Herb & supplement monograph

Weight Watchers Diet Drug Interactions, Uses, Effectiveness, Safety & More

Medically reviewed by ·Updated June 2026
What is this page for?

First and foremost: how Weight Watchers Diet interacts with medications. The heart of this page is the interaction list — every drug Weight Watchers Diet is known to interact with, and how serious each one is.

But these pages have grown well beyond that into a full monograph — what Weight Watchers Diet is, what people use it for and how strong the evidence is, its safety and side effects, and answers to the questions we’re asked most — written and reviewed by the clinical staff at HelloPharmacist. It’s educational information from our licensed clinical databases, not medical advice, and we don’t sell or endorse products. Our editorial policy

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Interaction report

Drugs that interact with Weight Watchers Diet

86 medications have a known interaction with Weight Watchers Diet, graded by severity. Select any drug for the full evidence-based detail.

2,830 drugs
AcarboseGlucobay, Prandase, Precose
Moderate Antidiabetes Drugs

Following the Weight Watchers diet while taking antidiabetes drugs may increase the risk of hypoglycemia.

Read the full Weight Watchers Diet + Acarbose interaction Acarbose drug page: uses, dosage & side effects
AcetohexamideDymelor
Moderate Antidiabetes Drugs

Following the Weight Watchers diet while taking antidiabetes drugs may increase the risk of hypoglycemia.

Read the full Weight Watchers Diet + Acetohexamide interaction
AlbiglutideTanzeum
Moderate Antidiabetes Drugs

Following the Weight Watchers diet while taking antidiabetes drugs may increase the risk of hypoglycemia.

Read the full Weight Watchers Diet + Albiglutide interaction
AlogliptinNesina
Moderate Antidiabetes Drugs

Following the Weight Watchers diet while taking antidiabetes drugs may increase the risk of hypoglycemia.

Read the full Weight Watchers Diet + Alogliptin interaction Alogliptin drug page: uses, dosage & side effects
Alogliptin, MetforminKazano
Moderate Antidiabetes Drugs

Following the Weight Watchers diet while taking antidiabetes drugs may increase the risk of hypoglycemia.

Read the full Weight Watchers Diet + Alogliptin, Metformin interaction
Alogliptin, PioglitazoneOseni
Moderate Antidiabetes Drugs

Following the Weight Watchers diet while taking antidiabetes drugs may increase the risk of hypoglycemia.

Read the full Weight Watchers Diet + Alogliptin, Pioglitazone interaction
Antidiabetes, Dipeptidyl Peptidase-4 (dpp-iv) InhibitorGlyxambi
Moderate Antidiabetes Drugs

Following the Weight Watchers diet while taking antidiabetes drugs may increase the risk of hypoglycemia.

Read the full Weight Watchers Diet + Antidiabetes, Dipeptidyl Peptidase-4 (dpp-iv) Inhibitor interaction
CanagliflozinInvokana
Moderate Antidiabetes Drugs

Following the Weight Watchers diet while taking antidiabetes drugs may increase the risk of hypoglycemia.

Read the full Weight Watchers Diet + Canagliflozin interaction Canagliflozin drug page: uses, dosage & side effects
Canagliflozin, MetforminInvokamet
Moderate Antidiabetes Drugs

Following the Weight Watchers diet while taking antidiabetes drugs may increase the risk of hypoglycemia.

Read the full Weight Watchers Diet + Canagliflozin, Metformin interaction
Canagliflozin, Metformin HydrochlorideInvokamet XR
Moderate Antidiabetes Drugs

Following the Weight Watchers diet while taking antidiabetes drugs may increase the risk of hypoglycemia.

Read the full Weight Watchers Diet + Canagliflozin, Metformin Hydrochloride interaction
ChlorpropamideChlorpropam, Diabinese
Moderate Antidiabetes Drugs

Following the Weight Watchers diet while taking antidiabetes drugs may increase the risk of hypoglycemia.

Read the full Weight Watchers Diet + Chlorpropamide interaction
DapagliflozinFarxiga
Moderate Antidiabetes Drugs

Following the Weight Watchers diet while taking antidiabetes drugs may increase the risk of hypoglycemia.

Read the full Weight Watchers Diet + Dapagliflozin interaction Dapagliflozin drug page: uses, dosage & side effects
Dapagliflozin Propanediol, MetforminXigduo XR
Moderate Antidiabetes Drugs

Following the Weight Watchers diet while taking antidiabetes drugs may increase the risk of hypoglycemia.

Read the full Weight Watchers Diet + Dapagliflozin Propanediol, Metformin interaction
Dapagliflozin Propanediol, Saxagliptin HydrochlorideQtern
Moderate Antidiabetes Drugs

Following the Weight Watchers diet while taking antidiabetes drugs may increase the risk of hypoglycemia.

Read the full Weight Watchers Diet + Dapagliflozin Propanediol, Saxagliptin Hydrochloride interaction
Dapagliflozin, Metformin Hydrochloride, Saxagliptin HydrochlorideQternmet XR
Moderate Antidiabetes Drugs

Following the Weight Watchers diet while taking antidiabetes drugs may increase the risk of hypoglycemia.

Read the full Weight Watchers Diet + Dapagliflozin, Metformin Hydrochloride, Saxagliptin Hydrochloride interaction
Dasiglucagon HydrochlorideZegalogue
Moderate Antidiabetes Drugs

Following the Weight Watchers diet while taking antidiabetes drugs may increase the risk of hypoglycemia.

Read the full Weight Watchers Diet + Dasiglucagon Hydrochloride interaction Dasiglucagon Hydrochloride drug page: uses, dosage & side effects
DulaglutideTrulicity
Moderate Antidiabetes Drugs

Following the Weight Watchers diet while taking antidiabetes drugs may increase the risk of hypoglycemia.

Read the full Weight Watchers Diet + Dulaglutide interaction Dulaglutide drug page: uses, dosage & side effects
EmpagliflozinJardiance
Moderate Antidiabetes Drugs

Following the Weight Watchers diet while taking antidiabetes drugs may increase the risk of hypoglycemia.

Read the full Weight Watchers Diet + Empagliflozin interaction Empagliflozin drug page: uses, dosage & side effects
Empagliflozin, Linagliptin, Metformin HydrochlorideTrijardy XR
Moderate Antidiabetes Drugs

Following the Weight Watchers diet while taking antidiabetes drugs may increase the risk of hypoglycemia.

Read the full Weight Watchers Diet + Empagliflozin, Linagliptin, Metformin Hydrochloride interaction
Empagliflozin, MetforminSynjardy
Moderate Antidiabetes Drugs

Following the Weight Watchers diet while taking antidiabetes drugs may increase the risk of hypoglycemia.

Read the full Weight Watchers Diet + Empagliflozin, Metformin interaction
Empagliflozin, Metformin HydrochlorideSynjardy XR
Moderate Antidiabetes Drugs

Following the Weight Watchers diet while taking antidiabetes drugs may increase the risk of hypoglycemia.

Read the full Weight Watchers Diet + Empagliflozin, Metformin Hydrochloride interaction
ErtugliflozinSteglatro
Moderate Antidiabetes Drugs

Following the Weight Watchers diet while taking antidiabetes drugs may increase the risk of hypoglycemia.

Read the full Weight Watchers Diet + Ertugliflozin interaction Ertugliflozin drug page: uses, dosage & side effects
Ertugliflozin, Metformin HydrochlorideSegluromet
Moderate Antidiabetes Drugs

Following the Weight Watchers diet while taking antidiabetes drugs may increase the risk of hypoglycemia.

Read the full Weight Watchers Diet + Ertugliflozin, Metformin Hydrochloride interaction
ExenatideBydureon, Byetta
Moderate Antidiabetes Drugs

Following the Weight Watchers diet while taking antidiabetes drugs may increase the risk of hypoglycemia.

Read the full Weight Watchers Diet + Exenatide interaction Exenatide drug page: uses, dosage & side effects
Exenatide SyntheticBydureon BCISE
Moderate Antidiabetes Drugs

Following the Weight Watchers diet while taking antidiabetes drugs may increase the risk of hypoglycemia.

Read the full Weight Watchers Diet + Exenatide Synthetic interaction Exenatide Synthetic drug page: uses, dosage & side effects
GliclazideDiamicron
Moderate Antidiabetes Drugs

Following the Weight Watchers diet while taking antidiabetes drugs may increase the risk of hypoglycemia.

Read the full Weight Watchers Diet + Gliclazide interaction
GlimepirideAmaryl
Moderate Antidiabetes Drugs

Following the Weight Watchers diet while taking antidiabetes drugs may increase the risk of hypoglycemia.

Read the full Weight Watchers Diet + Glimepiride interaction Glimepiride drug page: uses, dosage & side effects
GlipizideGlucotrol, Glucotrol XL
Moderate Antidiabetes Drugs

Following the Weight Watchers diet while taking antidiabetes drugs may increase the risk of hypoglycemia.

Read the full Weight Watchers Diet + Glipizide interaction Glipizide drug page: uses, dosage & side effects
Glipizide, MetforminMetaglip
Moderate Antidiabetes Drugs

Following the Weight Watchers diet while taking antidiabetes drugs may increase the risk of hypoglycemia.

Read the full Weight Watchers Diet + Glipizide, Metformin interaction
GlucagonBaqsimi, Glucagon
Moderate Antidiabetes Drugs

Following the Weight Watchers diet while taking antidiabetes drugs may increase the risk of hypoglycemia.

Read the full Weight Watchers Diet + Glucagon interaction Glucagon drug page: uses, dosage & side effects
Read The List Like a Pharmacist

What Severity, Likelihood & Evidence Mean

Severity — How Serious It Can Be

  • Major. Clinically significant; generally best avoided, or used only under direct professional supervision.
  • Moderate. May need monitoring, a dose adjustment, or separating the times you take each one.
  • Minor. Generally not clinically significant, but still worth noting and mentioning to your pharmacist.
  • No known interaction. Checked against our sources with nothing documented — not the same as proven safety.

Likelihood — How Well It’s Documented

  • Likely. Well-controlled human studies have demonstrated the likely existence of this interaction
  • Probable. Interaction has not been documented in well-controlled studies, however, the interaction has been demonstrated in some small human studies or in controlled animal studies in conjunction with multiple case reports.
  • Possible. Interaction has been documented in animal or in lab research, or the interaction has been documented in humans but is limited to case reports or conflicting clinical research exists
  • Unlikely. Interaction has been demonstrated in animal or in lab research but has been shown not to occur in humans.

Where This Data Comes From

  • Interaction records are evidence-graded and sourced from the Natural Medicines database (TRC Healthcare), the same reference used by pharmacists and hospitals.
  • Each drug listed above links to the full report for that exact Weight Watchers Diet combination — clinical detail, likelihood, evidence level, and citations.
  • Content is reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.
The big picture

The kinds of drugs Weight Watchers Diet affects

Every type of medication (drug category) Weight Watchers Diet is known to interact with. Open any category for the detail — or search your exact drug in the checker above.

All 1 drug category Weight Watchers Diet interacts with
Antidiabetes Drugs
Antidiabetes Drugs

Following the Weight Watchers diet while taking antidiabetes drugs may increase the risk of hypoglycemia.
Hypoglycemia has occurred in a small number of patients with type 2 diabetes who are taking antidiabetes medications and following the Weight Watchers Diet. Dose adjustments of antidiabetes medications might be necessary for some people.

Likelihood Possible Evidence B
Monograph

Weight Watchers Diet: Uses, Safety & Side Effects

Medically reviewed by · Reviewed June 2026 ·
The bottom line

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.

Part used
Not applicable (this is a commercial weight-management program, not a plant or supplement)
Common forms
Structured eating plan with a points-based food system, app, group or online support, and coaching
People commonly use it for
  • Weight loss
  • Weight maintenance
  • Building healthier eating habits
  • Behavioral support for diet change
  • General wellness and lifestyle improvement

Popular and traditional uses — not proof it works. See “Uses & effectiveness” below for the evidence.

Safety at a glance
OverallUse caution

Generally safe for most healthy adults, but check with a clinician if you have health conditions or take medications.

PregnancyInsufficient reliable information

There is insufficient reliable information available about the safety of the Weight Watchers diet when pregnant or lactating. However, there is no rea...

Read the full pregnancy detail
BreastfeedingInsufficient reliable information

There is insufficient reliable information available about the safety of the Weight Watchers diet when pregnant or lactating. However, there is no rea...

Read the full breastfeeding detail

Pregnancy & breastfeeding ratings are from Natural Medicines (Therapeutic Research Center). Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

Jump to a section

Overview

Weight Watchers, now branded as WW, is a commercial weight-management program. It is not an herb, plant, or dietary supplement. Instead, it is a structured lifestyle and eating plan that you follow with the help of an app, online tools, and sometimes in-person or virtual group meetings and coaching.

The program is best known for its points-based food system, which assigns values to foods and drinks to help guide daily choices. The goal is to encourage balanced eating, awareness of portion sizes, and steady habit change rather than rapid dieting.

People typically join WW to lose weight, maintain weight loss, or simply build healthier routines around food and activity. Because it focuses on behavior and accountability, it is often grouped with lifestyle programs rather than products you buy at a pharmacy.

How it works

Weight Watchers works mainly through behavior change, not through any active ingredient. The points system simplifies calorie and nutrition tracking, nudging people toward foods that are more filling and nutritious (like fruits, vegetables, and lean proteins) and away from foods high in added sugar and unhealthy fat.

The program also relies on self-monitoring, goal-setting, and social support. Tracking what you eat and connecting with coaches or groups can increase accountability and motivation, which are known to support long-term diet success.

In simple terms, weight loss happens because the plan helps you take in fewer calories than you burn while keeping meals reasonably balanced and satisfying.

Effectiveness

Does Weight Watchers Diet work?

Here’s what the research actually shows for each use — graded by Natural Medicines and reviewed by .

Evidence overview · 3 uses evaluated
3 Possibly effective
How to read these evidence grades

Natural Medicines’ 7-point scale. We show each rating’s label word-for-word.

1EffectiveStrong, consistent evidence it works.
2Likely EffectiveGood evidence, though not yet conclusive.
3Possibly EffectiveSome evidence suggests a benefit.
4Possibly IneffectiveSome evidence it may not help.
5Likely IneffectiveFairly strong evidence it doesn’t help.
6IneffectiveStrong evidence it doesn’t work.
7Insufficient Reliable Evidence to RateToo little research to say either way.
Possibly Effective Diabetes
Rating & evidence shown verbatim from Natural Medicines

Clinical research shows that the Weight Watchers diet may increase weight loss and improve glycemic control in adults with type 2 diabetes, although it is unclear if it is superior to other weight loss programs.

Possibly Effective Impaired glucose tolerance (prediabetes)
Rating & evidence shown verbatim from Natural Medicines

The Weight Watchers diet seems to improve weight loss in adults with prediabetes.

Possibly Effective Obesity
Rating & evidence shown verbatim from Natural Medicines

Clinical studies show that the Weight Watchers diet can improve weight loss, although its effects may be similar to those seen with other diets.

Source & disclaimer. Effectiveness ratings and evidence summaries are provided by Natural Medicines (Therapeutic Research Center) and shown as licensed. Where Natural Medicines hasn’t rated a use, HelloPharmacist’s pharmacists may add their own reviewed rating and evidence (each such entry is labeled). This is educational information, not medical advice — talk with your pharmacist or doctor before starting, stopping, or changing a supplement.

Safety & precautions

For most healthy adults, following a balanced, calorie-aware eating plan like WW is generally safe. Because the program emphasizes whole foods and does not require extreme restriction, it is usually considered a reasonable approach to weight management.

Still, some people should be cautious. If you have diabetes, an eating disorder history, kidney disease, or other chronic conditions, or if you take medications that affect appetite or blood sugar, talk with your doctor or pharmacist before starting. Children and teens should only follow weight-management plans under medical supervision.

During pregnancy, intentional weight loss is generally not recommended, and you should follow nutrition guidance from your healthcare provider. While breastfeeding, cutting calories too sharply may affect energy and milk supply, so any diet plan should be discussed with a clinician first.

Side effects

Because Weight Watchers is a food and lifestyle program rather than a supplement, it does not cause drug-like side effects. However, any weight-loss effort can lead to hunger, fatigue, irritability, or low energy, especially early on.

Cutting calories too quickly or too far may cause headaches, dizziness, or nutrient gaps if meals are not well balanced. Some people may also experience frustration or stress around food tracking, which is worth watching for, particularly in anyone prone to disordered eating.

If you feel unwell, very weak, or notice signs of an unhealthy relationship with food, stop and check in with a healthcare professional.

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. A safe, sustainable rate of weight loss for most adults is gradual rather than rapid.

If you have a medical condition, are pregnant or breastfeeding, or take medications, ask your doctor or pharmacist to help confirm that the plan's calorie goals are appropriate for you.

Pregnancy & Breastfeeding

Weight Watchers Diet & Pregnancy

Insufficient reliable information

There is insufficient reliable information available about the safety of the Weight Watchers diet when pregnant or lactating. However, there is no reason to expect safety concerns as long as nutritional needs are met.

Weight Watchers Diet & Breastfeeding

Insufficient reliable information

There is insufficient reliable information available about the safety of the Weight Watchers diet when pregnant or lactating. However, there is no reason to expect safety concerns as long as nutritional needs are met.

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

Pregnancy & lactation ratings: Natural Medicines, Therapeutic Research Center

References & further reading

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
Keep reading

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.

Parts of this content are provided by the Therapeutic Research Center, LLC.

DISCLAIMER: Currently this does not check for drug-drug interactions. This is not an all-inclusive comprehensive list of potential interactions and is for informational purposes only. Not all interactions are known or well-reported in the scientific literature, and new interactions are continually being reported. Input is needed from a qualified healthcare provider including a pharmacist before starting any therapy. Application of clinical judgment is necessary.

© 2021 Therapeutic Research Center, LLC

Pharmacist Counseling Corner

Weight Watchers Diet: Common Questions

What is Weight Watchers Diet used for, and does it work?
People use Weight Watchers Diet for many reasons, but the evidence varies by use. According to the Natural Medicines database, there is at least some clinical evidence supporting Weight Watchers Diet for Diabetes, Impaired glucose tolerance (prediabetes) and Obesity. For most other uses it has been studied for, the evidence is currently insufficient to rate. See the graded list on this page, and always confirm with your pharmacist or doctor.
Does Weight Watchers Diet interact with prescription medications?
Yes. We list 86 medications with a known interaction with Weight Watchers Diet. Use the checker above to see how Weight Watchers Diet interacts with a specific drug.
How are Weight Watchers Diet interactions rated?
Each interaction is graded major, moderate, or minor based on how clinically significant it is and the strength of the evidence behind it. Major interactions are the most serious and are best avoided, or used only under close professional supervision.
Is it safe to take Weight Watchers Diet with my medications?
It depends on the specific medication. Some combinations are fine, while others call for monitoring, timing changes, or should be avoided. Check your exact drug above and confirm with your pharmacist or doctor before starting, stopping, or changing anything.
Where does this Weight Watchers Diet interaction information come from?
Our interaction data is built on the Natural Medicines database — an evidence-graded reference for vitamins, herbs, and supplements — and is reviewed by licensed HelloPharmacist pharmacists, who may add clinical context.
Is Weight Watchers a pill or supplement?
No. Weight Watchers (WW) is a structured eating and lifestyle program that uses a points system, food tracking, and support, not a pill or herbal supplement.
Does Weight Watchers actually work for weight loss?
Research suggests it can help many people lose a modest amount of weight and keep some of it off, especially with ongoing support and activity. Results vary, and weight may partly return if you stop following the plan.
Is Weight Watchers safe during pregnancy or breastfeeding?
Intentional weight loss is generally not recommended in pregnancy, and cutting calories while breastfeeding may affect milk supply. Talk with your doctor about appropriate nutrition during these times.
Are there any downsides to following Weight Watchers?
Some people feel hungry, tired, or stressed about tracking food, especially at first. People with a history of disordered eating or certain medical conditions should check with a clinician before starting.

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

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