Drug & supplement interaction

Slimfast Diet + Ibrutinib

Ibrutinib brand name: Imbruvica.

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

We found no known interaction between Slimfast Diet and Ibrutinib 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.

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Interaction report

Slimfast Diet and Ibrutinib

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 Ibrutinib and Slimfast Diet in our sources. This does not guarantee that the combination is completely free of risk — research on Slimfast Diet alongside specific medications may be limited.

Worth understanding: our licensed dataset holds no drug-interaction record for Slimfast Diet at all — not against Ibrutinib, 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.

Slimfast Diet is an eating pattern rather than something you take. Ask your pharmacist or doctor before changing how you eat while on a prescribed medicine: some medicines are dosed around meals, and a change in diet can change how they work. 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.

Slimfast Diet safety at a glance

Slimfast Diet overall Use caution Generally well tolerated for healthy adults, but it is a food-based plan rather than a tested medicine and is not right for everyone.
Pregnancy Use caution Calorie-restricting diet plans are not recommended during pregnancy; speak with your doctor about nutrition needs.
Breastfeeding Use caution Restricting calories while breastfeeding may not be appropriate; check with your doctor before using a meal-replacement plan.

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

Still wondering about combining Ibrutinib and Slimfast Diet? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
What to actually watch for

What Ibrutinib’s Own FDA Label Lists

This is not an interaction — none of it involves Slimfast Diet. These are the most notable effects listed in the ADVERSE REACTIONS section of Ibrutinib’s own FDA label, for the medication by itself. Knowing the drug’s own list makes it easier to work out the likely cause if something new turns up while you follow Slimfast Diet and take the medicine. 10 of them are worth acting on rather than waiting out — marked below.

  • Heart failure Worth acting on
  • An irregular heartbeat Worth acting on
  • A low platelet count Worth acting on
  • Anemia Worth acting on
  • Raised blood pressure Worth acting on
  • Shortness of breath Worth acting on
  • A low white blood cell count Worth acting on
  • Liver problems Worth acting on
  • Bleeding or bruising Worth acting on
  • A higher chance of infection Worth acting on

Showing the 10 most notable of 32 label-listed effects — ranked by how unusual each one is across medicines generally, with serious effects weighted up.

From the ADVERSE REACTIONS section of the FDA label for Ibrutinib. Read the label on DailyMed › Slimfast Diet’s licensed record lists no adverse effects our clinical vocabulary could match, so there is no Slimfast Diet side to compare — that is a limit of the record, not a statement that Slimfast Diet has no side effects.

Everything else you take

See Every Supplement That Interacts With Ibrutinib

This page covers Slimfast Diet only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Ibrutinib page lists 282 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Danshen (major), Grapefruit (major), Piracetam (major) and St. John's Wort (major).

By severity: 5 major · 236 moderate · 41 minor.

From our pharmacist’s overview on the Ibrutinib page

“Ibrutinib (Imbruvica) treats blood cancers such as chronic lymphocytic leukemia, and because the drug itself makes bruising and bleeding more likely, adding the wrong supplement here can carry real consequences. Most of the entries below have blood-thinning or antiplatelet activity that stacks on top of that built-in bleeding risk.”

Reviewed by 2 · Jul 18, 2026

Open the Ibrutinib interaction page

How much people look this up

Where Slimfast Diet and Ibrutinib 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 Slimfast Diet
Steady interest

#1,218 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Ibrutinib
Top 25%

#554 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 Slimfast Diet reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 20, 2026. The Slimfast Diet and Ibrutinib records this page draws on were last updated June 22, 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 .
Eating pattern

About Slimfast Diet

What is Slimfast Diet?

  • Weight loss
  • Weight maintenance
  • Meal replacement
  • Calorie control
  • Convenient on-the-go nutrition

SlimFast is a commercial brand of meal-replacement shakes, bars, and snacks designed to help with weight loss by controlling daily calories. It is not an herb or single supplement, and while structured meal-replacement plans can help some people lose weight in the short term, long-term success depends on overall diet and lifestyle. Talk with your doctor or pharmacist before starting if you have a medical condition such as diabetes.

Not applicable (commercial meal-replacement product, not a plant) · Ready-to-drink shakes, shake powders, meal-replacement bars, and snack products

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

Slimfast Diet: dosing

There is no medicinal "dose" for SlimFast because it is a food product. Instead, follow the plan and serving sizes printed on the product label. A common approach is replacing one or two meals a day with a SlimFast shake or bar, eating one balanced meal, and having a small snack or two.Drink plenty of water and aim to keep your overall diet balanced.

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

Read the full Slimfast Diet monograph & all interactions
Medication

About Ibrutinib

What Is Ibrutinib Used For?

Brand name: Imbruvica

Imbruvica (ibrutinib) is used in adults to treat chronic lymphocytic leukemia (CLL) and small lymphocytic lymphoma (SLL), including cases with a specific genetic change called 17p deletion. It is also used in adults to treat Waldenström's macroglobulinemia (WM), a rare type of slow-growing blood cancer.

Imbruvica is also approved for adults and children aged 1 year and older with chronic graft-versus-host disease (cGVHD) — a serious immune complication that can occur after a stem cell or bone marrow transplant — when at least one prior treatment has not worked.

Most-Reported Side Effects for Ibrutinib

From FAERS, the FDA’s public side-effect reporting system (0 reports, all brands). Reports are voluntary and are not proof the drug caused the effect.

Fatigue 4,752 reports
Diarrhea 4,191 reports
Atrial fibrillation 3,894 reports
Pneumonia 3,263 reports
Contusion 2,820 reports
See full Ibrutinib drug information
Keep checking

Other Drugs & Slimfast Diet

Browse every other medication we’ve checked against Slimfast Diet — 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 Slimfast Diet 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 Slimfast Diet list.

See the full Slimfast Diet interactions page
See every supplement checked against Ibrutinib, ranked by severity
Evidence & sources

Slimfast Diet References

The 6 references that drive our Slimfast Diet 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. Pritchett AM, Deswal A, Aguilar D, et al. Lifestyle Modification with Diet and Exercise in Obese Patients with Heart Failure - A Pilot Study. J Obes Weight Loss Ther. 2012 Mar 1;2(2):1-8. PubMed
  2. Berkowitz RI, Wadden TA, Gehrman CA, et al. Meal replacements in the treatment of adolescent obesity: a randomized controlled trial. Obesity (Silver Spring). 2011 Jun;19(6):1193-9. PubMed
  3. Morgan LM, Griffin BA, Millward DJ, et al. Comparison of the effects of four commercially available weight-loss programmes on lipid-based cardiovascular risk factors. Public Health Nutr. 2009 Jun;12(6):799-807. PubMed
  4. Truby H, Baic S, deLooy A, et al. Randomised controlled trial of four commercial weight loss programmes in the UK: initial findings from the BBC "diet trials." BMJ. 2006 Jun 3;332(7553):1309-14. PubMed
  5. Noakes M, Foster PR, Keogh JB, Clifton PM. Meal replacements are as effective as structured weight-loss diets for treating obesity in adults with features of metabolic syndrome. J Nutr. 2004 Aug;134(8):1894-9. PubMed
  6. Yip I, Go VL, DeShields S, et al. Liquid meal replacements and glycemic control in obese type 2 diabetes patients. Obes Res. 2001 Nov;9 Suppl 4:341S-347S. 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

Following Slimfast Diet While Taking Ibrutinib: Common Questions

Is it safe to follow Slimfast Diet while taking Ibrutinib?
We do not list a known interaction between Slimfast Diet and Ibrutinib. 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.
Does Ibrutinib interact with any supplements?
Yes. Ibrutinib has documented interactions with 282 supplements in our database — Slimfast Diet is not one of them. The Ibrutinib 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

Slimfast Diet monograph Uses, safety profile, and every drug interaction in one place Ibrutinib drug information The full plain-English guide to this medication Ibrutinib supplement interactions Every supplement checked against Ibrutinib, 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 6 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Ibrutinib and Slimfast Diet?

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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.