Drug & supplement interaction

Genistein Combined Polysaccharide + Alpelisib

Alpelisib brand name: Piqray.

No Known Interaction
Medically reviewed by · Updated July 2026 · Pair last verified Sep 27, 2026
The bottom line No known interaction

We found no known interaction between Genistein Combined Polysaccharide and Alpelisib in our sources. Absence of a documented interaction is not the same as proven safety, and does not guarantee one does not exist. Do not start, stop, or change a medication or supplement based on this page; confirm with your pharmacist or doctor first. Additionally, although there is no interaction, the label for Alpelisib states a food rule worth keeping to, and the two are separately associated with some of the same side effects, which would make a new symptom harder to attribute to one or the other.

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Interaction report

Genistein Combined Polysaccharide and Alpelisib

We checked these two against our interaction database. Here is what we found.

No Known Interaction Found

We did not find a documented interaction between Alpelisib and Genistein Combined Polysaccharide in our sources. This does not guarantee that the combination is completely free of risk — there is often limited research on supplements and herbal products, especially around drug interactions.

If you decide to take both, the practical routine is simple: add one new thing at a time and note the date you started it. If the combination is going to disagree with you, it usually shows in the first days to a couple of weeks — and a start date turns “I’ve been feeling off” into something a pharmacist can actually work with. Do not stop a prescribed medicine on your own.

Always talk with your pharmacist or doctor before making changes to your medications or supplements, particularly if you take several medications or have an ongoing health condition.

Genistein Combined Polysaccharide safety at a glance

Genistein Combined... overall Use caution Human safety data is limited, so use only with medical guidance.
Pregnancy Avoid Because it acts like estrogen and lacks safety data, avoid during pregnancy.
Breastfeeding Avoid Not enough safety information, so it is best avoided while breastfeeding.

Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

Still wondering about combining Alpelisib and Genistein Combined Polysaccharide? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
How we checked

Why No Interaction Is Listed for Alpelisib

Interactions in our licensed database are recorded against drug classes, not just single drug names. Alpelisib is filed under 3 classifications — cytochrome p450 2c9 (cyp2c9) inducers, cytochrome p450 3a4 (cyp3a4) substrates, oral drugs. Genistein Combined Polysaccharide has documented interactions with 2 drug classes — the most serious being caffeine (moderate) and cytochrome p450 2c9 (cyp2c9) substrates (minor) — and none of Alpelisib’s classifications are among them.

Classification data comes from our licensed Natural Medicines dataset. A medication can belong to classes beyond those recorded there, so this describes how the check was run — it is not a safety guarantee.

Keep it in perspective

Genistein Combined Polysaccharide Does Interact With Other Medications

Genistein Combined Polysaccharide has 29 moderate, 111 minor known drug interactions in our database — Alpelisib isn’t one of them. If you take anything else, check it against the full list below.

Moderate 29 Minor 111 No known interaction 2,690 (incl. Alpelisib)
Taking anything else?

Check Another of Your Medications Against Genistein Combined Polysaccharide

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

What to actually watch for

No Interaction Found — But Data Suggests Genistein Combined Polysaccharide and Alpelisib May Share Several of the Same Side Effects

This is not an interaction. Neither one changes how your body handles the other, and nothing here says they react together. What our sources do show is that each has separately been linked to the effects below — so taking both can make those effects more likely to turn up, and harder to pin on one or the other if they do.

  • Diarrhea / Nausea reported in 15.6% of FDA reports for Alpelisib Additional detail

    Genistein Combined Polysaccharide

    “In one case report, a patient with bladder cancer taking genistein combined polysaccharide 5 grams daily experienced mild nausea and diarrhea.”

    Genistein Combined Polysaccharide · Natural Medicines adverse-effect record, reported in bladder cancer.

    1 source cited
    1. 95165. Capodice JL, Cammack AS, McKiernan JM, Katz AE. Two case reports on the use of genistein combined polysaccharide (GCP) against bladder cancer recurrence. J Complement Integr Med 2011;8. PubMed

    Alpelisib

    Listed in the ADVERSE REACTIONS section of the FDA label for Alpelisib, and in voluntary FDA adverse-event reports. Read the label on DailyMed ›

Effects for Alpelisib come from the ADVERSE REACTIONS section of its FDA label; effects for Genistein Combined Polysaccharide come from the Natural Medicines adverse-effect record, quoted above. Where a percentage is shown, it is the share of 8,666 voluntary FDA FAERS reports for Alpelisib that mention that effect — a reporting proportion, not an incidence rate and not evidence the drug caused it. Wording is matched across sources by our own clinical vocabulary, so treat this as a prompt to pay attention, not a diagnosis.

How to take them

Some Alpelisib Products Have a Food Rule — Genistein Combined Polysaccharide Should Not Break It

At least one FDA label for a product containing Alpelisib says to take it with food. If you take Genistein Combined Polysaccharide on an empty stomach out of habit, keep them separate — and take Alpelisib with a meal where the label says to.

This may not be true of your version. Food instructions belong to the product, not the ingredient: two Alpelisib products can carry different directions, and extended-release forms often differ from immediate-release ones. The label we read is quoted below — check the directions on your own box or bottle, or ask your pharmacist, for how to take the exact product you were given.

2 DOSAGE AND ADMINISTRATION Recommended Dose: Pediatric patients (2 to less than 18 years of age): 50 mg taken orally once daily with food.

From the Dosage and Administration section of the FDA label we read for Alpelisib — where that label names a specific product, the instruction is that product's. Read the label on DailyMed ›

A food rule is not an interaction — it is about how much of the medicine you absorb. The directions that came with your own product, and your pharmacist, outrank anything on this page.

Overlapping uses

What Alpelisib Is Prescribed For, and What Genistein Combined Polysaccharide Has Been Studied For

These two come up together because they touch the same health topic — not because they do the same job. Alpelisib is a prescription medicine with approved uses on its FDA label. Genistein Combined Polysaccharide is a supplement: what follows is what researchers have looked at it for, and how strong that evidence is.

Alpelisib is prescribed for: Piqray is used with fulvestrant to treat adults with advanced or metastatic breast cancer that is hormone receptor (HR)-positive, HER2-negative and PIK3CA-mutated. It is for use after the cancer has progressed on or after an endocrine-based (hormone-blocking) treatment. An FDA-approved test must detect the mutation. Vijoice is used for adults and children 2 years and older with severe PROS who need systemic (whole-body) therapy.

Read the rest of what Alpelisib is prescribed for

This use has accelerated approval, which is based on response rate and duration of response. Continued approval may depend on confirmatory trials.

Genistein Combined Polysaccharide has been studied for:

  • Cancer studied, not established Genistein Combined Polysaccharide has been studied for this. Natural Medicines rates the evidence: Insufficient Reliable Evidence To Rate Read what the research shows

    Genistein Combined Polysaccharide for cancer

    Although there is interest in using oral genistein combined polysaccharide for the treatment of various forms of cancer, including breast cancer, bladder cancer, and prostate cancer, there is insufficient reliable information about the clinical effects of genistein combined polysaccharide for this purpose.

Effectiveness ratings and the research summaries above are the verbatim record from the Natural Medicines database, which grades evidence from “Effective” down to “Insufficient Reliable Evidence To Rate”. A rating below the top of that scale means researchers have looked at it — not that it works, and never that it can stand in for a prescribed medicine. Do not stop or replace Alpelisib on your own; if you are taking Genistein Combined Polysaccharide for the same health topic, tell your prescriber, especially if the medicine is being adjusted to a target.

Everything else you take

See Every Supplement That Interacts With Alpelisib

This page covers Genistein Combined Polysaccharide only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Alpelisib page lists 139 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Grapefruit (major), St. John's Wort (major), Acacia Rigidula (moderate) and Adrafinil (moderate).

By severity: 3 major · 96 moderate · 40 minor.

From our pharmacist’s overview on the Alpelisib page

“Alpelisib (Piqray) treats PIK3CA-mutated breast cancer, and a drug doing that job leaves little room for supplements that shift its blood level. Yet that is what most of this list does: 121 of the 139 ingredients on file can raise or lower alpelisib through CYP3A4, the liver enzyme that clears it.”

Reviewed by 2 · Jul 18, 2026

Open the Alpelisib interaction page

How much people look this up

Where Genistein Combined Polysaccharide and Alpelisib 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 Genistein Combined Polysaccharide
Top half

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

29 days ago today
Medication Alpelisib
Steady interest

#1,526 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.

Where does our data come from?
  • Source: the Natural Medicines (TRC Healthcare) clinical database — the evidence-graded professional reference for herb & supplement interactions.
  • Citation library: 103,510 references behind our interaction content, 65,311 of them resolved to verified PubMed/DOI sources. See every Genistein Combined Polysaccharide reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 27, 2026. The Genistein Combined Polysaccharide and Alpelisib records this page draws on were last updated July 10, 2026.
  • What “no known interaction” means: no documented interaction in the sources above — not a guarantee of safety. Supplements are studied far less than prescription drugs, so we say exactly what the evidence supports, and nothing more.
Data structure & sourcing designed and verified by .
Supplement

About Genistein Combined Polysaccharide

What is Genistein Combined Polysaccharide?

  • Prostate cancer support
  • Bladder cancer support
  • Breast cancer support
  • Hormone-related cancers
  • Immune support

Genistein Combined Polysaccharide (GCP) is a soy-and-mushroom supplement studied mostly for hormone-related cancers like prostate cancer, but solid human evidence is still limited. It should never replace standard cancer treatment, and you should talk with your oncologist and pharmacist before using it, especially if you have a hormone-sensitive condition.

Soybean-derived genistein combined with polysaccharides from basidiomycete mushrooms · Capsules, tablets

An interaction check asks whether these two react with each other — it does not ask whether Genistein Combined Polysaccharide is a good idea for someone in your situation. Here is what our Genistein Combined Polysaccharide record says about it on its own.

Genistein Combined Polysaccharide: dosing

There is no officially established or standardized dose for Genistein Combined Polysaccharide. Different products contain different amounts and formulations, so the right amount is not clear.If you choose to use GCP, follow the directions on the specific product label and do not exceed them.

From our Genistein Combined Polysaccharide monograph — the full record covers uses, side effects and every documented interaction.

Read the full Genistein Combined Polysaccharide monograph & all interactions
Medication

About Alpelisib

What Is Alpelisib Used For?

Brand name: Piqray

Piqray is used with fulvestrant to treat adults with advanced or metastatic breast cancer that is hormone receptor (HR)-positive, HER2-negative and PIK3CA-mutated. It is for use after the cancer has progressed on or after an endocrine-based (hormone-blocking) treatment. An FDA-approved test must detect the mutation.

Vijoice is used for adults and children 2 years and older with severe PROS who need systemic (whole-body) therapy. This use has accelerated approval, which is based on response rate and duration of response. Continued approval may depend on confirmatory trials.

Most-Reported Side Effects for Alpelisib

From FAERS, the FDA’s public side-effect reporting system (8,666 reports, all brands). Reports are voluntary and are not proof the drug caused the effect.

Hyperglycaemia 1,509 reports
Rash 1,391 reports
Diarrhea 1,356 reports
Blood glucose increased 1,130 reports
Nausea 861 reports
See full Alpelisib drug information
Keep checking

Other Drugs & Genistein Combined Polysaccharide

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

0Major
29Moderate
111Minor
2,689No known interaction
29 Moderate 111 Minor 2,689 No interaction
Moderate

29 interactions

Minor

111 interactions

Showing 60 of 111 minor interactions — see all 111 on the Genistein Combined Polysaccharide page.

No interaction 2,689 drugs checked — show the list

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

Showing the 60 most looked-up of 2,689 medications checked with no known interaction — see the full Genistein Combined Polysaccharide list.

See the full Genistein Combined Polysaccharide interactions page
See every supplement checked against Alpelisib, ranked by severity
Evidence & sources

Genistein Combined Polysaccharide References

The 2 references that drive our Genistein Combined Polysaccharide monograph and interaction data, from the evidence-graded Natural Medicines (TRC Healthcare) database. Citations with a link open the study on PubMed or the publisher’s site.

  1. Chen, Y., Xiao, C. Q., He, Y. J., Chen, B. L., Wang, G., Zhou, G., Zhang, W., Tan, Z. R., Cao, S., Wang, L. P., and Zhou, H. H. Genistein alters caffeine exposure in healthy female volunteers. Eur.J Clin.Pharmacol. 2011;67(4):347-353. PubMed
  2. Capodice JL, Cammack AS, McKiernan JM, Katz AE. Two case reports on the use of genistein combined polysaccharide (GCP) against bladder cancer recurrence. J Complement Integr Med 2011;8. PubMed

Medication overviews come from MedlinePlus (NIH); supplement label data from the NIH Dietary Supplement Label Database. Content is written and reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

Pharmacist Counseling Corner

Taking Genistein Combined Polysaccharide and Alpelisib Together: Common Questions

Is it safe to take Genistein Combined Polysaccharide with Alpelisib?
We do not list a known interaction between Genistein Combined Polysaccharide and Alpelisib. That does not guarantee the combination is risk-free, so confirm with your pharmacist or doctor — especially if you take other medications or have a health condition.
Do Genistein Combined Polysaccharide and Alpelisib have any of the same side effects?
Yes — our sources link each of them separately to 2 of the same effects. That is not an interaction: neither changes how your body handles the other. It does mean that if one of those effects turns up, it can be harder to tell which one is behind it. They are listed on this page with the source behind each.
Should I take Genistein Combined Polysaccharide and Alpelisib at the same time of day?
At least one FDA label for a product containing Alpelisib says to take it with food. If you take Genistein Combined Polysaccharide on an empty stomach out of habit, keep them separate and take Alpelisib with a meal where the label says to. Food instructions belong to the product rather than the ingredient — two Alpelisib products can differ — so check the directions on your own box. This is about absorption, not an interaction.
Are Genistein Combined Polysaccharide and Alpelisib used for the same thing?
They overlap in purpose, which usually means the real question is whether you need both rather than whether they are safe together. This page lists the shared uses and how strong the evidence is for Genistein Combined Polysaccharide in each. That is a conversation for your prescriber, especially if Alpelisib is being adjusted to a target.
How was the Genistein Combined Polysaccharide and Alpelisib combination checked?
Interactions in our licensed database are recorded against drug classes. Alpelisib is filed under 3 classifications, and Genistein Combined Polysaccharide has documented interactions with 2 drug classes — none of Alpelisib's classifications are among them. A medication can belong to classes beyond those recorded in our dataset, so this describes how the check was run rather than guaranteeing safety.
Does Genistein Combined Polysaccharide interact with any other medications?
Yes. Genistein Combined Polysaccharide has 140 documented drug interactions in our database — Alpelisib is simply not one of them. If you take anything else, it is worth checking each one; they are all listed on this page.
Does Alpelisib interact with any supplements?
Yes. Alpelisib has documented interactions with 139 supplements in our database — Genistein Combined Polysaccharide is not one of them. The Alpelisib interaction page linked on this page lists every one, ranked by severity.

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

Where next

Keep Exploring

Genistein Combined Polysaccharide monograph Uses, safety profile, and every drug interaction in one place Alpelisib drug information The full plain-English guide to this medication Alpelisib supplement interactions Every supplement checked against Alpelisib, 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 References The 2 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Alpelisib and Genistein Combined Polysaccharide?

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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.