically, Hibiscus sabdariffa extract might reduce the metabolism of CYP2E1 substrates.
In vitro research shows that Hibiscus sabdariffa calyx extract inhibits CYP2E1. This interaction has not been reported in humans.
Severity Minor 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 piece that matters in this combo cold medicine: the acetaminophen (the Tylenol component) is handled in part by a liver enzyme called CYP2E1. Lab studies in test tubes suggest hibiscus extract may slow that enzyme down a bit. In theory, slower breakdown could mean a little more acetaminophen lingering around. The reassuring news is this has never actually been seen in real people, and it's rated only a minor concern based on pharmacology alone.

For most folks, a cup of tart hibiscus tea alongside an occasional dose isn't something I'd lose sleep over. I'd just be mindful of total acetaminophen from all sources, and if you use concentrated hibiscus supplements daily, mention it to your pharmacist so they can keep an eye on things.

Contact Dr. Brian directly if you have additional questions on this interaction
References
  1. Johnson SS, Oyelola FT, Ari T, Juho H. In vitro inhibitory activities of the extract of Hibiscus sabdariffa L. (family Malvaceae) on selected cytochrome P450 isoforms. Afr J Tradit Complement Altern Med. 2013 Apr 12;10(3):533-40.

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

Hibiscus Sabdariffa Also Interacts With Other Medications

Hibiscus Sabdariffa has 2 major, 266 moderate, 818 minor known drug interactions in our database — the Acetaminophen, Chlorpheniramine, Dextromethorphan one above is among them. If you take anything else, check it against the full list below.

Major 2 Moderate 266 Minor 818 No known interaction 1,744 (incl. Acetaminophen, Chlorpheniramine, Dextromethorphan)
Taking anything else?

Check Another of Your Medications Against Hibiscus Sabdariffa

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

Everything else you take

See Every Supplement That Interacts With Acetaminophen, Chlorpheniramine, Dextromethorphan

This page covers Hibiscus Sabdariffa only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Acetaminophen, Chlorpheniramine, Dextromethorphan page lists 275 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), Grapefruit (major) and Henbane (major).

By severity: 10 major · 220 moderate · 45 minor.

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

“Alcohol is the risk to understand first. It carries major ratings alongside the acetaminophen, chlorpheniramine, and dextromethorphan combination sold as Coricidin II Extra Strength Cold and Flu, because acetaminophen already taxes the liver, and heavy drinking on top of it raises the chance of genuine liver injury.”

Reviewed by 2 · Jul 18, 2026

Open the Acetaminophen, Chlorpheniramine, Dextromethorphan interaction page

How much people look this up

Where Hibiscus Sabdariffa and Acetaminophen, Chlorpheniramine, Dextromethorphan 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 Hibiscus Sabdariffa
Top half

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

29 days ago today
Medication Acetaminophen, Chlorpheniramine, Dextromethorphan
Steady interest

#1,687 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 Hibiscus Sabdariffa

What is Hibiscus Sabdariffa?

Hibiscus Sabdariffa
  • High blood pressure
  • Heart and cholesterol health
  • Digestive upset
  • Antioxidant support
  • Fever and general wellness

Hibiscus sabdariffa is a tart, cranberry-flavored plant most often consumed as a tea, and its best-studied use is for mildly lowering blood pressure. Evidence for other uses is limited, and while hibiscus tea is generally well tolerated in food amounts, concentrated supplements should be used cautiously and avoided in pregnancy. Talk to your pharmacist or doctor before using it for a medical condition.

Read the full Hibiscus Sabdariffa monograph & all interactions
Keep checking

Other Drugs & Hibiscus Sabdariffa

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

2Major
266Moderate
818Minor
1,743No known interaction
2 Major 266 Moderate 818 Minor 1,743 No interaction
Major

2 interactions

Moderate

266 interactions

Showing 60 of 266 moderate interactions — see all 266 on the Hibiscus Sabdariffa page.

Minor

818 interactions

Showing 60 of 818 minor interactions — see all 818 on the Hibiscus Sabdariffa page.

No interaction 1,743 drugs checked — show the list

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

Showing the 60 most looked-up of 1,743 medications checked with no known interaction — see the full Hibiscus Sabdariffa list.

See the full Hibiscus Sabdariffa interactions page
See every supplement checked against Acetaminophen, Chlorpheniramine, Dextromethorphan, 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
Hibiscus Sabdariffa monograph › Uses, safety, and every drug interaction in one place Acetaminophen, Chlorpheniramine, Dextromethorphan supplement interactions › Every supplement checked against Acetaminophen, Chlorpheniramine, Dextromethorphan, 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 Hibiscus Sabdariffa and Acetaminophen, Chlorpheniramine, Dextromethorphan Together: Common Questions

Can you take Hibiscus Sabdariffa with Acetaminophen, Chlorpheniramine, Dextromethorphan?
There is only a minor interaction, which is usually not serious. Read the full details on this page and confirm with your pharmacist before combining them.
Why are there 5 interactions listed for Hibiscus Sabdariffa and Acetaminophen, Chlorpheniramine, Dextromethorphan?
Acetaminophen, Chlorpheniramine, Dextromethorphan belongs to more than one drug category, and Hibiscus Sabdariffa 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 Hibiscus Sabdariffa and Acetaminophen, Chlorpheniramine, Dextromethorphan interaction?
We rate it Minor. This interaction is generally not clinically significant, but it remains worth noting and discussing with your pharmacist.

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

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