Drug & supplement interaction

Onion + Dapagliflozin

Dapagliflozin brand name: Farxiga.

Moderate Interaction
Medically reviewed by · Updated September 2026
The bottom line Moderate

Onion has a moderate interaction with Dapagliflozin. Concomitant use of antidiabetes drugs with onion may increase the risk of hypoglycemia.

Read the full interaction report
SeverityModerate
LikelihoodPossible
EvidenceB
What do Severity, Likelihood & Evidence mean?
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Interaction report

Onion and Dapagliflozin

Here is the interaction we found between these two, with the evidence behind it.

Moderate

ANTIDIABETES DRUGS

Why this applies to Dapagliflozin

Dapagliflozin falls under ANTIDIABETES DRUGS — the group Onion interacts with.

Concomitant use of antidiabetes drugs with onion may increase the risk of hypoglycemia.
Animal research and clinical research shows that taking onion can lower blood glucose levels. Monitor blood glucose levels closely.
Severity Moderate Likelihood Possible Evidence B

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.

Dr. Brian Staiger, PharmD, BCPS
Dr. Brian Staiger explains PharmD, Clinical Pharmacist

Here's the simple version: onion itself can nudge your blood sugar a little lower. Since dapagliflozin (Farxiga) is already working to bring your sugar down by helping your kidneys flush out glucose, adding concentrated onion supplements on top could push your numbers lower than expected. That can show up as shakiness, sweating, dizziness, or feeling lightheaded if your blood sugar dips too far.

One reassuring point: the evidence here comes from animal work and a few lower-quality human studies, so this is a possible effect, not a sure thing. Eating onion in normal cooking amounts is very unlikely to cause trouble. The bigger question is high-dose onion supplements. If you're considering one, check in with your pharmacist or doctor first, and keep an eye on your home glucose readings.

Contact Dr. Brian directly if you have additional questions on this interaction
References
  1. Brinker F. Herb Contraindications and Drug Interactions. 2nd ed. Sandy, OR: Eclectic Medical Publications, 1998.
  2. Mathew, P. T. and Augusti, K. T. Hypoglycaemic effects of onion, Allium cepa Linn. on diabetes mellitus - a preliminary report. Indian J.Physiol Pharmacol. 1975;19(4):213-217.
  3. Campos, K. E., Diniz, Y. S., Cataneo, A. C., Faine, L. A., Alves, M. J., and Novelli, E. L. Hypoglycaemic and antioxidant effects of onion, Allium cepa: dietary onion addition, antioxidant activity and hypoglycaemic effects on diabetic rats. Int J Food S
  4. El Demerdash, F. M., Yousef, M. I., and El Naga, N. I. Biochemical study on the hypoglycemic effects of onion and garlic in alloxan-induced diabetic rats. Food Chem.Toxicol. 2005;43(1):57-63. PubMed
  5. Kook, S., Kim, G. H., and Choi, K. The antidiabetic effect of onion and garlic in experimental diabetic rats: meta-analysis. J Med Food 2009;12(3):552-560. PubMed
  6. Sharma, K. K., Gupta, R. K., Gupta, S., and Samuel, K. C. Antihyperglycemic effect of onion: effect on fasting blood sugar and induced hyperglycemia in man. Indian J.Med.Res. 1977;65(3):422-429.
  7. Jain, R. C., Vyas, C. R., and Mahatma, O. P. Letter: Hypoglycaemic action of onion and garlic. Lancet 12-29-1973;2(7844):1491.
  8. Jain, R. C. and Vyas, C. R. Letter: Hypoglycaemia action of onion on rabbits. Br.Med.J. 6-29-1974;2(5921):730. PubMed
  9. Tjokroprawiro, A., Pikir, B. S., Budhiarta, A. A., Pranawa, Soewondo, H., Donosepoetro, M., Budhianto, F. X., Wibowo, J. A., Tanuwidjaja, S. J., Pangemanan, M., and . Metabolic effects of onion and green beans on diabetic patients. Tohoku J Exp Med 1983; PubMed
  10. Akash MS, Rehman K, Chen S. Spice plant Allium cepa: dietary supplement for treatment of type 2 diabetes mellitus. Nutrition 2014;30(10):1128-37. PubMed
  11. Eldin IM, Ahmed EM, HM AE. Preliminary study of the clinical hypoglycemic effects of Allium cepa (red onion) in type 1 and type 2 diabetic patients. Environmental health insights 2010;4:71. PubMed

What These Ratings Mean

Every interaction above is graded three ways — here’s the key to each label.

Severity how clinically significant the interaction is
Major

Clinically significant. Avoid the combination, or use only under close professional supervision.

Moderate

Usually worth avoiding or managing — may need monitoring, a dose change, or timing apart.

Minor

Generally not serious. Be aware of it and mention it to your pharmacist.

Likelihood how strong the evidence is that the interaction actually happens in people
  • 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.
Evidence the quality of the studies behind the rating (graded A–D)
  • 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.

Keep it in perspective

Onion Also Interacts With Other Medications

Onion has 274 moderate known drug interactions in our database — the Dapagliflozin one above is one of them. If you take anything else, check it against the full list below.

Moderate 274 No known interaction 2,556 (incl. Dapagliflozin)
Taking anything else?

Check Another of Your Medications Against Onion

Covers the 2,830 medications we’ve checked against Onion. Pick one to open its full report.

From our Q&A

Questions About Onion or Dapagliflozin

These are real questions from readers, answered by the pharmacists at HelloPharmacist — written by a person, not generated from a database. Each one covers Onion or Dapagliflozin, not necessarily both, but if one is close to what you were about to ask it will usually go further than a database entry can:

Not quite your question? Ask our pharmacists directly — it is free, there is no account required, and answers usually come back within 24 hours.

Everything else you take

See Every Supplement That Interacts With Dapagliflozin

This page covers Onion only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Dapagliflozin page lists 256 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Siberian Cocklebur (major), Acai (moderate), African Wild Potato (moderate) and Agaricus Mushroom (moderate).

By severity: 2 major · 215 moderate · 39 minor.

From our pharmacist’s overview on the Dapagliflozin page

“Dapagliflozin (Farxiga) lowers blood sugar through the kidneys, and I ask anyone taking it to treat this supplement list with real care. Of the 256 ingredients on this list, 239 touch blood sugar control, and two rate major: Siberian cocklebur has caused severe hypoglycemia, dangerously low blood sugar, in people who ate it, and activa…”

Reviewed by 2 · Jul 18, 2026

Open the Dapagliflozin interaction page

One more smart check

Taking Onion as Part of a Dietary Supplement Product? Check It for Interactions

We hold 1,061 real supplement products containing Onion, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Onion. Your product may carry other ingredients that interact with Dapagliflozin too, on top of Onion — and those would not show on this page. Find your product and we’ll check every ingredient on its label:

How much people look this up

Where Onion and Dapagliflozin 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.

Supplement Onion
Top 25%

#243 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Dapagliflozin
Top half

#1,066 of 2,830 medications looked up here in the last 7 days

29 days ago today

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.

Supplement

About Onion

What is Onion?

Onion
  • Colds and respiratory symptoms
  • Heart and cholesterol health
  • Blood sugar support
  • Antimicrobial and wound care
  • Scar appearance (topical gels)

Onion is a common food with a long history in traditional medicine, and it contains antioxidants like quercetin and sulfur compounds. Eating onion as part of a balanced diet is safe for most people, but high-dose supplements have only limited human evidence for any specific health condition. Talk with your pharmacist or doctor before using concentrated onion products for a medical reason.

Read the full Onion monograph & all interactions
Medication

About Dapagliflozin

What Is Dapagliflozin Used For?

Brand name: Farxiga

Dapagliflozin is used for several serious conditions. It helps improve blood sugar control in adults and children aged 10 and older with type 2 diabetes (alongside diet and exercise). It also reduces the risk of hospitalization for heart failure in adults with type 2 diabetes who have established cardiovascular disease or multiple cardiovascular risk factors.

Farxiga (dapagliflozin) is additionally approved to reduce the risk of cardiovascular death, hospitalization, and urgent visits due to heart failure in adults with heart failure — and to slow the progression of chronic kidney disease, including reducing the risk of kidney failure and cardiovascular death, in adults with chronic kidney disease at risk of getting worse.

See full Dapagliflozin drug information
Keep checking

Other Drugs & Onion

Browse every other medication we’ve checked against Onion — both the ones with a known interaction and the ones without. Select any drug for the full detail.

0Major
274Moderate
0Minor
2,555No known interaction
274 Moderate 2,555 No interaction
Moderate

274 interactions

Showing 60 of 274 moderate interactions — see all 274 on the Onion page.

No interaction 2,555 drugs checked — show the list

We also checked Onion against these medications and found no known interaction in our sources. Open any page to confirm.

Showing the 60 most looked-up of 2,555 medications checked with no known interaction — see the full Onion list.

See the full Onion interactions page
See every supplement checked against Dapagliflozin, ranked by severity
Sources

Sources & How We Checked

Interaction details are evidence-graded and sourced from the Natural Medicines database. The medication overview comes from MedlinePlus.

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

Keep exploring
Onion monograph › Uses, safety, and every drug interaction in one place Dapagliflozin supplement interactions › Every supplement checked against Dapagliflozin, ranked by severity Dapagliflozin drug information › The full plain-English guide to this medication Supplement interaction checker › Check any supplement or product against your medications Browse medications A–Z › Every drug we've checked against herbs & supplements Ask a pharmacist › Free, personal answer from our licensed team
Pharmacist Counseling Corner

Taking Onion and Dapagliflozin Together: Common Questions

Can you take Onion with Dapagliflozin?
There is a moderate interaction, so it may be acceptable with monitoring or timing changes — but check with your pharmacist first. Read the full details on this page and confirm with your pharmacist before combining them.
How serious is the Onion and Dapagliflozin interaction?
We rate it Moderate. This combination may require monitoring, a dose adjustment, or separating the times you take each one. Consult your pharmacist before using them together.

Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy

Still Have a Question About Dapagliflozin and Onion?

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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.