Weight Loss Pills vs Injections: Foundayo, Mounjaro and Wegovy
Mounjaro and Wegovy injections are taken weekly; Foundayo and Wegovy tablets are taken daily. Tablets avoid needles, while injections need appropriate storage and sharps disposal. Foundayo has no fasting requirement; Wegovy tablets have specific fasting, water and waiting instructions. The trials below show results for particular medicines and doses, not proof that one format is always better. Suitability, side effects and a routine you can follow all matter.
| Mounjaro | Wegovy Injection | Foundayo | Wegovy Pill | |
|---|---|---|---|---|
| Manufacturer | Eli Lilly | Novo Nordisk | Eli Lilly | Novo Nordisk |
| Format | Weekly injection | Weekly injection | Daily tablet | Daily tablet |
| Active ingredient | Tirzepatide | Semaglutide | Orforglipron | Semaglutide |
| Average weight loss: overall trial analysis | 20.9% (15 mg; 72 weeks) | 14.9% (2.4 mg; 68 weeks, STEP 1); 18.7% (7.2 mg; 72 weeks, STEP UP) | 11.2% (36 mg trial capsule, equivalent to 17.2 mg tablet; 72 weeks) | 13.6% (25 mg; 64 weeks) |
| UK status | Available now | Available now | Available now | Available now |
The table uses treatment-regimen or treatment-policy analyses, which include the effects of stopping treatment: SURMOUNT-1, STEP 1, STEP UP, ATTAIN-1 and OASIS 4. Estimates assuming treatment continued are different: examples include 12.4% for Foundayo, 16.6% for Wegovy tablets and 22.5% for Mounjaro. These are separate trials in adults without type 2 diabetes, with different populations, durations and analysis methods. They cannot establish which medicine will work better for an individual. All treatments were studied alongside diet and physical activity. For a closer look at the semaglutide and tirzepatide options, our weight loss drugs comparison covers Mounjaro, Wegovy injections and the Wegovy pill.
What Injections Actually InvolveMounjaro and the Wegovy injection are administered once weekly using a pre-filled pen. Follow the instructions for your supplied pen and ask the pharmacy to demonstrate the technique if needed. The abdomen, thigh and upper arm are approved injection sites; rotate sites as instructed.
- Pens must be refrigerated before first use, then can typically be kept at room temperature for a defined period afterwards
- Only one weekly administration to remember, compared with seven weekly doses for a daily tablet
- Requires proper sharps disposal, which needs a small amount of planning (a sharps bin, and knowing your local disposal options)
- No timing restrictions around food — injections can be given at any time of day, regardless of meals
Foundayo and the Wegovy pill are both taken once daily, which means considerably more individual doses to remember over a year, but no needles, no sharps disposal, and far simpler storage and travel.
- No refrigeration is required, but keep tablets in their original packaging and follow the storage instructions in the leaflet
- No needle phobia to navigate, which matters more than it might sound for a genuinely significant number of people who avoid or delay treatment specifically because of injection anxiety
- Foundayo has no food or water restriction. Take the Wegovy pill after at least 8 hours without food, swallow it whole with no more than 120 mL of water, then wait at least 30 minutes before food, drink or other oral medicines.
- Missed-dose instructions differ by medicine. Check your leaflet or ask the pharmacy; a missed injection does not always mean waiting a full week
The medicine, formulation, dose and your ability to follow the prescribed routine all affect treatment. Mounjaro acts at both GIP and GLP-1 receptors; the other medicines listed act at GLP-1 receptors. Separate trial averages cannot isolate a tablet-versus-injection effect. Choose with your prescriber using your medical history, treatment response and practical preferences.
Worth knowing
Higher or lower results in separate trials should not be treated as a ranking of delivery formats. Even studies of the same ingredient can differ in dose, population, duration and handling of treatment discontinuation.
If you are considering moving from Mounjaro or another injection to a tablet, a change needs a prescriber-led plan: the starting dose and timing depend on your current medicine, dose, response and side effects. Do not overlap treatments or calculate your own equivalent dose. For example, the UK Wegovy tablet information includes a prescriber-led switch from 2.4 mg weekly injections to 25 mg daily tablets one week later. That is not a general conversion rule for other doses or medicines. ATTAIN-MAINTAIN studied selected patients who had completed an injection trial. Switching to orforglipron preserved more of their earlier weight loss than switching to placebo, but some weight regain occurred. This does not guarantee that someone switching in routine care will keep all their previous weight loss.
Important
Do not take these weight-loss tablets and injections together or change treatment without your prescriber. A switching plan needs to specify the last dose, the next medicine, its starting dose and when to take it.
An injection may suit you if…
- You'd rather deal with treatment once a week than think about it every day
- You're comfortable with self-injecting, or willing to learn
- Your prescriber considers an injectable treatment appropriate for your medical history and goals
A tablet may suit you if…
- You have needle anxiety, or would simply prefer never to self-inject
- You travel frequently and want to avoid managing cold-chain storage and sharps disposal on the road
- A consistent daily routine works better for you than a weekly one
- You specifically want to avoid any fasting window — in which case Foundayo is the tablet option here without food or water restrictions
All four medicines are used alongside a reduced-calorie diet and increased physical activity. Your response also depends on the treatment, dose, tolerability and whether you can follow the prescribed routine. Discuss these together with cost and practical preferences, rather than choosing solely from headline trial percentages.
Cost ConsiderationsFoundayo pill prices range from £94.49 on subscription or £104.99 as a single purchase at 0.8 mg, to £175.49 or £194.99 respectively at 17.2 mg. Each pack contains 30 tablets for 30 days of once-daily treatment.
Wegovy pill prices start at £98.99 on subscription or £109.99 as a single purchase for 1.5 mg. The 25 mg pack costs £175.49 or £194.99 respectively. Each pack contains 30 tablets for 30 days of once-daily treatment.
Mounjaro prices start at £134.99 on subscription or £149.99 as a single purchase for 2.5 mg. The 15 mg pen costs £287.99 or £319.99 respectively. Each pen contains four weekly doses for 28 days of treatment.
Wegovy injection prices start at £89.99 on subscription or £99.99 as a single purchase for 0.25 mg. The 2.4 mg pack costs £188.99 or £209.99, and the 7.2 mg pack costs £233.99 or £259.99 respectively. Each pack covers 28 days; the 7.2 mg pack contains four single-use pens.
Happy Pharmacy prices checked 1 October 2026 and subject to change. Compare the same purchase option and pack duration, and check delivery options and any charges at checkout. Consultation is free. The doses shown illustrate pricing; your prescriber decides which medicine and dose are suitable. Twelve 30-day tablet packs cover 360 days; thirteen 28-day injection packs cover 364 days.
See our weight loss medications overview for information on the oral and injectable options discussed here.
Four Treatments, One Consultation
Whether you're drawn to a pill or comfortable with a weekly injection, our GPhC-registered pharmacy team can talk you through every currently available option and assess whether Foundayo or another treatment is suitable for you.
Start Your Free Online Consultation →Read about treatment formats, listed prices and the assessment process at Happy Pharmacy. A prescriber will assess whether any treatment is suitable for you.
Weight loss medicationsUse code SWITCH10 if you're switching from another providerHappy Pharmacy is a GPhC-registered pharmacy (No. 9012585) — Superintendent Pharmacist: Palvinder Deol — Rated 4.8★ Excellent on Trustpilot
Sources checked 1 October 2026.
- Foundayo UK prescribing information
- Wegovy tablets UK prescribing information
- Mounjaro KwikPen UK prescribing information
- Wegovy injections UK prescribing information (including STEP UP)
- ATTAIN-1: original trial publication
- SURMOUNT-1: original trial publication
- ATTAIN-MAINTAIN: Lilly results and study design