Drug & supplement interaction

Soybean Oil + Thiotepa

Thiotepa brand names: Thioplex, Tepadina.

No Known Interaction
Medically reviewed by · Updated July 2026 · Pair last verified Sep 20, 2026
The bottom line No known interaction

We found no known interaction between Soybean Oil and Thiotepa 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 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

Soybean Oil and Thiotepa

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 Thiotepa and Soybean Oil 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.

Worth understanding: our licensed dataset holds no drug-interaction record for Soybean Oil at all — not against Thiotepa, and not against any other medication we track. This verdict therefore rests on the absence of any recorded data, not on research that looked at this combination and found nothing. We cannot rule an interaction out.

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.

Soybean Oil safety at a glance

Soybean Oil overall Generally safe Soybean oil is widely consumed as food and is generally safe for most people in normal dietary amounts.
Pregnancy Likely Safe When used orally in amounts commonly found in foods. There is insufficient reliable information available about soybean oil when used orally in medicinal amount... Read the full pregnancy detail
Breastfeeding Likely Safe When used orally in amounts commonly found in foods. There is insufficient reliable information available about soybean oil when used orally in medicinal amount... Read the full breastfeeding detail

Pregnancy & breastfeeding ratings are from Natural Medicines (Therapeutic Research Center) — the full detail is in the Special populations card below. Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

Still wondering about combining Thiotepa and Soybean Oil? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
What to actually watch for

No Interaction Found — But Data Suggests Soybean Oil and Thiotepa 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. 2 of them are worth acting on rather than waiting out — marked below.

  • A severe allergic reaction / An allergic reaction Worth acting on Additional detail

    Soybean Oil

    “Soybean oil can cause an allergic reaction in individuals allergic to the Fabaceae/Leguminosea family. Members of this family include peanuts, soybeans, and others. The inclusion of soybean oil as an inactive ingredient in a generic formulation of the drug omeprazole caused anaphylaxis in two females with soybean allergies.”

    Soybean Oil · Natural Medicines adverse-effect record, reported in allergic rhinitis (hay fever).

    3 sources cited
    1. 4079. Eigenmann PA, Burks AW, Bannon GA, et al. Identification of unique peanut and soy allergens in sera adsorbed with cross-reacting antibodies. J Allergy Clin Immunol 1996;98:969-78. PubMed
    2. 4080. Bardare M, Magnolfi C, Zani G. Soy sensitivity: personal observation on 71 children with food intolerance. Allerg Immunol (Paris) 1988;20:63-6.
    3. 93683. Duenas-Laita A, Pineda F, Armentia A. Hypersensitivity to generic drugs with soybean oil. N Engl J Med 2009;361(13):1317-8. PubMed

    Thiotepa

    Listed in the ADVERSE REACTIONS section of the FDA label for Thiotepa. Read the label on DailyMed ›

Effects for Thiotepa come from the ADVERSE REACTIONS section of its FDA label; effects for Soybean Oil come from the Natural Medicines adverse-effect record, quoted above. Wording is matched across sources by our own clinical vocabulary, so treat this as a prompt to pay attention, not a diagnosis.

Special populations

Soybean Oil in Pregnancy & Breastfeeding

Pregnancy Likely Safe

When used orally in amounts commonly found in foods. There is insufficient reliable information available about soybean oil when used orally in medicinal amounts; avoid using in amounts greater than those typically found in foods.

Lactation Likely Safe

When used orally in amounts commonly found in foods. There is insufficient reliable information available about soybean oil when used orally in medicinal amounts; avoid using in amounts greater than those typically found in foods.

DISCLAIMER: This tool is intended for informational purposes only, and should not be interpreted as specific medical advice. Patients should consult with a qualified healthcare provider before making decisions about therapies and/or health conditions.© 2026 Therapeutic Research Center

Everything else you take

See Every Supplement That Interacts With Thiotepa

This page covers Soybean Oil only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Thiotepa page lists 146 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 Acerola (moderate).

By severity: 3 major · 102 moderate · 41 minor.

From our pharmacist’s overview on the Thiotepa page

“Thiotepa (Thioplex, Tepadina) is chemotherapy, given for several cancers and to prepare patients for stem cell transplant, so its 146 supplement interactions make up a list to respect rather than skim. Three carry a major rating: grapefruit, St.”

Reviewed by 2 · Jul 18, 2026

Open the Thiotepa interaction page

One more smart check

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

We hold 48 real supplement products containing Soybean Oil, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Soybean Oil. Even though Soybean Oil itself has no known interaction with Thiotepa, another ingredient on your label might. Find your product and we’ll check every ingredient on its label:

How much people look this up

Where Soybean Oil and Thiotepa 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 Soybean Oil
Steady interest

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

29 days ago today
Medication Thiotepa
Steady interest

#1,417 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 Soybean Oil reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 20, 2026. The Soybean Oil and Thiotepa records this page draws on were last updated July 11, 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 Soybean Oil

What is Soybean Oil?

  • Source of dietary fat and calories
  • Heart and cholesterol support
  • Skin moisturizing and barrier care
  • Part of intravenous (IV) nutrition in hospitals
  • Carrier oil in supplements and cosmetics

Soybean oil is a common edible vegetable oil rich in polyunsaturated fats, including omega-6 and some omega-3 fatty acids. As part of a balanced diet it may help support healthy cholesterol when it replaces saturated fats, but it is high in calories, and people with soy allergy should be careful. Talk to your pharmacist or doctor before using it as a supplement.

Glycine max · Fabaceae · Oil pressed from the seeds (soybeans) · Cooking oil, softgel capsules, emulsions used in intravenous nutrition, topical skin products, and an ingredient in many processed foods

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

Soybean Oil: dosing

There is no official standardized supplement dose of soybean oil. As a food, it is used in normal cooking amounts, and as part of a healthy diet experts generally suggest replacing saturated fats with unsaturated oils rather than simply adding more oil.For supplement products such as softgels, follow the directions on the product label.

From our Soybean Oil monograph — the full record covers uses, side effects and every documented interaction.

Read the full Soybean Oil monograph & all interactions
Medication

About Thiotepa Injection

What Is Thiotepa Injection Used For?

Brand names: Thioplex, Tepadina

Tepadina (thiotepa) injection is used for several purposes. It treats adenocarcinoma (a type of cancer) of the breast or ovary. It is also used to control malignant effusions — abnormal fluid buildup in body cavities caused by cancer spreading to those areas. For bladder cancer, Tepadina treats superficial papillary carcinoma of the urinary bladder.

Tepadina is also used in pediatric patients with class 3 beta-thalassemia (a severe inherited blood disorder). In those patients, it is given as part of a preparative regimen — a conditioning treatment to reduce the risk of graft rejection before an allogeneic stem cell transplant (a transplant using donor stem cells), alongside the chemotherapy drugs busulfan and cyclophosphamide.

Most-Reported Side Effects for Thiotepa

From FAERS, the FDA’s public side-effect reporting system (9,494 reports, all brands). Reports are voluntary and are not proof the drug caused the effect.

Febrile neutropenia 814 reports
Mucosal inflammation 807 reports
Cytomegalovirus infection 533 reports
Fever 516 reports
Acute graft versus host disease 458 reports
See full Thiotepa Injection drug information
Keep checking

Other Drugs & Soybean Oil

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

0Major
0Moderate
0Minor
2,829No known interaction
2,829 No interaction
No interaction 2,829 drugs checked — show the list

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

Showing the 60 most looked-up of 2,829 medications checked with no known interaction — see the full Soybean Oil list.

See the full Soybean Oil interactions page
See every supplement checked against Thiotepa, ranked by severity
Evidence & sources

Soybean Oil References

The 11 references that drive our Soybean Oil 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. Eigenmann PA, Burks AW, Bannon GA, et al. Identification of unique peanut and soy allergens in sera adsorbed with cross-reacting antibodies. J Allergy Clin Immunol 1996;98:969-78. PubMed
  2. Bardare M, Magnolfi C, Zani G. Soy sensitivity: personal observation on 71 children with food intolerance. Allerg Immunol (Paris) 1988;20:63-6.
  3. Fradin MS, Day JF. Comparative efficacy of insect repellents against mosquito bites. N Engl J Med 2002;347:13-8. PubMed
  4. Public Health Agency of Canada. Canadian Recommendations for the Prevention and Treatment of Malaria Among International Travellers. Available at: http://www.phac-aspc.gc.ca/publicat/ccdr-rmtc/04vol30/30s1/page2_e.html (Accessed 24 May 2005).
  5. Duenas-Laita A, Pineda F, Armentia A. Hypersensitivity to generic drugs with soybean oil. N Engl J Med 2009;361(13):1317-8. PubMed
  6. Karupaiah T, Chuah KA, Chinna K, et al. Comparing effects of soybean oil- and palm olein-based mayonnaise consumption on the plasma lipid and lipoprotein profiles in human subjects: a double-blind randomized controlled trial with cross-over design. Lipids PubMed
  7. FDA completes review of qualified health claim petition for oleic acid and the risk of coronary heart disease. November 2018. Available at: www.fda.gov/Food/NewsEvents/ConstituentUpdates/ucm624758.htm. Accessed January 25, 2019.
  8. FDA. RE: Qualified Health Claim Petition - Soybean Oil and Reduced Risk of Coronary Heart Disease (Docket No. FDA-2016-Q-0995). July 2017. Available at: https://www.fda.gov/media/106649/download. Accessed on March 16, 2020.
  9. Stonehouse W, Sergi D, Benassi-Evans B, et al. Eucaloric diets enriched in palm olein, cocoa butter, and soybean oil did not differentially affect liver fat concentration in healthy participants: a 16-week randomized controlled trial. Am J Clin Nutr 2021; PubMed
  10. Wu MY, Du MH, Wen H, Wang WQ, Tang J, Shen LR. Effects of n-6 PUFA-rich soybean oil, MUFA-rich olive oil and camellia seed oil on weight and cardiometabolic profiles among Chinese women: a 3-month double-blind randomized controlled-feeding trial. Food Fun PubMed
  11. Peppone LJ, Inglis JE, Mustian KM, et al. Multicenter randomized controlled trial of omega-3 fatty acids versus omega-6 fatty acids for the control of cancer-related fatigue among breast cancer survivors. JNCI Cancer Spectr. 2019;3(2):pkz005. 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 Soybean Oil and Thiotepa Together: Common Questions

Is it safe to take Soybean Oil with Thiotepa?
We do not list a known interaction between Soybean Oil and Thiotepa. 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 Soybean Oil and Thiotepa 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.
Does Thiotepa interact with any supplements?
Yes. Thiotepa has documented interactions with 146 supplements in our database — Soybean Oil is not one of them. The Thiotepa 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

Soybean Oil monograph Uses, safety profile, and every drug interaction in one place Thiotepa Injection drug information The full plain-English guide to this medication Thiotepa supplement interactions Every supplement checked against Thiotepa, 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 11 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Thiotepa and Soybean Oil?

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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.