Ceylon Leadwort + Acetaminophen, Dextromethorphan, Doxylamine, Pseudoephedrine
Acetaminophen, Dextromethorphan, Doxylamine, Pseudoephedrine brand name: Vicks NyQuil.
Acetaminophen, Dextromethorphan, Doxylamine, Pseudoephedrine falls into 4 drug categories that Ceylon Leadwort can interact with; the most serious is rated moderate. Plumbagin, a constituent of Ceylon leadwort, has been shown to inhibit cytochrome P450 2D6 (CYP2D6) in vitro.
Read the full interaction reportCeylon Leadwort and Acetaminophen, Dextromethorphan, Doxylamine, Pseudoephedrine
These two interact in 4 distinct ways. Each one is explained separately below.
Why Are There 4 Interactions?
Ceylon Leadwort interacts with whole categories of medication. Acetaminophen, Dextromethorphan, Doxylamine, Pseudoephedrine falls into 4 of those categories, so it can interact with Ceylon Leadwort 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, Dextromethorphan, Doxylamine, Pseudoephedrine
Acetaminophen, Dextromethorphan, Doxylamine, Pseudoephedrine falls under CYTOCHROME P450 2D6 (CYP2D6) SUBSTRATES — the group Ceylon Leadwort interacts with.
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 medicine has one ingredient worth flagging here: dextromethorphan, the cough suppressant. Your body relies on an enzyme called CYP2D6 to clear it. A compound in Ceylon Leadwort, plumbagin, has been shown in lab dishes to slow that same enzyme down. In theory, that could let dextromethorphan build up a bit, leading to more dizziness, drowsiness, or a foggy, lightheaded feeling.
I want to be honest about how thin this evidence is. It comes only from test-tube studies and has never been reported in real people, so the risk is largely theoretical. Still, since NyQuil already makes you sleepy (thanks to the doxylamine too), it is worth a quick chat with your pharmacist before pairing them.
- Chen A, Zhou X, Tang S, Liu M, Wang X. Evaluation of the inhibition potential of plumbagin against cytochrome P450 using LC-MS/MS and cocktail approach. Sci Rep. 2016 Jun 22;6:28482. PubMed
CYTOCHROME P450 1A2 (CYP1A2) SUBSTRATES
2 of 4Acetaminophen, Dextromethorphan, Doxylamine, Pseudoephedrine also falls under CYTOCHROME P450 1A2 (CYP1A2) SUBSTRATES.
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.
NyQuil is a combination cold product, and the piece that matters here is dextromethorphan (the cough suppressant), which is partly handled by the CYP1A2 enzyme. In lab studies only, plumbagin from Ceylon Leadwort has been shown to slow this enzyme down. In theory, that could let dextromethorphan build up a bit, leading to more drowsiness, dizziness, or feeling foggy. Keep in mind this is paired with doxylamine, which is already quite sedating.
I want to be honest though: this comes from test-tube research only, with nothing reported in real people, so I wouldn't lose sleep over it. Still, since both products can make you sleepy, run it by your pharmacist before combining them.
- Chen A, Zhou X, Tang S, Liu M, Wang X. Evaluation of the inhibition potential of plumbagin against cytochrome P450 using LC-MS/MS and cocktail approach. Sci Rep. 2016 Jun 22;6:28482. PubMed
CYTOCHROME P450 3A4 (CYP3A4) SUBSTRATES
3 of 4Acetaminophen, Dextromethorphan, Doxylamine, Pseudoephedrine also falls under CYTOCHROME P450 3A4 (CYP3A4) SUBSTRATES.
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.
NyQuil is a combination product, and one of its ingredients, dextromethorphan (the cough suppressant), is partly handled by the CYP3A4 enzyme in your body. In lab studies only, plumbagin from Ceylon Leadwort has been shown to block that enzyme. If that happened in real people, dextromethorphan could build up a bit, which might mean more drowsiness, dizziness, or a foggy, lightheaded feeling on top of what the doxylamine antihistamine already causes.
The key thing to remember is this is theoretical, based on test-tube work, not actual human reports. So I wouldn't lose sleep over it, but since NyQuil already makes you sleepy, it's worth a quick chat with your pharmacist before pairing them, especially if you take Ceylon Leadwort regularly.
- Chen A, Zhou X, Tang S, Liu M, Wang X. Evaluation of the inhibition potential of plumbagin against cytochrome P450 using LC-MS/MS and cocktail approach. Sci Rep. 2016 Jun 22;6:28482. PubMed
CYTOCHROME P450 2E1 (CYP2E1) SUBSTRATES
4 of 4Acetaminophen, Dextromethorphan, Doxylamine, Pseudoephedrine also falls under CYTOCHROME P450 2E1 (CYP2E1) SUBSTRATES.
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 with NyQuil: it contains acetaminophen (Tylenol), and your liver uses an enzyme called CYP2E1 to handle part of that acetaminophen. In lab dishes, plumbagin from Ceylon Leadwort appears to slow that enzyme down. In plain terms, slowing CYP2E1 could shift how acetaminophen is processed. The good news is that the CYP2E1 pathway is actually the one that creates a toxic liver byproduct, so blocking it isn't necessarily harmful, but we just don't have human data to say for sure.
This is theoretical and based only on test-tube work, so I wouldn't lose sleep over it. Still, since acetaminophen is hard on the liver in large or frequent doses, it's worth a quick chat with your pharmacist before pairing the two.
- Chen A, Zhou X, Tang S, Liu M, Wang X. Evaluation of the inhibition potential of plumbagin against cytochrome P450 using LC-MS/MS and cocktail approach. Sci Rep. 2016 Jun 22;6:28482. PubMed
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.
Ceylon Leadwort Also Interacts With Other Medications
Ceylon Leadwort has 1,096 moderate known drug interactions in our database — the Acetaminophen, Dextromethorphan, Doxylamine, Pseudoephedrine one above is among them. If you take anything else, check it against the full list below.
Check Another of Your Medications Against Ceylon Leadwort
We haven’t checked that one against Ceylon Leadwort yet — ask our pharmacists directly.
Covers the 2,830 medications we’ve checked against Ceylon Leadwort. Pick one to open its full report.
See Every Supplement That Interacts With Acetaminophen, Dextromethorphan, Doxylamine, Pseudoephedrine
This page covers Ceylon Leadwort only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Acetaminophen, Dextromethorphan, Doxylamine, Pseudoephedrine page lists 286 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 · 227 moderate · 45 minor.
Open the Acetaminophen, Dextromethorphan, Doxylamine, Pseudoephedrine interaction page
Taking Ceylon Leadwort as Part of a Dietary Supplement Product? Check It for Interactions
We hold 96 real supplement products containing Ceylon Leadwort, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Ceylon Leadwort. Your product may carry other ingredients that interact with Acetaminophen, Dextromethorphan, Doxylamine, Pseudoephedrine too, on top of Ceylon Leadwort — and those would not show on this page. Find your product and we’ll check every ingredient on its label:
Where Ceylon Leadwort and Acetaminophen, Dextromethorphan, Doxylamine, 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.
#506 of 1,452 supplements looked up here in the last 7 days
#1,865 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 Ceylon Leadwort
What is Ceylon Leadwort?
- Digestive complaints and poor appetite
- Skin conditions and wounds (applied to the skin)
- Joint pain and swelling
- Traditional 'metabolism-boosting' tonics
- Antimicrobial folk remedy
Ceylon Leadwort (Plumbago zeylanica) is a plant long used in Ayurvedic and other traditional medicine systems, mainly for digestion, skin problems, and pain. Solid human studies are lacking, and the plant contains plumbagin, a compound that can irritate skin and tissues and may be unsafe in larger amounts. Talk to a pharmacist or doctor before using it, and avoid it in pregnancy.
Other Drugs & Ceylon Leadwort
Browse every other medication we’ve checked against Ceylon Leadwort — both the ones with a known interaction and the ones without. Select any drug for the full detail.
No drugs match “”.
1,096 interactions
- Diclofenac Sodium ›
- Diltiazem ›
- Theophylline ›
- Nifedipine ›
- Ibuprofen ›
- Aspirin ›
- Hydrocortisone ›
- Insulin (rdna) ›
- Naproxen ›
- Erythromycin ›
- Estradiol ›
- Minocycline ›
- Propranolol ›
- Lidocaine ›
- Norethindrone ›
- Testosterone ›
- Verapamil ›
- Levonorgestrel ›
- Prednisone ›
- Quinidine ›
- Cyclosporine ›
- Dexamethasone ›
- Glyburide ›
- Insulin (pork) ›
- Triazolam ›
- Zopiclone ›
- Bupropion ›
- Colchicine ›
- Fentanyl ›
- Flurbiprofen ›
- Orphenadrine ›
- Oxybutynin ›
- Oxycodone ›
- Phenytoin ›
- Prednisolone ›
- Tacrolimus ›
- Temazepam ›
- Triamcinolone ›
- Budesonide ›
- Carbamazepine ›
- Clindamycin ›
- Dextromethorphan ›
- Diclofenac Potassium ›
- Dipyridamole ›
- Doxorubicin ›
- Fluticasone ›
- Formoterol ›
- Indomethacin ›
- Insulin (human) ›
- Miconazole ›
- Morphine Sulfate ›
- Trimipramine ›
- Acetaminophen ›
- Amphetamine ›
- Buprenorphine ›
- Conjugated Estrogens ›
- Diazepam ›
- Everolimus ›
- Ivabradine ›
- Ketoprofen ›
Showing 60 of 1,096 moderate interactions — see all 1,096 on the Ceylon Leadwort page.
No interaction 1,733 drugs checked — show the list
We also checked Ceylon Leadwort against these medications and found no known interaction in our sources. Open any page to confirm.
- Levothyroxine ›
- Methylphenidate ›
- Ivermectin ›
- Rosuvastatin ›
- Escitalopram ›
- Docusate ›
- Valacyclovir ›
- Hydroxyurea ›
- Sumatriptan ›
- Lisinopril ›
- Amoxicillin ›
- Acyclovir ›
- Methotrexate ›
- Doxycycline ›
- Lamotrigine ›
- Pregabalin ›
- Azithromycin ›
- Gabapentin ›
- Isotretinoin ›
- Methylene Blue ›
- Ciprofloxacin ›
- Levothyroxine, Liothyronine ›
- Candesartan Cilexetil ›
- Cephalexin ›
- Cyclopentolate ›
- Acetaminophen, Dextromethorphan, Doxylamine ›
- Roxithromycin ›
- Mannitol ›
- Levetiracetam ›
- Pegunigalsidase Alfa-iwxj ›
- Ezetimibe ›
- Daptomycin ›
- Levothyroxine Sodium ›
- Dexmethylphenidate ›
- Spironolactone ›
- Amoxicillin, Clavulanate Potassium ›
- Hexobarbitone ›
- Phentermine, Topiramate ›
- Thyroid Hormone ›
- Carbidopa, Levodopa ›
- Factor 7a ›
- Levodopa ›
- Hethylphenidate Hcl ›
- Mitomycin ›
- Minoxidil ›
- Lenvatinib ›
- Cefaclor ›
- Azelaic Acid ›
- Phenylephrine ›
- Hydroxychloroquine ›
- Dirithromycin ›
- Vancomycin ›
- Pizotifen ›
- Triptorelin ›
- Bentoquatam ›
- Pentobarbitone ›
- Digoxin ›
- Ribavirin Aerosol ›
- Dextrothyroxine ›
- Procainamide ›
Showing the 60 most looked-up of 1,733 medications checked with no known interaction — see the full Ceylon Leadwort 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, Dextromethorphan, Doxylamine, Pseudoephedrine Is Linked to Lower Levels of One Nutrient
Natural Medicines records Acetaminophen, Dextromethorphan, Doxylamine, Pseudoephedrine as a medicine that can lower these. This is not an interaction with Ceylon Leadwort — 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 Ceylon Leadwort and Acetaminophen, Dextromethorphan, Doxylamine, Pseudoephedrine Together: Common Questions
Can you take Ceylon Leadwort with Acetaminophen, Dextromethorphan, Doxylamine, Pseudoephedrine?
Why are there 4 interactions listed for Ceylon Leadwort and Acetaminophen, Dextromethorphan, Doxylamine, Pseudoephedrine?
How serious is the Ceylon Leadwort and Acetaminophen, Dextromethorphan, Doxylamine, Pseudoephedrine interaction?
Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy
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