Schizonepeta + Acetaminophen, Chlorpheniramine, Dextromethorphan, Pseudoephedrine
Acetaminophen, Chlorpheniramine, Dextromethorphan, Pseudoephedrine brand names: Tylenol Cold Ex Strength, Children's Tylenol Cold Plus Cough.
Acetaminophen, Chlorpheniramine, Dextromethorphan, Pseudoephedrine falls into 4 drug categories that Schizonepeta can interact with; the most serious is rated moderate. Animal research suggests that schizonepetin, a monoterpene constituent of schizonepeta, inhibits cytochrome P450 (CYP) 2D6.
Read the full interaction reportSchizonepeta and Acetaminophen, Chlorpheniramine, Dextromethorphan, Pseudoephedrine
These two interact in 4 distinct ways. Each one is explained separately below.
Why Are There 4 Interactions?
Schizonepeta interacts with whole categories of medication. Acetaminophen, Chlorpheniramine, Dextromethorphan, Pseudoephedrine falls into 4 of those categories, so it can interact with Schizonepeta in 4 different ways. We’ve listed each one below — your overall risk is driven by the most serious of them (Moderate).
CYTOCHROME P450 2D6 (CYP2D6) SUBSTRATES
1 of 4Why this applies to Acetaminophen, Chlorpheniramine, Dextromethorphan, Pseudoephedrine
Acetaminophen, Chlorpheniramine, Dextromethorphan, Pseudoephedrine falls under CYTOCHROME P450 2D6 (CYP2D6) SUBSTRATES — the group Schizonepeta interacts with.
Some substrates of CYP2D6 include amitriptyline (Elavil), codeine, desipramine (Norpramin), flecainide (Tambocor), haloperidol (Haldol), imipramine (Tofranil), metoprolol (Lopressor, Toprol XL), ondansetron (Zofran), paroxetine (Paxil), risperidone (Risperdal), tramadol (Ultram), venlafaxine (Effexor), and others.
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.
This combo cold product has one ingredient worth flagging here: dextromethorphan, the cough suppressant. Your body relies on an enzyme called CYP2D6 to clear dextromethorphan. Schizonepeta may slow that enzyme down, so in theory the dextromethorphan could build up a bit and lead to stronger effects like drowsiness, dizziness, or feeling foggy.
I want to be honest about how thin this evidence is. It comes only from lab and animal research, not from real people, so the actual risk is likely small. The other ingredients (acetaminophen, chlorpheniramine, pseudoephedrine) aren't the main concern here. Still, if you plan to use Schizonepeta with this medicine, run it by your pharmacist or doctor first, especially if you already feel extra sleepy.
- Bao B, Geng T, Cao Y, et al. Effects of schizonepetin on activity of mRNA expression of cytochrome P450 enzymes in rats. Int J Mol Sci. 2012;13(12):17006-18.
CYTOCHROME P450 1A2 (CYP1A2) SUBSTRATES
2 of 4Acetaminophen, Chlorpheniramine, Dextromethorphan, Pseudoephedrine also falls under CYTOCHROME P450 1A2 (CYP1A2) SUBSTRATES.
Some substrates of 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.
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.
This is one of those combo cold products with four ingredients, and the concern here is mostly theoretical. The herb Schizonepeta may slow down a liver enzyme called CYP1A2. Of the ingredients in your product, that mainly touches the dextromethorphan (the cough suppressant), which leans on liver enzymes to clear out. In plain terms, if that pathway is blocked, a bit more dextromethorphan could hang around, which might mean more drowsiness, dizziness, or a foggy feeling.
Honestly though, this is based only on animal and lab studies, so we don't really know if it matters in people. I wouldn't lose sleep over it, but since this combo already causes sleepiness from the chlorpheniramine, just go easy and check with your pharmacist before pairing them.
- Bao B, Geng T, Cao Y, et al. Effects of schizonepetin on activity of mRNA expression of cytochrome P450 enzymes in rats. Int J Mol Sci. 2012;13(12):17006-18.
CYTOCHROME P450 3A4 (CYP3A4) SUBSTRATES
3 of 4Acetaminophen, Chlorpheniramine, Dextromethorphan, Pseudoephedrine also falls under CYTOCHROME P450 3A4 (CYP3A4) SUBSTRATES.
Some substrates of CYP3A4 include lovastatin (Mevacor), ketoconazole (Nizoral), itraconazole (Sporanox), fexofenadine (Allegra), triazolam (Halcion), and numerous others.
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.
This is a multi-symptom cold combo, and the piece most affected by this interaction is the dextromethorphan (the cough suppressant), which the body partly processes through the CYP3A4 pathway. The concern on file is that Schizonepeta might speed up that pathway, which could in theory lower dextromethorphan levels and make the cough-calming effect a bit weaker.
Honestly, I would not lose sleep over this one. The evidence comes only from lab and animal studies, not people, so it is theoretical. The other ingredients (acetaminophen for pain and fever, chlorpheniramine for sneezing, pseudoephedrine for congestion) are barely touched by this. Still, if you plan to use Schizonepeta regularly, it is worth a quick word with your pharmacist or doctor first.
- Bao B, Geng T, Cao Y, et al. Effects of schizonepetin on activity of mRNA expression of cytochrome P450 enzymes in rats. Int J Mol Sci. 2012;13(12):17006-18.
CYTOCHROME P450 2E1 (CYP2E1) SUBSTRATES
4 of 4Acetaminophen, Chlorpheniramine, Dextromethorphan, Pseudoephedrine also falls under CYTOCHROME P450 2E1 (CYP2E1) SUBSTRATES.
Some substrates of CYP2E1 include acetaminophen, chlorzoxazone (Parafon Forte), ethanol, theophylline, and anesthetics such as enflurane (Ethrane), halothane (Fluothane), isoflurane (Forane), and methoxyflurane (Penthrane).
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.
Here's the piece that matters in this cold-and-cough combo: the acetaminophen (the Tylenol part). One enzyme in your liver, called CYP2E1, helps break acetaminophen down. In lab and animal studies, a compound in Schizonepeta appears to slow that enzyme. In theory, that could let a bit more acetaminophen linger, which is mostly a concern for the liver if you're already taking a lot or drinking alcohol.
I want to be honest about how thin this evidence is. It comes from test-tube and animal work, not people, so the real-world risk is likely small. The other ingredients (chlorpheniramine, dextromethorphan, pseudoephedrine) aren't the issue here. Still, stay within the labeled acetaminophen dose, and run the combination by your pharmacist before mixing them.
- Bao B, Geng T, Cao Y, et al. Effects of schizonepetin on activity of mRNA expression of cytochrome P450 enzymes in rats. Int J Mol Sci. 2012;13(12):17006-18.
What These Ratings Mean
Every interaction above is graded three ways — here’s the key to each label.
Clinically significant. Avoid the combination, or use only under close professional supervision.
Usually worth avoiding or managing — may need monitoring, a dose change, or timing apart.
Generally not serious. Be aware of it and mention it to your pharmacist.
- 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.
- 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.
Schizonepeta Also Interacts With Other Medications
Schizonepeta has 796 moderate known drug interactions in our database — the Acetaminophen, Chlorpheniramine, Dextromethorphan, Pseudoephedrine one above is among them. If you take anything else, check it against the full list below.
Check Another of Your Medications Against Schizonepeta
We haven’t checked that one against Schizonepeta yet — ask our pharmacists directly.
Covers the 2,830 medications we’ve checked against Schizonepeta. Pick one to open its full report.
See Every Supplement That Interacts With Acetaminophen, Chlorpheniramine, Dextromethorphan, Pseudoephedrine
This page covers Schizonepeta only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Acetaminophen, Chlorpheniramine, Dextromethorphan, Pseudoephedrine page lists 301 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 · 242 moderate · 45 minor.
From our pharmacist’s overview on the Acetaminophen, Chlorpheniramine, Dextromethorphan, Pseudoephedrine page
“Because Tylenol Cold Extra Strength packs four drugs into one dose (acetaminophen, chlorpheniramine, dextromethorphan, and pseudoephedrine), its supplement list runs to 301 ingredients, and 14 carry a major rating, so I'd approach this one with real care. The biggest hazards mirror the drugs themselves.”
Reviewed by 2 · Jul 18, 2026
Open the Acetaminophen, Chlorpheniramine, Dextromethorphan, Pseudoephedrine interaction page
Taking Schizonepeta as Part of a Dietary Supplement Product? Check It for Interactions
We hold 285 real supplement products containing Schizonepeta, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Schizonepeta. Your product may carry other ingredients that interact with Acetaminophen, Chlorpheniramine, Dextromethorphan, Pseudoephedrine too, on top of Schizonepeta — and those would not show on this page. Find your product and we’ll check every ingredient on its label:
Where Schizonepeta and Acetaminophen, Chlorpheniramine, Dextromethorphan, Pseudoephedrine 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.
#385 of 1,452 supplements looked up here in the last 7 days
#105 of 2,830 medications looked up here in the last 7 days
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.
About Schizonepeta
What is Schizonepeta?
- Common cold and early-stage fever
- Itchy skin rashes and hives
- Sore throat
- Headache
- Measles and other skin eruptions (traditional use)
Schizonepeta is a mint-family herb long used in traditional Chinese medicine, usually as part of combination formulas for colds, fevers, and itchy skin conditions. Modern human evidence is very limited, so its benefits are not well proven. Talk to a pharmacist or doctor before using it, especially if you are pregnant, breastfeeding, or taking other medicines.
Other Drugs & Schizonepeta
Browse every other medication we’ve checked against Schizonepeta — both the ones with a known interaction and the ones without. Select any drug for the full detail.
No drugs match “”.
796 interactions
- Diltiazem ›
- Theophylline ›
- Nifedipine ›
- Hydrocortisone ›
- Naproxen ›
- Erythromycin ›
- Estradiol ›
- Propranolol ›
- Lidocaine ›
- Norethindrone ›
- Testosterone ›
- Verapamil ›
- Levonorgestrel ›
- Prednisone ›
- Quinidine ›
- Cyclosporine ›
- Dexamethasone ›
- Triazolam ›
- Zopiclone ›
- Colchicine ›
- Fentanyl ›
- Oxybutynin ›
- Oxycodone ›
- Prednisolone ›
- Tacrolimus ›
- Temazepam ›
- Budesonide ›
- Carbamazepine ›
- Clindamycin ›
- Dextromethorphan ›
- Doxorubicin ›
- Fluticasone ›
- Formoterol ›
- Miconazole ›
- Morphine Sulfate ›
- Acetaminophen ›
- Amphetamine ›
- Buprenorphine ›
- Conjugated Estrogens ›
- Diazepam ›
- Everolimus ›
- Ivabradine ›
- Lofepramine ›
- Medroxyprogesterone ›
- Medroxyprogesterone Acetate ›
- Nortriptyline ›
- Propoxyphene ›
- Rifampin ›
- Testosterone Undecanoate ›
- Aripiprazole ›
- Bendamustine ›
- Caffeine (otc Drug) ›
- Ciclesonide ›
- Clonazepam ›
- Cyclobenzaprine ›
- Dapsone ›
- Desipramine ›
- Doxepin ›
- Duloxetine ›
- Erythromycin Ethylsuccinate ›
Showing 60 of 796 moderate interactions — see all 796 on the Schizonepeta page.
No interaction 2,033 drugs checked — show the list
We also checked Schizonepeta against these medications and found no known interaction in our sources. Open any page to confirm.
- Levothyroxine ›
- Methylphenidate ›
- Ivermectin ›
- Aspirin ›
- Rosuvastatin ›
- Escitalopram ›
- Docusate ›
- Tirzepatide ›
- Ibuprofen ›
- Hydroxyurea ›
- Valacyclovir ›
- Sumatriptan ›
- Semaglutide ›
- Metformin ›
- Lisinopril ›
- Amoxicillin ›
- Isotretinoin ›
- Methotrexate ›
- Bupropion ›
- Doxycycline ›
- Acyclovir ›
- Azithromycin ›
- Lamotrigine ›
- Pregabalin ›
- Gabapentin ›
- Levothyroxine, Liothyronine ›
- Methylene Blue ›
- Ciprofloxacin ›
- Candesartan Cilexetil ›
- Amoxicillin, Clavulanate Potassium ›
- Acetaminophen, Dextromethorphan, Doxylamine ›
- Cyclopentolate ›
- Cephalexin ›
- Roxithromycin ›
- Mannitol ›
- Levetiracetam ›
- Ezetimibe ›
- Acetylsalicylic Acid ›
- Phentermine, Topiramate ›
- Spironolactone ›
- Dexmethylphenidate ›
- Levothyroxine Sodium ›
- Carbidopa, Levodopa ›
- Thyroid Hormone ›
- Pizotifen ›
- Valsartan ›
- Daptomycin ›
- Hexobarbitone ›
- Levodopa ›
- Lenvatinib ›
- Mitomycin ›
- Flutemetamol F-18 ›
- Canagliflozin, Metformin ›
- Insulin Degludec, Liraglutide ›
- Magnesium Hydroxide (otc Drug) ›
- Pegunigalsidase Alfa-iwxj ›
- Bentoquatam ›
- Cefaclor ›
- Alglucosidase Alpha ›
- Sacubitril, Valsartan ›
Showing the 60 most looked-up of 2,033 medications checked with no known interaction — see the full Schizonepeta list.
Sources & How We Checked
Interaction details are evidence-graded and sourced from the Natural Medicines database. The medication overview comes from MedlinePlus.
- Natural Medicines (Therapeutic Research Center) — Evidence-graded clinical reference for vitamins, herbs and supplements — the basis for our interaction data.
- MedlinePlus, U.S. National Library of Medicine — NIH consumer drug information, used for the medication overviews.
- NIH Dietary Supplement Label Database (DSLD) — Official supplement product labels.
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
Acetaminophen, Chlorpheniramine, Dextromethorphan, Pseudoephedrine Is Linked to Lower Levels of One Nutrient
Natural Medicines records Acetaminophen, Chlorpheniramine, Dextromethorphan, Pseudoephedrine as a medicine that can lower these. This is not an interaction with Schizonepeta — it is a separate effect of the medicine, and it is a reason some people are advised to supplement rather than to avoid one:
Depletion records come from the licensed Natural Medicines database. Do not start a supplement on the strength of this page — ask your pharmacist or doctor whether it applies to you.
Taking Schizonepeta and Acetaminophen, Chlorpheniramine, Dextromethorphan, Pseudoephedrine Together: Common Questions
Can you take Schizonepeta with Acetaminophen, Chlorpheniramine, Dextromethorphan, Pseudoephedrine?
Why are there 4 interactions listed for Schizonepeta and Acetaminophen, Chlorpheniramine, Dextromethorphan, Pseudoephedrine?
How serious is the Schizonepeta and Acetaminophen, Chlorpheniramine, Dextromethorphan, Pseudoephedrine interaction?
Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy
Still Have a Question About Acetaminophen, Chlorpheniramine, Dextromethorphan, Pseudoephedrine and Schizonepeta?
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This information is for education only and is not a substitute for professional medical advice. Always check with your pharmacist or doctor before starting, stopping, or combining supplements and medications.