The short answer
Not known in people. In lab tests on human liver tissue, arjuna bark extracts strongly blocked CYP3A4, an enzyme that breaks down atorvastatin. The atorvastatin label warns about medicines that block this enzyme. If arjuna did the same in the body, atorvastatin levels could rise. Rosuvastatin is handled differently, so the theory may not apply to it.
Nobody has measured statin levels in people taking arjuna. In a New Delhi study, heart patients took arjuna for years alongside their usual medicines, statins among them, but it was not designed to find an interaction. If you take a statin, tell your prescribing doctor before you start arjuna, and report any new muscle pain or weakness.
Statins sold in India include Atorva (atorvastatin), Rosuvas (rosuvastatin) and Simvotin (simvastatin).
At a glance
| What was seen | How it may work | Direction | Evidence |
|---|---|---|---|
| Arjuna bark extracts blocked CYP3A4 in the lab[1][3] | Enzyme inhibition in human liver microsomes | Could raise levels of statins cleared by CYP3A4, such as atorvastatin; not shown in people | In vitro |
| Long-term arjuna use alongside heart medicines that included statins[2] | Not studied | Gastritis in two people and constipation in one; no statin-specific results | Observational |
No listing is not a clearance. A missing interaction here never means a combination is safe.
The evidence, study by study
Laboratory study, Mumbai, 2015 In vitro
Alcohol and water extracts of arjuna bark strongly blocked three liver enzymes, CYP3A4, CYP2D6 and CYP2C9, in human liver tissue in the lab. Three single compounds from arjuna did not. The authors predict drug interactions, but no statin was tested. Lab findings like this show a possible route for an interaction. They do not show that one happens in people.[1]
Long-term study in coronary artery disease, New Delhi, 2019 Observational
Thirty-five heart patients took arjuna bark extract (500 mg three times a day) with their usual medicines, which included statins, for nine months to almost five years. Another 35 took the usual medicines alone. Two people on arjuna reported gastritis and one constipation. The study was small, measured no statin levels, and could not rule out rare problems.[2]
What your doctor may watch for
- New muscle aches, tenderness or weakness, which your doctor will want to hear about on any statin.
- Your cholesterol results, and liver tests or CK (a muscle enzyme) if your doctor thinks they are needed.
What to tell your prescribing doctor
You can read this out, or show them this page:
“I am taking, or planning to take, arjuna (name of product, for example Arjunarishta, and how much) along with my statin. A lab study found arjuna blocks CYP3A4, an enzyme that clears some statins. Is my statin one of them, and should anything be checked?”
Withheld until review
Questions people ask
Does it matter which statin I take?
It may. The lab finding concerns CYP3A4, which breaks down atorvastatin. Rosuvastatin is handled differently, so the theory may not carry over. We found no study that measured an interaction between arjuna and any statin.[1][3]
Is arjun chaal tea or Arjunarishta the same as the extract tested?
Not necessarily. The lab study used alcohol and water extracts of the bark. A small study of heart patients gave an arjuna extract alongside their usual medicines, statins among them, but it cannot tell us whether tea, churna, Arjunarishta or capsules act the same way. Their strength differs.[1][2]
Related
Arjunarishta
A fermented arjuna bark liquid used for the heart. It contains alcohol from fermentation, and the only study of it we found was in rats.
InteractionArjuna and blood thinners
In the lab, arjuna bark extract slowed platelet clumping and blocked enzymes that clear warfarin. We found no study of bleeding or INR with blood thinners.
InteractionAshwagandha and statins for cholesterol
Not studied in people. In the lab, an ashwagandha root extract changed CYP3A4, an enzyme named in atorvastatin's interaction warnings.
InteractionGuggulu and cholesterol medicines (statins)
Guggul raised rosuvastatin levels in rats, and lab work suggests it speeds up an enzyme that clears some statins. We found no study in people.
Sources
- Varghese A, Savai J, Pandita N, Gaud R. In vitro modulatory effects of Terminalia arjuna, arjunic acid, arjunetin and arjungenin on CYP3A4, CYP2D6 and CYP2C9 enzyme activity in human liver microsomes. Toxicol Rep. 2015;2:806-816. PMID 28962416.
- Dwivedi S, Chopra D, Bhandari B. Role of Terminalia arjuna Wight and Arn. in the treatment of chronic coronary artery disease from pharmacovigilance point of view. AYU. 2019;40(2):104-108. PMID 32398910.
- Atorvastatin calcium tablets, US prescribing information (DailyMed).
Updated 4 November 2026
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