Drug & supplement interaction

Jenny Craig Diet + Lapatinib

Lapatinib brand name: Tykerb.

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 Jenny Craig Diet and Lapatinib 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

Jenny Craig Diet and Lapatinib

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

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

Jenny Craig 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.

Jenny Craig Diet safety at a glance

Jenny Craig Diet overall Use caution Generally considered reasonable for healthy adults, but check with a clinician first if you have any medical condition.
Pregnancy Use caution Weight-loss dieting is usually not recommended during pregnancy; speak with your obstetrician first.
Breastfeeding Use caution Calorie needs are higher while breastfeeding, so discuss any weight-loss plan with your doctor.

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

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

What Lapatinib’s Own FDA Label Lists

This is not an interaction — none of it involves Jenny Craig Diet. These are the most notable effects listed in the ADVERSE REACTIONS section of Lapatinib’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 Jenny Craig Diet and take the medicine.

  • Diarrhea mentioned in 27.1% of FDA reports for Lapatinib
  • Acne
  • Mouth irritation or sores
  • Tiredness mentioned in 8.5% of FDA reports for Lapatinib
  • Vomiting mentioned in 7.8% of FDA reports for Lapatinib
  • A skin rash mentioned in 6.9% of FDA reports for Lapatinib
  • Nausea mentioned in 10.5% of FDA reports for Lapatinib

From the ADVERSE REACTIONS section of the FDA label for Lapatinib. Read the label on DailyMed › Where a percentage is shown, it is the share of 15,427 voluntary FDA FAERS reports for Lapatinib that mention that effect — a reporting proportion, not an incidence rate and not evidence the drug caused it. Jenny Craig Diet’s licensed record lists no adverse effects our clinical vocabulary could match, so there is no Jenny Craig Diet side to compare — that is a limit of the record, not a statement that Jenny Craig Diet has no side effects.

Everything else you take

See Every Supplement That Interacts With Lapatinib

This page covers Jenny Craig Diet only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Lapatinib page lists 143 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 · 100 moderate · 40 minor.

From our pharmacist’s overview on the Lapatinib page

“Of the 143 supplements on file for lapatinib (Tykerb), nearly all press on the same point, the CYP3A4 enzyme that clears this HER2-targeted breast cancer drug. That deserves real caution, since lapatinib only works when its blood level stays in range.”

Reviewed by 2 · Jul 18, 2026

Open the Lapatinib interaction page

How much people look this up

Where Jenny Craig Diet and Lapatinib 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 Jenny Craig Diet
Steady interest

#1,262 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Lapatinib
Steady interest

#1,424 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. Jenny Craig Diet is not yet covered by that licensed database, so its write-up cites publicly available medical sources directly (see the references below).
  • Citation library: 103,510 references behind our interaction content, 65,311 of them resolved to verified PubMed/DOI sources. See every Jenny Craig Diet reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 20, 2026. The Jenny Craig Diet and Lapatinib 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 Jenny Craig Diet

What is Jenny Craig Diet?

  • Weight loss
  • Weight management
  • Portion control
  • Building healthier eating habits
  • Support for blood sugar control through weight loss

The Jenny Craig Diet is a commercial weight-loss program, not a supplement or herb. It uses prepackaged, portion-controlled meals plus personal coaching to help people lose weight, and research generally shows structured meal-replacement programs like this can produce real short-term weight loss. Talk with your doctor or pharmacist before starting, especially if you have a medical condition.

Prepackaged meals, snacks, shakes, and a structured menu plan with personal coaching

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

Jenny Craig Diet: dosing

There is no "dose" for the Jenny Craig Diet the way there is for a supplement. Instead, the program sets a daily calorie target and menu based on factors like your weight, sex, and goals, usually using their prepackaged meals plus added produce and dairy.Follow the plan and serving guidance provided by the program, and don't drop your calories lower than recommended on your own.

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

Read the full Jenny Craig Diet monograph & all interactions
Medication

About Lapatinib

What Is Lapatinib Used For?

Brand name: Tykerb

Lapatinib tablets — sold under the brand name Tykerb — are used to treat advanced or metastatic breast cancer in patients whose tumors overexpress the HER2 protein. They are always used in combination with another medicine, not alone.

Tykerb is approved in combination with capecitabine for HER2-positive advanced or metastatic breast cancer in patients who have already received prior treatment including an anthracycline, a taxane, and trastuzumab, and whose disease has progressed on trastuzumab. Tykerb is also approved in combination with letrozole for postmenopausal women with hormone receptor-positive, HER2-positive metastatic breast cancer when hormonal therapy is appropriate.

Most-Reported Side Effects for Lapatinib

From FAERS, the FDA’s public side-effect reporting system (15,427 reports, all brands). Reports are voluntary and are not proof the drug caused the effect.

Diarrhea 4,174 reports
Nausea 1,615 reports
Fatigue 1,305 reports
Vomiting 1,209 reports
Rash 1,061 reports
See full Lapatinib drug information
Keep checking

Other Drugs & Jenny Craig Diet

Browse every other medication we’ve checked against Jenny Craig 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 Jenny Craig 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 Jenny Craig Diet list.

See the full Jenny Craig Diet interactions page
See every supplement checked against Lapatinib, ranked by severity
Evidence & sources

Jenny Craig Diet References

The 1 sources that drive our Jenny Craig Diet monograph — publicly available pages from reputable medical and government organizations. Every link was verified to work before publishing. Jenny Craig Diet is not covered by the licensed Natural Medicines interaction database, so its page cites these public sources directly.

  1. Weight Control — MedlinePlus Source

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 Jenny Craig Diet While Taking Lapatinib: Common Questions

Is it safe to follow Jenny Craig Diet while taking Lapatinib?
We do not list a known interaction between Jenny Craig Diet and Lapatinib. 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 Lapatinib interact with any supplements?
Yes. Lapatinib has documented interactions with 143 supplements in our database — Jenny Craig Diet is not one of them. The Lapatinib 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

Jenny Craig Diet monograph Uses, safety profile, and every drug interaction in one place Lapatinib drug information The full plain-English guide to this medication Lapatinib supplement interactions Every supplement checked against Lapatinib, 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 1 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Lapatinib and Jenny Craig 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.