Medication interaction hub

What Supplements Interact with Castor Oil (OTC drug)?

Castor Oil (OTC drug) brand name: Purge. Every interaction below applies to the brands too.

46 Interactions 3 Major 34 Moderate 9 Minor
Curated & coded by · Clinical Pharmacist · Updated October 7, 2026

Drug–supplement interaction data sourced from Natural Medicines Pro, the licensed clinical database from TRC Healthcare / Therapeutic Research, with additional analysis by the HelloPharmacist Pharmacist Team. Our sources · Editorial policy

What is this page for?

One answer, for one medication: what supplements and herbal products interact with Castor Oil (OTC drug)? Every vitamin, herb, and supplement ingredient we’ve checked against it is on this page, ranked by severity, each linking to the full report for that exact pair.

This page covers supplement interactions only — to check Castor Oil (OTC drug) against your other medications, use the drug–drug interaction checker. Educational information from our licensed clinical databases, not medical advice. Our editorial policy

HelloPharmacist Bottom Line
Our Pharmacist Explains
What is this? The interaction data in the HelloPharmacist supplement database is licensed from Natural Medicines Pro by TRC Healthcare (Therapeutic Research). HelloPharmacist pharmacists often add our own analysis and context on top of that licensed data — such as this Bottom Line summary and the notes on individual interaction pages — and any such commentary is noted as ours.

Castor oil, the classic over-the-counter purgative, deserves real care around supplements. Most of what's flagged against it are herbal laxatives in their own right, and doubling up can drain enough fluid and potassium to cause genuine harm, in some cases making plants that contain heart-active compounds, oleander chief among them, far more toxic. The rest of the list concerns absorption, fibers and charcoals that can keep oral medicines from absorbing properly.

The three major entries deserve attention first. Jalap stacks a second strong laxative on top of castor oil, oleander grows more dangerous as potassium falls, and activated charcoal can soak up many medicines taken by mouth, so keep it well separated from any oral dose. Those three sit atop 34 moderate and 9 minor interactions, 46 ingredients altogether, and the moderates mostly repeat the same fluid and potassium story on a smaller scale.

— , Clinical Pharmacist · July 18, 2026

Major 3 Moderate 34 Minor 9 No known interaction 1,406

This box checks one ingredient at a time (like turmeric or magnesium). Taking a supplement product with a whole label of ingredients? Search the product instead — we check every ingredient on it ↓

Top Ingredient Interactions

Castor Oil (OTC drug): Top Interactions at a Glance

The most significant Castor Oil (OTC drug) supplement & herbal interactions, colored by severity. Tap any ingredient to open the full report for that pair.

Showing the 12 highest-ranked of 46 interacting ingredients — plus 1,406 more checked with no known interaction. See the complete ranked list.

Start here

The Major Interactions to Know About

The most clinically significant Castor Oil (OTC drug) + supplement combinations in our database, best-documented first. Open any card for the full report.

Major Likelihood Probable Activated Charcoal + Castor Oil (OTC drug)i

Activated charcoal reduces systemic exposure to many drugs, including those that undergo enterohepatic recirculation, regardless of the route of administration.

Read the full interaction Major Likelihood Probable Jalap + Castor Oil (OTC drug)i

Jalap has stimulant laxative effects.

Read the full interaction Major Likelihood Probable Oleander + Castor Oil (OTC drug)i

Theoretically, stimulant laxatives may increase the risk of oleander toxicity.

Read the full interaction
The complete list

Every Supplement Checked Against Castor Oil (OTC drug)

All 1,452 ingredients in our database, ranked by severity — 46 with a Castor Oil (OTC drug) interaction on file and 1,406 with none found. Filter by severity or search any ingredient; hover the for what each ingredient is.

Looking for an interaction with a specific supplement product? Search products instead ↓

Straight answers

Can You Take It With Castor Oil (OTC drug)?

One-line answers, one card per combination — scroll through today’s 20 and tap any card for the full report. A different set rotates in daily until every combination has had its turn.

Can you take Fo-ti with Castor Oil (OTC drug)?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, fo-ti, particularly raw fo-ti root, might increase the risk of fluid and electrolyte depletion when taken with stimulant laxa...

Full Fo-ti + Castor Oil (OTC drug) answer

Can you take Foxglove with Castor Oil (OTC drug)?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, overuse of stimulant laxatives increases the risk of cardiac glycoside toxicity.

Full Foxglove + Castor Oil (OTC drug) answer

Can you take Gamboge with Castor Oil (OTC drug)?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Concomitant use of gamboge with stimulant laxatives may increase the risk of fluid and electrolyte loss.

Full Gamboge + Castor Oil (OTC drug) answer

Can you take Gardenia with Castor Oil (OTC drug)?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, gardenia might increase the effects and adverse effects of stimulant laxatives.

Full Gardenia + Castor Oil (OTC drug) answer

Can you take Gossypol with Castor Oil (OTC drug)?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, gossypol might increase the risk of additive potassium depletion and hypokalemia when taken with stimulant laxatives.

Full Gossypol + Castor Oil (OTC drug) answer

Can you take Guar Gum with Castor Oil (OTC drug)?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Guar gum might reduce the absorption of some oral drugs, potentially decreasing their effectiveness.

Full Guar Gum + Castor Oil (OTC drug) answer

Can you take Gum Arabic with Castor Oil (OTC drug)?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, gum arabic can alter the absorption of oral drugs due to its fiber content.

Full Gum Arabic + Castor Oil (OTC drug) answer

Can you take Hedge Mustard with Castor Oil (OTC drug)?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, taking hedge mustard with stimulant laxatives might increase the risk of cardiac glycoside toxicity.

Full Hedge Mustard + Castor Oil (OTC drug) answer

Can you take Lily-of-the-valley with Castor Oil (OTC drug)?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, using lily-of-the-valley with stimulant laxatives can increase the risk of cardiac glycoside toxicity.

Full Lily-of-the-valley + Castor Oil (OTC drug) answer

Can you take Manna with Castor Oil (OTC drug)?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, manna might increase the risk for fluid and electrolyte loss when taken with stimulant laxatives.

Full Manna + Castor Oil (OTC drug) answer

Can you take Pheasant's Eye with Castor Oil (OTC drug)?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, taking pheasant's eye with stimulant laxatives might increase the risk of cardiac glycoside toxicity.

Full Pheasant's Eye + Castor Oil (OTC drug) answer

Can you take Rhubarb with Castor Oil (OTC drug)?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, rhubarb might increase the risk for fluid and electrolyte loss when taken with other stimulant laxatives.

Full Rhubarb + Castor Oil (OTC drug) answer

Can you take Senna with Castor Oil (OTC drug)?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, senna might increase the risk for fluid and electrolyte loss when taken with other stimulant laxatives.

Full Senna + Castor Oil (OTC drug) answer

Can you take Slippery Elm with Castor Oil (OTC drug)?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, slippery elm may slow the absorption and reduce serum levels of oral drugs.

Full Slippery Elm + Castor Oil (OTC drug) answer

Can you take Sodium Bicarbonate with Castor Oil (OTC drug)?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, sodium bicarbonate may increase the risk of hypokalemia in patients taking stimulant laxatives.

Full Sodium Bicarbonate + Castor Oil (OTC drug) answer

Can you take Squill with Castor Oil (OTC drug)?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Squill contains cardiac glycosides.

Full Squill + Castor Oil (OTC drug) answer

Can you take Star Of Bethlehem with Castor Oil (OTC drug)?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, excessive use of stimulant laxatives with star of Bethlehem might increase the risk of toxicity.

Full Star Of Bethlehem + Castor Oil (OTC drug) answer

Can you take Strophanthus with Castor Oil (OTC drug)?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Overuse or misuse of laxatives may cause electrolyte depletion and increase risk of strophanthus toxicity.

Full Strophanthus + Castor Oil (OTC drug) answer

Can you take Swamp Milkweed with Castor Oil (OTC drug)?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, excessive use of stimulant laxatives with swamp milkweed might increase the risk of toxicity.

Full Swamp Milkweed + Castor Oil (OTC drug) answer

Can you take Tragacanth with Castor Oil (OTC drug)?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, tragacanth might alter absorption of oral drugs.

Full Tragacanth + Castor Oil (OTC drug) answer
Read the list like a pharmacist

What Severity, Likelihood & Evidence Mean

Severity — How Serious It Can Be

  • Major. Clinically significant; generally best avoided, or used only under direct professional supervision.
  • Moderate. May need monitoring, a dose adjustment, or separating the times you take each one.
  • Minor. Generally not clinically significant, but still worth noting and mentioning to your pharmacist.
  • No known interaction. Checked against our sources with nothing documented — not the same as proven safety.

Likelihood — How Well It’s Documented

  • Likely. Well-controlled human studies have demonstrated the likely existence of this interaction
  • Probable. 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.
  • Possible. 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
  • Unlikely. Interaction has been demonstrated in animal or in lab research but has been shown not to occur in humans.

Where This Data Comes From

  • Interaction records are evidence-graded and sourced from the Natural Medicines database (TRC Healthcare), the same reference used by pharmacists and hospitals.
  • Each entry links to a full report with the clinical detail, likelihood, evidence level, and citations for that exact combination.
  • Content is reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

How Does Our Interaction Checker Work?

Behind every verdict on this page is a category system. Our source database doesn’t document supplement interactions drug-by-drug — it documents them against groups of medications that behave the same way (for example, “drugs processed by the CYP3A4 liver enzyme” or “blood-thinning medications”).

So the check works in three steps: (1) Castor Oil (OTC drug) is classified into the pharmacology categories it belongs to, (2) every supplement interaction documented against any of those categories is inherited by Castor Oil (OTC drug), and (3) each ingredient keeps its own severity, likelihood, and evidence grades from the underlying record. That’s why one supplement can carry several records for one drug — it may interact through more than one category.

Castor Oil (OTC drug) sits in 2 interaction categories. Open any one to see what the group means:

Stimulant Laxatives 29 ingredients

A pharmacology grouping from our source database: medications in this group share a property that certain supplements are known to interact with, so an interaction documented for the group applies to every drug in it.

29 of the supplement ingredients on this page reach Castor Oil (OTC drug) through this category.

Oral Drugs 17 ingredients

A pharmacology grouping from our source database: medications in this group share a property that certain supplements are known to interact with, so an interaction documented for the group applies to every drug in it.

17 of the supplement ingredients on this page reach Castor Oil (OTC drug) through this category.

Check a real product

Take a Supplement Product? Check the Whole Bottle Against Castor Oil (OTC drug)

Most supplements are combination products — and the interaction may come from an ingredient you didn’t buy it for. Search any product below (or scan its label) and we’ll check every ingredient on it against Castor Oil (OTC drug).

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Products that contain Castor Oil (OTC drug)-interacting ingredients

Real supplements from the NIH label database that contain the top interacting ingredients on this page — each one is worth a full label check before combining with Castor Oil (OTC drug).

Nutra-BBS by NutraMedix contains Jalap Enula by NutraMedix contains Jalap Enula by NutraMedix contains Jalap Enula by NutraMedix contains Jalap
Pharmacist Counseling Corner

Castor Oil (OTC drug) & Supplements: Common Questions

What supplements interact with Castor Oil (OTC drug)?
Our database currently documents 46 ingredients with a known Castor Oil (OTC drug) interaction (3 major, 34 moderate, 9 minor). The practical move: scan the major group first, then look up the exact supplements you take rather than reading all 46. The highest-ranked right now: Activated Charcoal, Jalap, Oleander.
Which Castor Oil (OTC drug) supplement interactions are the most serious?
The 3 major-rated combinations — led by Activated Charcoal, Jalap and Oleander — deserve real caution: these are the ones generally best avoided, or used only with your prescriber watching. If you take any of them today, don't panic and don't stop anything abruptly — call your pharmacist first. Jump to the ranked list.
Can I take vitamins or supplements while on Castor Oil (OTC drug)?
Plenty of supplements coexist fine with Castor Oil (OTC drug); a shorter list does not. Rather than memorizing it, check the specific ingredients on your labels — the ranked list above covers every one we've checked, and multi-ingredient products can be checked label-by-label with our scanner. Try the label scanner or the interaction checker.
Do brands like Purge have the same supplement interactions as Castor Oil (OTC drug)?
Yes — Purge all contain Castor Oil (OTC drug), so everything on this page applies to them equally. Interactions belong to the active drug, never to the brand on the box; the same is true of generics.
Where do these interaction ratings come from?
Every rating comes from the Natural Medicines database — the same evidence-graded reference pharmacists and hospitals use — and each interaction carries three separate grades: severity (how bad it can be), likelihood (how well it's documented in studies and case reports), and an evidence level. Our pharmacists review the content; we never let an AI decide an interaction. See how to read the ratings and our editorial policy.
What about Castor Oil (OTC drug) and my other medications?
This page covers Castor Oil (OTC drug) against supplements and herbal ingredients. Checking Castor Oil (OTC drug) against your other prescription or OTC medications is a different tool — our drug interaction checker covers that side. Head to the drug–drug interaction checker.

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

Where next

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Sourcing

Where This Data Comes From — and Why You Can Trust It

🧪 Licensed clinical database

Every interaction verdict on this page comes from Natural Medicines Pro (TRC Healthcare / Therapeutic Research) — the same evidence-graded reference used by pharmacists and hospitals. We license this data directly; we do not scrape it, and no AI invents an interaction.

🧑‍⚕️ Pharmacist review

This page is curated and coded by , Clinical Pharmacist, with additional analysis by the HelloPharmacist Pharmacist Team. Editorial commentary is ours; the licensed interaction records are shown as sourced.

🔄 Kept current

Our interaction database refreshes on a weekly cycle, and this page re-checks the live database every time it’s rebuilt — what you see reflects the database as of October 7, 2026.

🔍 Full transparency

How every dataset on this site is sourced, licensed, and updated is documented publicly: our data sources · editorial policy · how we use AI.

Educational information, not medical advice. An interaction being on file does not mean it will happen to you — and absence of one is not proof of safety. Never start or stop a medication or supplement without talking to your pharmacist or doctor.