Acacia Rigidula + Acetaminophen, Dextromethorphan, Phenylpropanolamine, Pyrilamine
Acetaminophen, Dextromethorphan, Phenylpropanolamine, Pyrilamine brand name: Theracaps.
Acetaminophen, Dextromethorphan, Phenylpropanolamine, Pyrilamine falls into 3 drug categories that Acacia Rigidula can interact with; the most serious is rated moderate. Theoretically, Acacia rigidula products that are adulterated with beta-methylphenylethylamine (BMPEA) might increase the levels of CYP2D6 substrates.
Read the full interaction reportAcacia Rigidula and Acetaminophen, Dextromethorphan, Phenylpropanolamine, Pyrilamine
These two interact in 3 distinct ways. Each one is explained separately below.
Why Are There 3 Interactions?
Acacia Rigidula interacts with whole categories of medication. Acetaminophen, Dextromethorphan, Phenylpropanolamine, Pyrilamine falls into 3 of those categories, so it can interact with Acacia Rigidula in 3 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 3Why this applies to Acetaminophen, Dextromethorphan, Phenylpropanolamine, Pyrilamine
Acetaminophen, Dextromethorphan, Phenylpropanolamine, Pyrilamine falls under CYTOCHROME P450 2D6 (CYP2D6) SUBSTRATES — the group Acacia Rigidula interacts with.
In vitro research shows that BMPEA, an adulterant found in many Acacia rigidula products, strongly inhibits CYP2D6 enzyme.
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 thing about this combination product (Theracaps): one of its ingredients, dextromethorphan, the cough suppressant, is cleared from your body by a liver enzyme called CYP2D6. Some Acacia rigidula supplements have been found tainted with a stimulant called BMPEA, and lab studies suggest BMPEA can block that same enzyme. If it does, dextromethorphan could build up and cause more side effects like dizziness, drowsiness, confusion, or a jittery, restless feeling.
I'll be honest with you though, this concern comes only from test-tube research, not real people, so it's theoretical. The bigger worry is the supplement's hidden stimulant on top of the phenylpropanolamine already in your product. Please check with your pharmacist before pairing these.
- Liu Y, Santillo MF. Cytochrome P450 2D6 and 3A4 enzyme inhibition by amine stimulants in dietary supplements. Drug Test Anal. 2016;8(3-4):307-10. PubMed
CYTOCHROME P450 3A4 (CYP3A4) SUBSTRATES
2 of 3Acetaminophen, Dextromethorphan, Phenylpropanolamine, Pyrilamine also falls under CYTOCHROME P450 3A4 (CYP3A4) SUBSTRATES.
In vitro research shows that BMPEA, an adulterant found in many Acacia rigidula products, inhibits CYP3A4 enzyme by 37%.
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 thing to keep in mind with this combo cold-and-cough product (Theracaps). Some Acacia rigidula supplements are secretly spiked with a stimulant called BMPEA, and lab studies suggest it can mildly slow down a liver enzyme (CYP3A4) that helps break down certain medicines. Of the ingredients in Theracaps, dextromethorphan is the one most cleared this way, so in theory its levels could creep up a bit, which might mean more drowsiness, dizziness, or feeling foggy.
I want to be honest: this is only a test-tube finding, not something proven in people, so it may not amount to much in real life. But there's a bigger worry here. The stimulant amines in Acacia, layered on top of the decongestant phenylpropanolamine, could push your blood pressure and heart rate up. Please run this by your pharmacist or doctor before mixing the two.
- Liu Y, Santillo MF. Cytochrome P450 2D6 and 3A4 enzyme inhibition by amine stimulants in dietary supplements. Drug Test Anal. 2016;8(3-4):307-10. PubMed
STIMULANT DRUGS
3 of 3Acetaminophen, Dextromethorphan, Phenylpropanolamine, Pyrilamine also falls under STIMULANT DRUGS.
Constituents and adulterants found in Acacia rigidula can have stimulant effects.
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 thing about this combo cold product: one of its ingredients, phenylpropanolamine, is itself a stimulant-type decongestant. Acacia rigidula is sold for energy and weight loss, and some of these products carry their own stimulant compounds (and a few have even been found spiked with an unapproved stimulant called BMPEA). Stacking two stimulants together can layer their effects.
So in theory, taking them at the same time could nudge your blood pressure up or leave you with a racing heart, jitters, or trouble sleeping. To be fair, this is a theoretical concern based on how these ingredients work, not proven cases. Still, I'd skip the Acacia product or at least run it past your pharmacist or doctor first, especially if you have any heart or blood pressure history.
- Pawar RS, Grundel E, Fardin-Kia AR, Rader JI. Determination of selected biogenic amines in Acacia rigidula plant materials and dietary supplements using LC-MS/MS methods. J Pharm Biomed Anal. 2014 Jan;88:457-66. doi: 10.1016/j.jpba.2013.09.012. Epub 2013 PubMed
- Cohen PA, Bloszies C, Yee C, Gerona R. An amphetamine isomer whose efficacy and safety in humans has never been studied, ß-methylphenylethylamine (BMPEA), is found in multiple dietary supplements. Drug Test Anal. 2015 Apr 7. 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.
Acacia Rigidula Also Interacts With Other Medications
Acacia Rigidula has 814 moderate known drug interactions in our database — the Acetaminophen, Dextromethorphan, Phenylpropanolamine, Pyrilamine one above is among them. If you take anything else, check it against the full list below.
Check Another of Your Medications Against Acacia Rigidula
We haven’t checked that one against Acacia Rigidula yet — ask our pharmacists directly.
Covers the 2,830 medications we’ve checked against Acacia Rigidula. Pick one to open its full report.
See Every Supplement That Interacts With Acetaminophen, Dextromethorphan, Phenylpropanolamine, Pyrilamine
This page covers Acacia Rigidula only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Acetaminophen, Dextromethorphan, Phenylpropanolamine, Pyrilamine page lists 282 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 · 223 moderate · 45 minor.
From our pharmacist’s overview on the Acetaminophen, Dextromethorphan, Phenylpropanolamine, Pyrilamine page
“Of everything on this page, ephedra worries me most for anyone using Theracaps (acetaminophen, dextromethorphan, phenylpropanolamine, and pyrilamine), because the decongestant in this cold formula is itself a stimulant. Adding ephedra or any of the 44 stimulant entries can push blood pressure and heart rate to unsafe levels.”
Reviewed by 2 · Jul 18, 2026
Open the Acetaminophen, Dextromethorphan, Phenylpropanolamine, Pyrilamine interaction page
Where Acacia Rigidula and Acetaminophen, Dextromethorphan, Phenylpropanolamine, Pyrilamine 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.
#809 of 1,452 supplements looked up here in the last 7 days
#224 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 Acacia Rigidula
What is Acacia Rigidula?
- Weight loss
- Energy and stimulation
- Boosting metabolism
- Appetite control
- Pre-workout/athletic performance
Acacia rigidula is a shrub from Texas and Mexico that is marketed in weight-loss and energy supplements. There is very little reliable human evidence that it works, and some products have been found to contain an unapproved stimulant drug (BMPEA), which raises real safety concerns. Most people should avoid it and talk to a pharmacist or doctor before trying any product containing it.
Other Drugs & Acacia Rigidula
Browse every other medication we’ve checked against Acacia Rigidula — both the ones with a known interaction and the ones without. Select any drug for the full detail.
No drugs match “”.
814 interactions
- Diltiazem ›
- Nifedipine ›
- Phentermine ›
- Hydrocortisone ›
- Methylphenidate ›
- Erythromycin ›
- Estradiol ›
- Propranolol ›
- Lidocaine ›
- Norethindrone ›
- Testosterone ›
- Verapamil ›
- Levonorgestrel ›
- Phenylpropanolamine ›
- Prednisone ›
- Quinidine ›
- Cyclosporine ›
- Dexamethasone ›
- Triazolam ›
- Zopiclone ›
- Colchicine ›
- Fentanyl ›
- Nicotine ›
- Oxybutynin ›
- Oxycodone ›
- Prednisolone ›
- Tacrolimus ›
- Temazepam ›
- Budesonide ›
- Carbamazepine ›
- Clindamycin ›
- Dextromethorphan ›
- Doxorubicin ›
- Fluticasone ›
- Formoterol ›
- Miconazole ›
- Morphine Sulfate ›
- Phenylephrine ›
- Pseudoephedrine ›
- Amphetamine ›
- Buprenorphine ›
- Conjugated Estrogens ›
- Diazepam ›
- Diethylpropion ›
- Everolimus ›
- Ivabradine ›
- Lofepramine ›
- Medroxyprogesterone ›
- Medroxyprogesterone Acetate ›
- Nortriptyline ›
- Propoxyphene ›
- Rifampin ›
- Testosterone Undecanoate ›
- Aripiprazole ›
- Caffeine (otc Drug) ›
- Ciclesonide ›
- Clonazepam ›
- Cyclobenzaprine ›
- Dapsone ›
- Desipramine ›
Showing 60 of 814 moderate interactions — see all 814 on the Acacia Rigidula page.
No interaction 2,015 drugs checked — show the list
We also checked Acacia Rigidula against these medications and found no known interaction in our sources. Open any page to confirm.
- Levothyroxine ›
- Ivermectin ›
- Rosuvastatin ›
- Acetaminophen ›
- Aspirin ›
- Tirzepatide ›
- Ibuprofen ›
- Isotretinoin ›
- Levothyroxine, Liothyronine ›
- Metformin ›
- Docusate ›
- Semaglutide ›
- Sumatriptan ›
- Lisinopril ›
- Valacyclovir ›
- Amoxicillin ›
- Hydroxyurea ›
- Bupropion ›
- Methotrexate ›
- Azithromycin ›
- Doxycycline ›
- Pregabalin ›
- Gabapentin ›
- Naproxen ›
- Lamotrigine ›
- Acyclovir ›
- Bendamustine ›
- Methylene Blue ›
- Ciprofloxacin ›
- Candesartan Cilexetil ›
- Amoxicillin, Clavulanate Potassium ›
- Aluminum Hydroxide, Aspirin, Magnesium Hydroxide ›
- Acetylsalicylic Acid ›
- Acetaminophen, Aspirin ›
- Insulin Degludec, Liraglutide ›
- Calcium Oxybate, Magnesium Oxybate, Potassium Oxybate, Sodium Oxybate ›
- Aspirin, Butalbital ›
- Atenolol, Chlorthalidone ›
- Enalapril Maleate ›
- Ezetimibe ›
- Cephalexin ›
- Bendroflumethiazide, Rauwolfia Serpentina ›
- Bismuth Subcarbonate, Calcium Carbonate, Opium ›
- Rosiglitazone Maleate ›
- Sacubitril, Valsartan ›
- Aspirin, Ethoheptazine, Meprobamate ›
- Levetiracetam ›
- Insulin Aspart, Insulin Degludec ›
- Cyclopentolate ›
- Sulfamethoxazole, Trimethoprim ›
- Candesartan Cilexetil, Hydrochlorothiazide ›
- Canagliflozin, Metformin ›
- Levodopa ›
- Atenolol ›
- Daunorubicin, Cytarabine ›
- Isoniazid, Pyrazinamide, Rifampin ›
- Carbidopa, Levodopa ›
- Hydrocortisone, Clioquinol, Pramoxine ›
- Saxagliptin, Metformin Xr ›
- Sodium Bicarbonate (otc Drug) ›
Showing the 60 most looked-up of 2,015 medications checked with no known interaction — see the full Acacia Rigidula 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, Phenylpropanolamine, Pyrilamine Is Linked to Lower Levels of One Nutrient
Natural Medicines records Acetaminophen, Dextromethorphan, Phenylpropanolamine, Pyrilamine as a medicine that can lower these. This is not an interaction with Acacia Rigidula — 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 Acacia Rigidula and Acetaminophen, Dextromethorphan, Phenylpropanolamine, Pyrilamine Together: Common Questions
Can you take Acacia Rigidula with Acetaminophen, Dextromethorphan, Phenylpropanolamine, Pyrilamine?
Why are there 3 interactions listed for Acacia Rigidula and Acetaminophen, Dextromethorphan, Phenylpropanolamine, Pyrilamine?
How serious is the Acacia Rigidula and Acetaminophen, Dextromethorphan, Phenylpropanolamine, Pyrilamine interaction?
Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy
Still Have a Question About Acetaminophen, Dextromethorphan, Phenylpropanolamine, Pyrilamine and Acacia Rigidula?
Our pharmacists answer your medication & supplement questions — free.
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.