Cowslip + Tocilizumab
Tocilizumab brand name: Actemra.
We found no known interaction between Cowslip and Tocilizumab in our sources. Absence of a documented interaction is not the same as proven safety, and does not guarantee one does not exist. Do not start, stop, or change a medication or supplement based on this page; confirm with your pharmacist or doctor first.
Cowslip and Tocilizumab
We checked these two against our interaction database. Here is what we found.
No Known Interaction Found
We did not find a documented interaction between Tocilizumab and Cowslip in our sources. This does not guarantee that the combination is completely free of risk — there is often limited research on supplements and herbal products, especially around drug interactions.
Worth understanding: our licensed dataset holds no drug-interaction record for Cowslip at all — not against Tocilizumab, and not against any other medication we track. This verdict therefore rests on the absence of any recorded data, not on research that looked at this combination and found nothing. We cannot rule an interaction out.
If you decide to take both, the practical routine is simple: add one new thing at a time and note the date you started it. If the combination is going to disagree with you, it usually shows in the first days to a couple of weeks — and a start date turns “I’ve been feeling off” into something a pharmacist can actually work with. Do not stop a prescribed medicine on your own.
Always talk with your pharmacist or doctor before making changes to your medications or supplements, particularly if you take several medications or have an ongoing health condition.
Cowslip safety at a glance
Safety guidance is general; always confirm with your pharmacist or doctor for your situation.
See Every Supplement That Interacts With Tocilizumab
This page covers Cowslip only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Tocilizumab page lists 89 supplements it has a documented interaction with, worst first, each one explained.
The most serious there right now: Beer (major), Siberian Cocklebur (major), Wine (major), Active Hexose Correlated Compound (ahcc) (moderate) and Alfalfa (moderate).
By severity: 3 major · 85 moderate · 1 minor.
From our pharmacist’s overview on the Tocilizumab page
“Tocilizumab (Actemra) calms an overactive immune system in conditions like rheumatoid arthritis, and it is also known to strain the liver, which is exactly where its supplement interactions concentrate. This page deserves genuine care.”
Reviewed by 2 · Jul 18, 2026
Taking Cowslip as Part of a Dietary Supplement Product? Check It for Interactions
We hold 21 real supplement products containing Cowslip, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Cowslip. Even though Cowslip itself has no known interaction with Tocilizumab, another ingredient on your label might. Find your product and we’ll check every ingredient on its label:
Where Cowslip and Tocilizumab 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.
#797 of 1,452 supplements looked up here in the last 7 days
#2,553 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.
Where does our data come from?
- Source: the Natural Medicines (TRC Healthcare) clinical database — the evidence-graded professional reference for herb & supplement interactions.
- Citation library: 103,510 references behind our interaction content, 65,311 of them resolved to verified PubMed/DOI sources. See every Cowslip reference on this page ↓
- Freshness: we automatically re-check this combination every week — this pair was last verified September 20, 2026. The Cowslip and Tocilizumab records this page draws on were last updated June 22, 2026.
- What “no known interaction” means: no documented interaction in the sources above — not a guarantee of safety. Supplements are studied far less than prescription drugs, so we say exactly what the evidence supports, and nothing more.
About Cowslip
What is Cowslip?
- Cough and chest congestion
- Bronchitis and sinus problems
- Trouble sleeping
- Anxiety and restlessness
- Headache
Cowslip is a traditional European herb whose flowers and roots have long been used as a tea or syrup, mainly for coughs and congestion. Solid human studies are very limited, so its benefits are not well proven. Talk with your pharmacist or doctor before using it, and avoid it during pregnancy and breastfeeding.
Primula veris · Primulaceae · Flowers and roots · Tea, tincture, syrup, capsules, dried herb
An interaction check asks whether these two react with each other — it does not ask whether Cowslip is a good idea for someone in your situation. Here is what our Cowslip record says about it on its own.
Cowslip: dosing
There is no well-established standardized dose for cowslip. Traditional use has involved teas made from the flowers or preparations of the root, but reliable dosing information from research is lacking.If you choose to use a cowslip product, follow the directions on the product label and do not exceed the suggested amount.
From our Cowslip monograph — the full record covers uses, side effects and every documented interaction.
About Tocilizumab Injection
What Is Tocilizumab Injection Used For?
Brand name: Actemra
Tocilizumab injection is used to treat several serious inflammatory and immune-related conditions. Actemra (tocilizumab) is indicated for moderately to severely active rheumatoid arthritis in adults who haven't responded well to other disease-modifying drugs, giant cell arteritis in adults, systemic sclerosis-associated interstitial lung disease (SSc-ILD) to slow lung function decline, polyarticular and systemic juvenile idiopathic arthritis in patients 2 years and older, and severe or life-threatening cytokine release syndrome (CRS) caused by CAR T-cell therapy in adults and children 2 and older.
Actemra is also approved for hospitalized adults and children aged 2 and older with COVID-19 who are on corticosteroids and need supplemental oxygen or mechanical breathing support. Not every brand or route is approved for every use — your prescriber will choose the right form for your specific condition.
Most-Reported Side Effects for Tocilizumab
From FAERS, the FDA’s public side-effect reporting system (113,819 reports, all brands). Reports are voluntary and are not proof the drug caused the effect.
Other Drugs & Cowslip
Browse every other medication we’ve checked against Cowslip — both the ones with a known interaction and the ones without. Select any drug for the full detail.
No drugs match “”.
No interaction 2,829 drugs checked — show the list
We also checked Cowslip against these medications and found no known interaction in our sources. Open any page to confirm.
- Apixaban ›
- Levothyroxine ›
- Amlodipine ›
- Methylphenidate ›
- Warfarin ›
- Sertraline ›
- Losartan Potassium ›
- Testosterone ›
- Ivermectin ›
- Abemaciclib ›
- Aspirin ›
- Metoprolol ›
- Acetaminophen ›
- Rosuvastatin ›
- Rivaroxaban ›
- Escitalopram ›
- Clopidogrel ›
- Atorvastatin ›
- Tadalafil ›
- Docusate ›
- Tirzepatide ›
- Ibuprofen ›
- Methamphetamine ›
- Hydroxyurea ›
- Valacyclovir ›
- Warfarin Sodium ›
- Sumatriptan ›
- Semaglutide ›
- Prednisone ›
- Lisdexamfetamine ›
- Propranolol ›
- Metformin ›
- Amitriptyline ›
- Lisinopril ›
- Amoxicillin ›
- Isotretinoin ›
- Methotrexate ›
- Amlodipine Besylate ›
- Bendamustine ›
- Bupropion ›
- Amphetamine ›
- Fluoxetine ›
- Doxycycline ›
- Acyclovir ›
- Azithromycin ›
- Lamotrigine ›
- Pregabalin ›
- Dextroamphetamine ›
- Gabapentin ›
- Acetaminophen, Codeine ›
- Quetiapine ›
- Clonazepam ›
- Levothyroxine, Liothyronine ›
- Naproxen ›
- Omeprazole ›
- Letrozole ›
- Methylene Blue ›
- Duloxetine ›
- Buspirone ›
- Citalopram ›
Showing the 60 most looked-up of 2,829 medications checked with no known interaction — see the full Cowslip list.
Cowslip References
The 3 references that drive our Cowslip monograph and interaction data, from the evidence-graded Natural Medicines (TRC Healthcare) database. Citations with a link open the study on PubMed or the publisher’s site.
- Neubauer N, Marz RW. Placebo-controlled, randomized, double-blind, clincal trial with Sinupret sugar coated tablets on the basis of a therapy with antibiotics and decongestant nasal drops in acute sinusitis. Phytomedicine 1994;1:177-81.
- Marz RW, Ismail C, Popp MA. Action profile and efficacy of a herbal combination preparation for the treatment of sinusitis. Wien Med Wochenschr 1999;149:202-8.
- Peric A, Kovacevic SV, Gacesa D, Peric AV. Efficacy and safety of combined treatment of acute rhinosinusitis by herbal medicinal product Sinupret and mometasone furoate nasal spray. ENT Updates 2017;7(2):68-74. DOI
Medication overviews come from MedlinePlus (NIH); supplement label data from the NIH Dietary Supplement Label Database. Content is written and reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.
Taking Cowslip and Tocilizumab Together: Common Questions
Is it safe to take Cowslip with Tocilizumab?
Does Tocilizumab interact with any supplements?
Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy
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Still Have a Question About Tocilizumab and Cowslip?
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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.