Medication interaction hub

What Supplements Interact with Phenolphthalein?

Phenolphthalein brand names: Modane, Evac-Q-Tab, Modane Mild. Every interaction below applies to the brands too.

46 Interactions 3 Major 34 Moderate 9 Minor
Curated & coded by · Clinical Pharmacist · Updated September 22, 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 Phenolphthalein? 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 Phenolphthalein 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.

Phenolphthalein is a stimulant laxative itself, and that is the heart of the problem with these combinations. Most of the herbs on file, jalap being one, act the same way, so pairing them can drain fluid and potassium quickly. Falling potassium then sets up the scariest scenario here, because plants carrying heart-acting glycosides, oleander in particular, become far more toxic once potassium runs low. This is a list to approach with real vigilance, not casual curiosity.

A second, smaller group interferes with how pills are absorbed. Activated charcoal binds many medicines in the gut and can blunt their effect, and thick fibers can do something similar, so keep them well separated from anything taken by mouth, and ask a pharmacist how far apart makes sense for you. Forty-six ingredients appear below in all; 34 rate moderate and 9 minor, but the three major-rated entries are where to begin reading.

— , 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

Phenolphthalein: Top Interactions at a Glance

The most significant Phenolphthalein 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 Phenolphthalein + supplement combinations in our database, best-documented first. Open any card for the full report.

Major Likelihood Probable Activated Charcoal + Phenolphthaleini

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 + Phenolphthaleini

Jalap has stimulant laxative effects.

Read the full interaction Major Likelihood Probable Oleander + Phenolphthaleini

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

Read the full interaction
The complete list

Every Supplement Checked Against Phenolphthalein

All 1,452 ingredients in our database, ranked by severity — 46 with a Phenolphthalein 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 Phenolphthalein?

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 Wahoo with Phenolphthalein?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, use of stimulant laxatives with wahoo might have additive laxative effects, and can increase the risk of cardiac glycoside to...

Full Wahoo + Phenolphthalein answer

Can you take Carob with Phenolphthalein?

Minor Usually — this is a minor-rated interaction, generally not clinically significant but worth mentioning to your pharmacist. Theoretically, carob might also impair the absorption of oral drugs.

Full Carob + Phenolphthalein answer

Can you take Manna with Phenolphthalein?

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 + Phenolphthalein answer

Can you take Gamboge with Phenolphthalein?

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 + Phenolphthalein answer

Can you take Gardenia with Phenolphthalein?

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 + Phenolphthalein answer

Can you take Gossypol with Phenolphthalein?

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 + Phenolphthalein answer

Can you take Guar Gum with Phenolphthalein?

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 + Phenolphthalein answer

Can you take Gum Arabic with Phenolphthalein?

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 + Phenolphthalein answer

Can you take Hedge Mustard with Phenolphthalein?

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 + Phenolphthalein answer

Can you take Lily-of-the-valley with Phenolphthalein?

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 + Phenolphthalein answer

Can you take Pheasant's Eye with Phenolphthalein?

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 + Phenolphthalein answer

Can you take Rhubarb with Phenolphthalein?

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 + Phenolphthalein answer

Can you take Senna with Phenolphthalein?

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 + Phenolphthalein answer

Can you take Slippery Elm with Phenolphthalein?

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 + Phenolphthalein answer

Can you take Sodium Bicarbonate with Phenolphthalein?

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 + Phenolphthalein answer

Can you take Squill with Phenolphthalein?

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

Full Squill + Phenolphthalein answer

Can you take Star Of Bethlehem with Phenolphthalein?

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 + Phenolphthalein answer

Can you take Strophanthus with Phenolphthalein?

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 + Phenolphthalein answer

Can you take Swamp Milkweed with Phenolphthalein?

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 + Phenolphthalein answer

Can you take Tragacanth with Phenolphthalein?

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 + Phenolphthalein 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) Phenolphthalein is classified into the pharmacology categories it belongs to, (2) every supplement interaction documented against any of those categories is inherited by Phenolphthalein, 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.

Phenolphthalein 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 Phenolphthalein 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 Phenolphthalein through this category.

Related: does Phenolphthalein deplete any nutrients?

Phenolphthalein has 9 reported nutrient associations in the research literature — see the Phenolphthalein nutrient depletion report.

Check a real product

Take a Supplement Product? Check the Whole Bottle Against Phenolphthalein

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 Phenolphthalein.

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Products that contain Phenolphthalein-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 Phenolphthalein.

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

Phenolphthalein & Supplements: Common Questions

What supplements interact with Phenolphthalein?
In our interaction database, 46 supplement and herbal ingredients have an interaction with Phenolphthalein on file — 3 rated major, 34 moderate, and 9 minor. That number sounds scarier than it is: severity matters far more than the count, which is why the list on this page is ranked instead of alphabetical. Start at the top. The highest-ranked right now: Activated Charcoal, Jalap, Oleander.
Which Phenolphthalein 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 Phenolphthalein?
That depends entirely on which supplement. The honest answer for Phenolphthalein is in the ranked list above — and if what you take is a combination product with a dozen ingredients, don't check them one by one: photograph the label with our scanner and we'll check the whole thing at once. Try the label scanner or the interaction checker.
Do brands like Modane have the same supplement interactions as Phenolphthalein?
Yes — Modane, Evac-Q-Tab, Modane Mild all contain Phenolphthalein, 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.
Does Phenolphthalein deplete any vitamins or nutrients?
It might — Phenolphthalein has 9 reported nutrient-depletion associations in the research literature, which is a different question from interactions: instead of a supplement changing the drug, the drug may lower a nutrient over time. See the Phenolphthalein nutrient depletion report for the specifics and what to discuss with your pharmacist.
What about Phenolphthalein and my other medications?
This page covers Phenolphthalein against supplements and herbal ingredients. Checking Phenolphthalein 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

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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 September 22, 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.