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Citations

All price data on Penzilla is sourced from monj.co.uk, igovy.co.uk, ogovy.co.uk and dayo.co.uk. Clinical facts come from the regulators, licences and trials listed below.

Price data

A live list, rebuilt every 12 hours

Penzilla is the UK's only constantly updated live price list covering Mounjaro, Wegovy, Wegovy tablets and Foundayo on one page. Twice a day the site pulls the newest price record from each source and rebuilds every table. If a source cannot be reached, the last good record stays in place with its date.

Discount codes and offer links

Every code and offer link comes from the same four sites. Offers were last checked on 8 October 2026. Each offer panel shows this date.

Pharmacy registration

GPhC numbers come from the General Pharmaceutical Council register. Each registration certificate is checked manually.

Clinical sources

1. General Pharmaceutical Council, register of pharmacies
2. General Pharmaceutical Council, inspection reports
3. MHRA, Yellow Card reporting site
4. MHRA Drug Safety Update, GLP-1 and dual GLP-1/GIP receptor agonists: strengthened warnings on acute pancreatitis, 29 January 2026
5. NICE technology appraisal TA1026, Tirzepatide for managing overweight and obesity, December 2024
6. NICE technology appraisal TA875, Semaglutide for managing overweight and obesity
7. Jastreboff AM and colleagues, SURMOUNT-1, New England Journal of Medicine, 2022
8. Aronne LJ and colleagues, SURMOUNT-4, JAMA, 2024
9. Aronne LJ and colleagues, SURMOUNT-5, New England Journal of Medicine, 2025
10. Wilding JPH and colleagues, STEP 1, New England Journal of Medicine, 2021
11. Wilding JPH and colleagues, STEP 1 trial extension, Diabetes, Obesity and Metabolism, 2022
12. Lincoff AM and colleagues, SELECT, New England Journal of Medicine, 2023
13. Rubino DM and colleagues, STEP 8, JAMA, 2022
14. Pi-Sunyer X and colleagues, SCALE Obesity and Prediabetes, New England Journal of Medicine, 2015
15. Wharton S and colleagues, OASIS 4, New England Journal of Medicine, 2025
16. The Pharmaceutical Journal (Royal Pharmaceutical Society), MHRA approves orforglipron weight-loss pill, August 2026
17. The Pharmaceutical Journal (Royal Pharmaceutical Society), Higher-dose Wegovy could increase patient expectation, warns PDA, January 2026
18. NHS Cheshire and Merseyside, Tirzepatide (Mounjaro) for obesity: information for patients from 1 April 2026
19. NHS, Obesity: treatment
20. NHS, Calculate your body mass index
21. Eli Lilly, Mounjaro KwikPen Summary of Product Characteristics (electronic medicines compendium)
22. Novo Nordisk, Wegovy Summary of Product Characteristics (electronic medicines compendium)
23. Novo Nordisk, Saxenda Summary of Product Characteristics (electronic medicines compendium)
24. Cheplapharm, Xenical 120mg Summary of Product Characteristics (electronic medicines compendium)
25. General Pharmaceutical Council, guidance for pharmacies providing services at a distance, including on the internet, February 2025
26. Eli Lilly medical information, Should clicks be counted when setting a dose on the Mounjaro KwikPen?
27. Institute for Safe Medication Practices, Errors possible when microdosing (counting clicks) to dose weight loss medicines

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