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Weight · GLP-1 Programs

WegoSlim vs MounjaSlim: Choosing Your Doctor-Led Weight Program

Semaglutide and tirzepatide compared honestly — mechanism, results, side effects and fit.

Hori Medical TeamReviewed by Dr. Peerapol7 min readAug 2026

Quick answer

WegoSlim or MounjaSlim: how is the choice made?

WegoSlim uses a semaglutide-based plan, while MounjaSlim uses a tirzepatide-based plan. They act through different hormone pathways and are not chosen from average study results alone. A physician should first review the indication, medical history, contraindications, current medicines, previous response, side effects, access and follow-up needs. Neither programme guarantees a fixed amount or speed of weight loss.

Suitable for
Adults who meet prescribing criteria and can follow a physician-led titration and monitoring plan.
What to expect
Response varies with medicine, dose, tolerance, nutrition, activity and duration of treatment.
Risks
Gastrointestinal effects are common; contraindications, interactions and serious symptoms require medical review.
Downtime
No procedural downtime, although adjustment symptoms may affect meals, hydration and routine.
When to see a doctor
Before choosing or switching a programme, and promptly for persistent vomiting, dehydration or severe abdominal pain.
WegoSlim vs MounjaSlim at Hori Clinic Bangkok

Both of Hori's weight programs are weekly-injection GLP-1 plans run by a doctor — but they use different medicines. WegoSlim is built on semaglutide (a GLP-1 agonist); MounjaSlim on tirzepatide (a dual GIP + GLP-1 agonist). Here is how they differ in practice, without the hype.

Same family, different engines

Both medicines mimic gut hormones that regulate appetite: meals feel satisfying sooner, cravings quiet down, and eating naturally shrinks. Tirzepatide adds a second hormone pathway (GIP), which in head-to-head trials produced greater average weight loss than semaglutide — at a correspondingly higher price point.

What results to realistically expect

In clinical studies, semaglutide averaged roughly 10–15% body-weight reduction over a year-plus of consistent use; tirzepatide reached about 15–20% at higher doses. Individual results vary widely with dose, adherence, food habits and activity — the medicine opens the door; routine walks through it.

Side effects — similar for both

The common effects are digestive: nausea, fullness, constipation or reflux, mostly in the first weeks and during dose increases. Slow titration, smaller meals and hydration manage most of it. Serious effects are rare; screening (pancreatitis history, thyroid cancer family history, pregnancy) is done before starting either program.

Which program fits which person?

  • WegoSlim: budget-conscious start, moderate weight goal, or first GLP-1 experience
  • MounjaSlim: larger weight goal, previous semaglutide plateau, or prioritising maximum effect
  • Both: weekly self-injection with doctor follow-ups, dose titration and habit coaching
  • Neither: pregnancy, certain endocrine histories, or BMI/goals better served another way — screening decides

The short version

  • Same GLP-1 family; tirzepatide (MounjaSlim) averages more loss at a higher price.
  • Digestive side effects are common early and manageable with slow titration.
  • Doctor screening + follow-up is what separates a program from just buying a pen.

Frequently asked questions

Can I switch between the two programs?+

Yes — switching semaglutide ↔ tirzepatide is common (e.g. after a plateau). The doctor manages the transition dose safely.

Will the weight come back after stopping?+

Appetite returns when the medicine stops, so regain is possible without habit changes. Programs taper gradually and focus on eating routines you can keep — that is the real exit strategy.

How fast will I see results?+

Appetite changes within the first weeks; visible weight change typically from month 1–2, accelerating as the dose reaches its effective range.

Do I need to diet and exercise too?+

The medicine reduces hunger, but body composition and maintenance depend on protein intake, movement and sleep. Programs include this coaching for a reason.

Is buying pens online safe?+

Counterfeit and mis-stored pens are a real problem, and dosing without screening carries risk. A physician-run program exists precisely to remove those two dangers.

If you are comparing options

WegoSlim vs MounjaSlim at Hori Clinic Bangkok

Medical review

Dr. Peerapol Riawraengsattha (Dr. Lhong)

Anesthesiology · Aesthetic Medicine · Thai medical licence 58253

Sources used

Peer-reviewed literature on the underlying medications. GLP-1 medication is prescribed only after medical assessment; individual results and side effects vary. This page is educational and is not a treatment guarantee.

  1. Aronne LJ, Horn DB, le Roux CW, et al. Tirzepatide as Compared with Semaglutide for the Treatment of Obesity. N Engl J Med. 2025;393(1):26-36. doi:10.1056/NEJMoa2416394
  2. Moiz A, Filion KB, Toutounchi H, et al. Efficacy and Safety of Glucagon-Like Peptide-1 Receptor Agonists for Weight Loss Among Adults Without Diabetes: A Systematic Review of Randomized Controlled Trials. Ann Intern Med. 2025;178(2):199-217. doi:10.7326/ANNALS-24-01590

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