Drug & supplement interaction

Weight Watchers Diet + Sirolimus

Sirolimus brand name: Rapamune.

No Known Interaction
Medically reviewed by · Updated June 2026 · Pair last verified Sep 13, 2026
The bottom line No known interaction

We found no known interaction between Weight Watchers Diet and Sirolimus 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

Weight Watchers Diet and Sirolimus

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

Weight Watchers 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.

Weight Watchers Diet safety at a glance

Weight Watchers Di... overall Use caution Generally safe for most healthy adults, but check with a clinician if you have health conditions or take medications.
Pregnancy Use caution Weight loss is usually not advised during pregnancy; speak with your doctor about appropriate nutrition.
Breastfeeding Use caution Calorie restriction may affect milk supply, so discuss any diet plan with your healthcare provider first.

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

Still wondering about combining Sirolimus and Weight Watchers Diet? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
How we checked

Why No Interaction Is Listed for Sirolimus

Interactions in our licensed database are recorded against drug classes, not just single drug names. Sirolimus is filed under 5 classifications — including immunosuppressants, p-glycoprotein substrates, cytochrome p450 3a4 (cyp3a4) substrates. Weight Watchers Diet has documented interactions with 1 drug class — the most serious being antidiabetes drugs (moderate) — and none of Sirolimus’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

Weight Watchers Diet Does Interact With Other Medications

Weight Watchers Diet has 86 moderate known drug interactions in our database — Sirolimus isn’t one of them. If you take anything else, check it against the full list below.

Moderate 86 No known interaction 2,744 (incl. Sirolimus)
Taking anything else?

Check Another of Your Medications Against Weight Watchers Diet

Covers the 2,830 medications we’ve checked against Weight Watchers Diet. Pick one to open its full report.

What to actually watch for

What Sirolimus’s Own FDA Label Lists

This is not an interaction — none of it involves Weight Watchers Diet. These are the most notable effects listed in the ADVERSE REACTIONS section of Sirolimus’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 Weight Watchers Diet and take the medicine. 10 of them are worth acting on rather than waiting out — marked below.

  • High potassium Worth acting on
  • Low potassium Worth acting on
  • Blood clots Worth acting on
  • Pancreatitis Worth acting on
  • High blood sugar Worth acting on
  • Chest pain Worth acting on
  • A low platelet count Worth acting on
  • Kidney problems Worth acting on
  • Anemia Worth acting on
  • Raised blood pressure 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 Sirolimus. Read the label on DailyMed › Weight Watchers Diet’s licensed record lists no adverse effects our clinical vocabulary could match, so there is no Weight Watchers Diet side to compare — that is a limit of the record, not a statement that Weight Watchers Diet has no side effects.

From our Q&A

Questions About Weight Watchers Diet or Sirolimus

These are real questions from readers, answered by the pharmacists at HelloPharmacist — written by a person, not generated from a database. Each one covers Weight Watchers Diet or Sirolimus, not necessarily both, but if one is close to what you were about to ask it will usually go further than a database entry can:

Not quite your question? Ask our pharmacists directly — it is free, there is no account required, and answers usually come back within 24 hours.

Everything else you take

See Every Supplement That Interacts With Sirolimus

This page covers Weight Watchers Diet only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Sirolimus page lists 188 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 Active Hexose Correlated Compound (ahcc) (moderate).

By severity: 3 major · 149 moderate · 36 minor.

From our pharmacist’s overview on the Sirolimus page

“Sirolimus (Rapamune) is the anti-rejection medicine transplant patients depend on, and it is a narrow-therapeutic-index drug, meaning small shifts in its blood level can invite rejection on one side or toxicity on the other. That is why the 188 supplements on this page deserve genuine wariness, starting with the three rated major.”

Reviewed by 2 · Jul 18, 2026

Open the Sirolimus interaction page

How much people look this up

Where Weight Watchers Diet and Sirolimus 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 Weight Watchers Diet
Steady interest

#1,128 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Sirolimus
Steady interest

#2,215 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 Weight Watchers Diet reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 13, 2026. The Weight Watchers Diet and Sirolimus 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 Weight Watchers Diet

What is Weight Watchers Diet?

  • Weight loss
  • Weight maintenance
  • Building healthier eating habits
  • Behavioral support for diet change
  • General wellness and lifestyle improvement

Weight Watchers (now called WW) is a commercial weight-loss program built around a points system, food tracking, and group or online support rather than a pill or herbal product. Research generally shows it can help people lose a modest amount of weight and keep some of it off, especially when combined with regular activity. Talk with your doctor or pharmacist before starting any weight-loss plan, particularly if you have a medical condition.

Not applicable (this is a commercial weight-management program, not a plant or supplement) · Structured eating plan with a points-based food system, app, group or online support, and coaching

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

Weight Watchers Diet: dosing

There is no pill or standardized dose for Weight Watchers, since it is a behavioral eating program. Instead, you follow the program's points budget and tracking system as set up in the app or plan you select.The right calorie or points target depends on your age, sex, weight, activity level, and goals, and the program personalizes this for you.

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

Read the full Weight Watchers Diet monograph & all interactions
Medication

About Sirolimus

What Is Sirolimus Used For?

Brand name: Rapamune

Sirolimus oral solution and tablets are used to help prevent organ rejection in kidney (renal) transplant patients aged 13 and older. They are also used to treat lymphangioleiomyomatosis (LAM) — a rare lung disease in which abnormal muscle-like cells invade lung tissue.

Fyarro (sirolimus, intravenous injection) is used to treat adults with locally advanced, unresectable, or metastatic malignant PEComa — a rare tumor that grows in soft tissue or organs. Hyftor (sirolimus topical gel) is used to treat facial angiofibroma (small benign skin growths on the face) associated with tuberous sclerosis in adults and children aged 6 and older.

Most-Reported Side Effects for Sirolimus

From FAERS, the FDA’s public side-effect reporting system (13,394 reports, all brands). Reports are voluntary and are not proof the drug caused the effect.

Fever 525 reports
Diarrhea 515 reports
Pneumonia 487 reports
Acute kidney injury 435 reports
Thrombotic microangiopathy 376 reports
See full Sirolimus drug information
Keep checking

Other Drugs & Weight Watchers Diet

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

0Major
86Moderate
0Minor
2,743No known interaction
86 Moderate 2,743 No interaction
Moderate

86 interactions

Showing 60 of 86 moderate interactions — see all 86 on the Weight Watchers Diet page.

No interaction 2,743 drugs checked — show the list

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

Showing the 60 most looked-up of 2,743 medications checked with no known interaction — see the full Weight Watchers Diet list.

See the full Weight Watchers Diet interactions page
See every supplement checked against Sirolimus, ranked by severity
Evidence & sources

Weight Watchers Diet References

The 1 references that drive our Weight Watchers 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. O'Neil PM, Miller-Kovach K, Tuerk PW, et al. Randomized controlled trial of a nationally available weight control program tailored for adults with type 2 diabetes. Obesity (Silver Spring). 2016;24(11):2269-2277. 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 Weight Watchers Diet While Taking Sirolimus: Common Questions

Is it safe to follow Weight Watchers Diet while taking Sirolimus?
We do not list a known interaction between Weight Watchers Diet and Sirolimus. 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.
How was the Weight Watchers Diet and Sirolimus combination checked?
Interactions in our licensed database are recorded against drug classes. Sirolimus is filed under 5 classifications, and Weight Watchers Diet has documented interactions with 1 drug class — none of Sirolimus'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 Weight Watchers Diet interact with any other medications?
Yes. Weight Watchers Diet has 86 documented drug interactions in our database — Sirolimus 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 Sirolimus interact with any supplements?
Yes. Sirolimus has documented interactions with 188 supplements in our database — Weight Watchers Diet is not one of them. The Sirolimus 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

Weight Watchers Diet monograph Uses, safety profile, and every drug interaction in one place Sirolimus drug information The full plain-English guide to this medication Sirolimus supplement interactions Every supplement checked against Sirolimus, 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 Sirolimus and Weight Watchers 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.