Drug & supplement interaction

Prickly Pear Cactus + Insulin

Insulin brand name: NovoRapid Insulin.

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

Prickly Pear Cactus has a moderate interaction with Insulin. Combining prickly pear cactus with antidiabetes drugs might increase the risk of hypoglycemia.

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

Prickly Pear Cactus and Insulin

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

Moderate

ANTIDIABETES DRUGS

Why this applies to Insulin

Insulin falls under ANTIDIABETES DRUGS — the group Prickly Pear Cactus interacts with.

Combining prickly pear cactus with antidiabetes drugs might increase the risk of hypoglycemia.
Case reports show that combining prickly pear cactus with antidiabetes drugs such as chlorpropamide, glyburide, glipizide, and metformin can increase the risk of hypoglycemia in patients with type 2 diabetes. Advise patients to monitor glucose levels closely. Dose adjustments may be necessary.
Severity Moderate Likelihood Probable Evidence D

Interaction 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..

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

Here's the simple version: prickly pear cactus may gently lower your blood sugar on its own, mostly because of its soluble fiber that slows how fast sugar gets absorbed after meals. NovoRapid (insulin aspart) already lowers your blood sugar directly, so stacking the two could push your glucose lower than you intend. That raises your chance of a low (hypoglycemia), which can show up as shakiness, sweating, a racing heart, confusion, or feeling lightheaded.

To be fair, the evidence here is mostly anecdotal case reports, so it's not a strong or guaranteed effect, and small food amounts are far less likely to matter than concentrated supplement doses. Still, since insulin works fast, I'd check your sugars more often if you add it, and talk with your doctor or pharmacist before starting. Don't change your insulin dose on your own.

Contact Dr. Brian directly if you have additional questions on this interaction
References
  1. Meckes-Lozyoa M, Roman-Ramos R. Opuntia streptacantha; a coadjutor in the treatment of diabetes mellitus. Am J Chin Med 1986;14:116-8.
  2. Bush TM, Rayburn KS, Holloway SW, et al. Adverse interactions between herbal and dietary substances and prescription medications: a clinical survey. Altern Ther Health Med 2007;13:30-5.
  3. Sobieraj DM, Freyer CW. Probable hypoglycemic adverse drug reaction associated with prickly pear cactus, glipizide, and metformin in a patient with type 2 diabetes mellitus. Ann Pharmacother 2010;44:1334-7. PubMed
  4. Meckes-Lozyoa, M. and Roman-Ramos, R. Opuntia streptacantha: a coadjutor in the treatment of diabetes mellitus. Am J Chin Med 1986;14(3-4):116-118.
  5. Onakpoya IJ, O'Sullivan J, Heneghan CJ. The effect of cactus pear (Opuntia ficus-indica) on body weight and cardiovascular risk factors: a systematic review and meta-analysis of randomized clinical trials. Nutrition. 2015;31(5):640-6. 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

Prickly Pear Cactus Also Interacts With Other Medications

Prickly Pear Cactus has 85 moderate known drug interactions in our database — the Insulin one above is one of them. If you take anything else, check it against the full list below.

Moderate 85 No known interaction 2,745 (incl. Insulin)
Taking anything else?

Check Another of Your Medications Against Prickly Pear Cactus

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

Everything else you take

See Every Supplement That Interacts With Insulin

This page covers Prickly Pear Cactus only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Insulin page lists 242 supplements it has a documented interaction with, worst first, each one explained.

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

By severity: 2 major · 211 moderate · 29 minor.

From our pharmacist’s overview on the Insulin page

“Someone injecting insulin (NovoRapid) is often the same person browsing supplements sold for blood sugar support, which is exactly why this list warrants genuine caution. Nearly all 242 entries push glucose one way or the other, most often further down, stacking with insulin and raising the risk of hypoglycemia, meaning dangerously low…”

Reviewed by 2 · Jul 18, 2026

Open the Insulin interaction page

One more smart check

Taking Prickly Pear Cactus as Part of a Dietary Supplement Product? Check It for Interactions

We hold 432 real supplement products containing Prickly Pear Cactus, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Prickly Pear Cactus. Your product may carry other ingredients that interact with Insulin too, on top of Prickly Pear Cactus — 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 Prickly Pear Cactus and Insulin 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 Prickly Pear Cactus
Top half

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

29 days ago today
Medication Insulin
Top half

#927 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 Prickly Pear Cactus

What is Prickly Pear Cactus?

  • Blood sugar control
  • High cholesterol
  • Hangover symptoms
  • Digestive health
  • Antioxidant support

Prickly pear cactus is a desert plant whose pads and fruit are eaten as food and taken as a supplement, mainly for blood sugar, cholesterol, and hangover symptoms. Some small studies suggest modest benefits, but the evidence is limited and not strong enough to rely on it as a treatment. Talk with your pharmacist or doctor before using it, especially if you take medication for diabetes.

Read the full Prickly Pear Cactus monograph & all interactions
Keep checking

Other Drugs & Prickly Pear Cactus

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

0Major
85Moderate
0Minor
2,744No known interaction
85 Moderate 2,744 No interaction
Moderate

85 interactions

Showing 60 of 85 moderate interactions — see all 85 on the Prickly Pear Cactus page.

No interaction 2,744 drugs checked — show the list

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

Showing the 60 most looked-up of 2,744 medications checked with no known interaction — see the full Prickly Pear Cactus list.

See the full Prickly Pear Cactus interactions page
See every supplement checked against Insulin, 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
Prickly Pear Cactus monograph › Uses, safety, and every drug interaction in one place Insulin supplement interactions › Every supplement checked against Insulin, ranked by severity 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 Prickly Pear Cactus and Insulin Together: Common Questions

Can you take Prickly Pear Cactus with Insulin?
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 Prickly Pear Cactus and Insulin 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 Insulin and Prickly Pear Cactus?

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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.