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ObesityPILLARNCT07055607

A Two-year Prospective, Observational Study of Wegovy in Real-world Clinical Practice

An observational study of Obesity, run by Novo Nordisk A/S at 30 sites in 3 countries.

Enrolling by invitation

Enrolling by invitation. The study team selects and invites participants, usually from an existing group of patients.

Sites and contacts
Official record
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Trial summary

This observational study will explore how Wegovy® (Semaglutide) is used in everyday situations, how it might affect things like weight, body mass index (BMI) and waist circumference, and what kind of impact it could have on overall quality of life. Read more about this study

Who is it for?
Ages 18 years and older
Conditions the study is for
Obesity
What is being tested?
Semaglutide
How many people
1,250 participants
Where
30 sitesin 3 countries
Study dates
1 May 2025to 15 Aug 2028
Phase
Observational
Are there results?
Not yet: the study is under way

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 years and older
  • All sexes
  • No healthy volunteers
  • Adult, Older adult

Study population: Participants will be treated with Wegovy according to the local labels in Spain, Switzerland and the United Kingdom (UK).

Who may be able to join

  • Signed consent obtained before any study-related activities (study-related activities are any pro-cedure related to recording of data according to the protocol).
  • Are eligible for Wegovy and are due to initiate treatment for the first time within the study period; the decision to initiate treatment with commercially available Wegovy has been made by the patient/Legally Acceptable Representative (LAR) and the treating physician before and independently from the decision to include the patient in this study.
  • Male or female, age above or equal to 18 years at time of signing informed consent.
  • Have at least one reported weight measurement documented at baseline or within 28 days prior to baseline.
  • Participants must be able to complete the electronic patient reported outcome (ePRO) questionnaires on a compatible electronic device with internet access.
  • Fulfil the respective reimbursement criteria in the visit prior to / at baseline in Switzerland and United Kingdom (UK).

Who cannot join

  • Previous participation in this study. Participation is defined as having given informed consent in this study.
  • Presence of a documented refusal or unwillingness to participate in research.
  • Previous treatment with other obesity management pharmacotherapy or any glucagon like pep-tide-1 (GLP- 1) receptor agonist up to 90 days prior to baseline in Switzerland and UK.
  • Previous treatment with other obesity management pharmacotherapy or any GLP- 1 receptor agonist up to 30 days prior to baseline in Spain.
  • Pregnant or women of childbearing potential and not using a highly effective contraceptive method.
  • Mental incapacity, unwillingness or language barriers precluding adequate understanding or cooperation with the study requirements.
Show all 12Show fewer
  • Individuals who have reported plans to move out in the next 12 months to an area not serviced by their current site.
  • Personal or family history of medullary thyroid carcinoma (MTC) or Multiple Endocrine Neoplasia syndrome type 2 (MEN 2) in Spain and UK.
  • Participant has had a prior serious allergic reaction to semaglutide or any of the ingredients in Wegovy.
  • Have had Saxenda reimbursed by basic mandatory health insurance for a cumulative period of more than 12 months prior to baseline in Switzerland.
  • Documented history of diabetes mellitus type 1 and type 2 in Spain.
  • Presence of diabetic complications and/or at risk of hypoglycaemia (with a documented history of frequent hypoglycaemia) in Spain.

Trial locations and contacts

30 sites in 3 countries. Contact the study team or a site near you to ask about taking part.

30 sites in 3 countries

Spain15 sites
  • CAP Sarrià

    Barcelona, 08017

  • CAP Sants

    Barcelona, 08028

  • Hospital Vall d'Hebron

    Barcelona, 08035

  • Centro de Salud Cartagena Casco Antiguo

    Cartagena, 30201

  • Hospital Vithas Sevilla

    Castilleja de la Cuesta, 41950

  • Hospital Univ. Virgen de la Arrixaca

    El Palmar (Murcia), 30120

  • Clínica de Endocrinología y Nutrición Dr. Bellido

    Ferrol, 15401

  • Ginegetafe S.L.

    Getafe (Madrid), 28901

  • Centro de Salud La Cuesta

    La Cuesta (Santa Cruz de Tenerife), 38320

  • Hospital Univ. de Gran Canaria Doctor Negrín

    Las Palmas de Gran Canaria, 35010

  • Hospital Universitario Sanitas Virgen del Mar

    Madrid, 28016

  • Hospital Quirónsalud Málaga

    Málaga, 29004

  • Hospital Univ. Central de Asturias

    Oviedo, 33011

  • Hospital Son Espases

    Palma de Mallorca, 07120

  • Hospiten Roca_Ginecología

    San Bartolomé de Tirajana (Las Palmas), 35100

Other trials in Spain

Switzerland9 sites
  • Praxis Dr. Schäfer, Bern

    Bern, 3013

  • Hôpitaux Universitaires de Genève HUG

    Geneva, 1211

  • Luzerner Kantonsspital

    Lucerne, 6004

  • Clinica Moncucco

    Lugano, 6900

  • Centre médical de l'obésité et du diabète

    Neuchâtel, 2000

  • Kantonsspital Olten

    Olten, 4600

  • Praxis Prof. Dr. med. G. Rudofsky

    Olten, 4600

  • Stoffwechselzentrum St. Gallen

    Sankt Gallen, 9016

  • Universitätsspital Zürich

    Zurich, 8091

Other trials in Switzerland

United Kingdom6 sites
  • Barnsley Hospital

    Barnsley, S75 2EP

  • Hull Royal Infirmary

    Hull, HU3 2JZ

  • St Thomas' Hospital - Diabetes

    London, SE1 7EH

  • Luton and Dunstable University Hospital

    Luton, LU4 0DZ

  • St George's Hospital

    Tooting, SW17 0RE

  • Sandwell Health Campus

    West Bromwich, West Midlands, B71 4HJ

Other trials in United Kingdom

About this study

This observational study will explore how Wegovy® (Semaglutide) is used in everyday situations, how it might affect things like weight, body mass index (BMI) and waist circumference, and what kind of impact it could have on overall quality of life. The overall purpose of this study is to understand how Wegovy impacts weight when used as part of regular medical care. Participants will be treated with Wegovy as prescribed to the participant by their doctor, in accordance with normal clinical practice. The study will last for about two years.

Conditions
Obesity
Being tested
Semaglutide
Medical subject headings
Obesity

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • SemaglutideDrug

    Also called Wegovy®

    Participants will be treated with commercially available Wegovy according to routine clinical practice and is purely at the discretion of the treating physician. Only individuals receiving Wegovy reimbursed by the healthcare system in their respective countries are included in the study.

Study groups in NCT07055607
Study groupRoleWhat they receive
Wegovy®Participants will be treated with Wegovy according to the local labels in Spain, Switzerland and the United Kingdom (UK).
Receives: Drug: Semaglutide

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Absolute change in body weight (kilograms [kg])

    Measured in kg.

    Measured: From baseline (0 months) to the end of observation (24 months)

  2. Percentage change in body weight (percentage [%])

    Measured in %.

    Measured: From baseline (0 months) to the end of observation (24 months)

Secondary outcomes (45)
  1. Absolute change in waist circumference (centimeters [cm])

    Measured in cm.

    Measured: From baseline (0 months) to the end of observation (24 months)

  2. Absolute change in waist-to-height ratio

    Measured as ratio.

    Measured: From baseline (0 months) to the end of observation (24 months)

  3. Percentage change in waist circumference (%)

    Measured in %.

    Measured: From baseline (0 months) to the end of observation (24 months)

  4. Number of participants who achieve greater than or equal to (>=) 5 percent body weight reduction (Yes/No)

    Measured as count of participants.

    Measured: From baseline (0 months) to the end of observation (24 months)

  5. For Switzerland: Number of participants who achieve >=7 percent body weight reduction (Yes/No)

    Measured as count of participants.

    Measured: From baseline (0 months) to the end of observation (22 months)

  6. Number of participants who achieve >=10 percent body weight reduction (Yes/No)

    Measured as count of participants.

    Measured: From baseline (0 months) to the end of observation (24 months)

  7. For Switzerland: Number of participants who achieve >=12 percent body weight reduction (Yes/No)

    Measured as count of participants.

    Measured: From baseline (0 months) to the end of observation (22 months)

  8. Number of participants who achieve >=15 percent body weight reduction (Yes/No)

    Measured as count of participants.

    Measured: From baseline (0 months) to the end of observation (24 months)

  9. Number of participants who achieve >=20 percent body weight reduction (Yes/No)

    Measured as count of participants.

    Measured: From baseline (0 months) to the end of observation (24 months)

  10. Change in percentage of participant in each Body Mass Index (BMI) category

    Measured as count of participants.

    Measured: From baseline (0 months) to the end of observation (24 months)

  11. Change in High Density Lipoprotein (HDL) Cholesterol (milligrams per decilitre [mg/dL])

    Measured in mg/dL.

    Measured: From baseline (0 months) to the end of observation (24 months)

  12. Change in HDL Cholesterol (millimoles per litre [mmol/L])

    Measured in mmol/L.

    Measured: From baseline (0 months) to the end of observation (24 months)

  13. Change in Low Density Lipoprotein (LDL) Cholesterol (mg/dL)

    Measured in mg/dL.

    Measured: From baseline (0 months) to the end of observation (24 months)

  14. Change in LDL Cholesterol (mmol/L)

    Measured in mmol/L.

    Measured: From baseline (0 months) to the end of observation (24 months)

  15. Change in Very Low Density Lipoprotein (VLDL) Cholesterol (mg/dL)

    Measured in mg/dL.

    Measured: From baseline (0 months) to the end of observation (24 months)

  16. Change in VLDL Cholesterol (mmol/L)

    Measured in mmol/L.

    Measured: From baseline (0 months) to the end of observation (24 months)

  17. Change in Free Fatty Acid (FFA) (mmol/L)

    Measured in mmol/L.

    Measured: From baseline (0 months) to the end of observation (24 months)

  18. Change in Triglycerides (mg/dL)

    Measured in mg/dL.

    Measured: From baseline (0 months) to the end of observation (24 months)

  19. Change in Triglycerides (mmol/L)

    Measured in mmol/L.

    Measured: From baseline (0 months) to the end of observation (24 months)

  20. Change in Glycated Haemoglobin (HbA1c) (%)

    Measured in %.

    Measured: From baseline (0 months) to the end of observation (24 months)

  21. Change in systolic blood pressure

    Measured in millimeter of mercury (mmHg).

    Measured: From baseline (0 months) to the end of observation (24 months)

  22. Change in diastolic blood pressure

    Measured in mmHg.

    Measured: From baseline (0 months) to the end of observation (24 months)

  23. Percentage change in the prevalence of obesity-related conditions

    Obesity-related conditions will be assessed as Yes/No in the following categories: Myocardial infarction (MI), Stroke, Heart failure with reduced Ejection Fraction (HFrEF) and Heart Failure with preserved Ejection Fraction (HFpEF), Atherosclerotic cardiovascular disease (ASCVD) defined as at least one of coronary artery disease, peripheral artery disease, cerebrovascular disease and atherosclerosis, Metabolic dysfunction-associated steatotic liver disease (MASLD), Metabolic dysfunction-associated steatohepatitis (MASH), Chronic kidney disease (CKD), Obstructive sleep apnoea, Poly-cystic ovary syndrome (PCOS), Infertility, Urinary incontinence, Lower back pain, Knee / hip oste-oarthritis, Musculoskeletal pain, Asthma, Chronic Obstructive Pulmonary Disease (COPD), Clini-cian-diagnosed mood disorder, Clinician-diagnosed eating disorder.

    Measured: From baseline (0 months) to the end of observation (24 months)

  24. Percentage change in the total daily dosage of concomitant drugs (Yes/No)

    Total daily dosage of concomitant drugs were assessed as Yes/No among the following: Antidiabetic medication, Antihypertensive medication, Lipid-lowering medication, Pain medica-tion, Psychotropic medication, Antithrombotic agents, Thyroid hormone medication, Proton pump inhibitor.

    Measured: From baseline (0 months) to the end of observation (24 months)

  25. Percentage change in the usage of additional treatments for weight loss (Yes/No)

    Usage of additional treatments for weight loss will be assessed as Yes/No among the following: Bariatric surgery, Clinical practice / healthcare-provided diet plan, Alternative diet plan, Exercise regime, Behavioural and alternative therapy, Digital health app.

    Measured: From baseline (0 months) to the end of observation (24 months)

  26. Median time to Wegovy® maintenance dose

    Measured in weeks.

    Measured: From baseline to the date of reported maintenance dose during the observation period (24 months)

  27. Median time to each Wegovy® dose escalation

    Measured in weeks.

    Measured: Date from the start of the previous dose to the date of each subsequent escalation during the observation period (24 months)

  28. Maximum dose of Wegovy® for weight management

    Measured in milligrams (mg).

    Measured: After baseline to any given time during the observation period (24 months)

  29. For UK and Spain: Change in percentage of participants on Wegovy® with each of drug-related adverse reaction

    Measured as percentage of participants.

    Measured: From baseline (0 months) to the end of observation (24 months)

  30. Median persistence time of Wegovy® treatment

    Measured in weeks.

    Measured: From baseline (0 months) to the end of observation (24 months)

  31. Change in percentage of participants who discontinued

    Measured as percentage of participants.

    Measured: From baseline (0 months) to the end of observation (24 months)

  32. Percentage of participants who discontinued/withdrawn

    Measured as percentage of participants. Reason for discountinued/withdrawn due to Lack of efficacy as per reimbursement criteria (UK, CH only), Lack of efficacy as per clinical judgment, Lack of efficacy as per subject's judgment, Non-serious gastro intestinal event (nausea, vomiting, diarrhea, constipation and/or abdominal pain), Adverse reaction ((AR) not otherwise specified in the listed reasons), Patient's request, Pregnancy,Financial constraints (cost of medication, change in eligibility for reimbursement) (CH and ES only), Reaching a BMI of less than (<) 25 kilograms per meter square (kg/m^2), death and other.

    Measured: From baseline (0 months) to the end of observation (24 months)

  33. For Switzerland: Percentage of participants who continued under reimbursement by basic mandatory health insurance (Yes/No)

    Measured as percentage of participants.

    Measured: From baseline (0 months) to the end of observation (22 months)

  34. For Switzerland: Percentage of participants who switched to out-of-pocket payment (or any other arrangement) (Yes/No)

    Measured as percentage of participants.

    Measured: From baseline (0 months) to the end of observation (22 months)

  35. For Switzerland: Percentage of participants who stopped treatment (Yes/No)

    Measured as percentage of participants.

    Measured: From baseline (0 months) to the end of observation (22 months)

  36. For Spain: Percentage of participants who have continued under out-of-pocket payment (Yes/No)

    Measured as percentage of participants.

    Measured: From baseline (0 months) to the end of observation (12 months)

  37. For Spain: Percentage of participants who have switched to reimbursement by the Public Health System (Yes/No)

    Measured as percentage of participants.

    Measured: From baseline (0 months) to the end of observation (12 months)

  38. For Switzerland: Change in percentage of participants fulfilling the necessary weight loss reimbursement criteria

    Measured as percentage of participants.

    Measured: From baseline (0 months) to the end of observation (22 months)

  39. Absolute change in the EuroQoL-5-Dimension (5-Level) (EQ-5D-5L)

    EQ-5D-5L consists of 2 components, EQ-5D descriptive system and EQ visual analogue scale (EQ-VAS). EQ-5D 5L descriptive system comprises of 5 dimensions: mobility, self-care, usual activities, pain/discomfort and anxiety/depression. Each dimension will have 5 levels: no, slight, moderate, severe and extreme problems. Respondent is asked to indicate the health state by ticking the box next to the most appropriate statement in each of the five dimensions. Decision will result in a 1-digit number that expresses the level for that dimension. Digits for five dimensions can be combined into a 5-digit number that describes patient's health state. EQ-5D health states can be converted into a single summary number (index value) which will reflect how good/bad a health state is according to valuation set in general population of a country/region. Index score records an average health status according to dimensions using an algorithm,ranges 0-1 with higher score indicating better health status.

    Measured: From baseline (0 months) to the end of observation (24 months)

  40. Absolute change in the EQ Visual Analogue Score (EQ-VAS)

    Measured as score points. The EQ-VAS will record the respondent's self-rated health on a vertical visual analogue scale. The scale is numbered from 0 to 100, with lower score indicating worst health and higher score indicating best health.

    Measured: From baseline (0 months) to the end of observation (24 months)

  41. Absolute change in the Adelphi Adherence Questionnaire (ADAQ) score

    Measured as score points. ADAQ is an 11-item instrument that measures adherence to medication. The instrument includes 4 items that assess adherence behaviours and 7 items that assess drivers of non adherence. Each item yields a score ranging from 0 to 4 and item scores are then averaged to produce the ADAQ score. The ADAQ score is a measure of medication adherence ranging from 0 to 4, with lower scores representing greater adherence.

    Measured: From baseline (0 months) to the end of observation (24 months)

  42. Absolute change in treatment satisfaction questionnaire for medication 9 (TSQM-9) domain scores

    Measured as score points. TSQM-9 is a 9-item instrument that measures a patient's satisfaction with their medication. The instrument assesses three domains: effectiveness, convenience and global satisfaction. Each domain will produce a score ranging from 0 to 100, with higher scores reflecting higher satisfaction on that domain.

    Measured: From baseline (0 months) to the end of observation (24 months)

  43. Absolute change in percentage of work time missed (absenteeism) due to weight problem using Work Productivity and Activity Impairment Questionnaire (WPAI)

    Measured as score points. WPAI is a self-administered instrument used to assess the impact of disease on work productivity and regular activities during the past seven days. WPAI outcomes are expressed as impairment percentages (0-100), with higher numbers indicating greater impairment and less productivity, that is, worse outcomes.

    Measured: From baseline (0 months) to the end of observation (24 months)

  44. Absolute change in percentage of time impaired while working (presenteeism) due to weight problem using WPAI

    Measured as score points. WPAI is a self-administered instrument used to assess the impact of disease on work productivity and regular activities during the past seven days. WPAI outcomes are expressed as impairment percentages (0-100), with higher numbers indicating greater impairment and less productivity, that is, worse outcomes.

    Measured: From baseline (0 months) to the end of observation (24 months)

  45. Absolute change in percentage of activity impairment due to weight problem using WPAI

    Measured as score points. WPAI is a self-administered instrument used to assess the impact of disease on work productivity and regular activities during the past seven days. WPAI outcomes are expressed as impairment percentages (0-100), with higher numbers indicating greater impairment and less productivity, that is, worse outcomes.

    Measured: From baseline (0 months) to the end of observation (24 months)

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted9 Jul 2025
  2. Study start1 May 2025
  3. Primary completion15 Aug 2028 (estimated)
  4. Study completion15 Aug 2028 (estimated)

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Observational
Observational model
Case only
Time perspective
Prospective
Enrolment
1,250 participants (estimated)
IDs, dates and publications
ClinicalTrials.gov ID
NCT07055607
Sponsor's protocol ID
NN9536-8189
Other IDs
U1111-1308-1428
Acronym
PILLAR
Status last verified
Aug 2026
First submitted
13 Jun 2025
Last updated
4 Aug 2026
Results posted
No
Data monitoring committee
No
Individual data sharing
Yes: According to the Novo Nordisk disclosure commitment on novonordisk-trials.com.

Questions about this trial

What is this clinical trial studying?

An observational study of Obesity, run by Novo Nordisk A/S at 30 sites in 3 countries.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 6 inclusion and 12 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: enrolling by invitation, as of the sponsor's last update on 4 Aug 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 30 sites in Spain, Switzerland, United Kingdom. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

Are results available for this study?

This study is still under way. Results are not available in the source record yet.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Absolute change in body weight (kilograms [kg]) (time frame: From baseline (0 months) to the end of observation (24 months)). The study lists 2 primary outcomes in all. It is what the study was designed to measure, not a finding.

Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 4 Aug 2026.

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