You do not need a science degree to understand them, though. At Weight Medics, we believe people make better decisions when they truly understand what they are taking. So in this guide, we skip the jargon and explain what each medicine is, how it works, and what the differences actually mean for you.

First, What Does GLP 1 Mean?

GLP 1 stands for glucagon like peptide 1. It is a hormone your gut releases naturally after you eat. Think of it as a messenger that tells your brain, “That is enough food for now.”

It does three useful things. It makes you feel full, it slows down how quickly your stomach empties, and it helps your body manage blood sugar. The trouble is that natural GLP 1 only lasts a couple of minutes before your body clears it away.

Semaglutide and orforglipron are both GLP 1 receptor agonists. In plain English, they are lookalikes that switch on the same “I am full” signal, but they last much longer. The result is a quieter appetite, fewer cravings, and smaller portions that still feel satisfying.

Semaglutide: The Well Known Veteran

Semaglutide is made by Novo Nordisk. You may know it by several brand names. Ozempic and Rybelsus use it to treat type 2 diabetes, while Wegovy uses it for weight loss.

Chemically, semaglutide is a peptide, a short chain of building blocks similar to a tiny protein. It closely resembles your body’s own GLP 1 but has been tweaked to last around a week in the bloodstream. That long life is why the Wegovy pen only needs one injection a week.

Because it is a peptide, semaglutide is easily broken down in the stomach. The Wegovy pill gets around this with a special ingredient that helps it absorb, but only if you take it on an empty stomach with a sip of water and wait 30 minutes before eating or drinking.

Semaglutide’s biggest strength is its track record. It has been used by millions of people for years, and the Wegovy injection has also been shown to lower the risk of heart attack and stroke in people with existing heart disease.

Orforglipron: The New Arrival

Orforglipron was originally discovered by Chugai Pharmaceutical and developed by Eli Lilly, the company behind Mounjaro. It is sold as Foundayo and was approved in the UK in August 2026 for weight loss, keeping weight off, and type 2 diabetes.

The key difference is its build. Orforglipron is not a peptide at all. It is a small molecule, much more like a familiar everyday tablet. It does not look like GLP 1, yet it fits the same receptor, a bit like a different key that still opens the same lock.

Small molecules are tough. They survive the stomach and are absorbed easily, whether you have just eaten or not. That is why Foundayo can be taken at any time of day, with or without food, and with as much water as you like. They are also simpler to make in large quantities than peptides, which may help with supply and cost over time.

Side by Side: The Key Differences

So what does this mean in practice? Semaglutide gives you a choice between a pen and a pill, plus the reassurance of a long history. Orforglipron gives you a tablet that fits around your life, with no fasting or timing rules.

If you are mainly weighing up Daily Weight Loss Tablets, the real question is whether you can stick to the Wegovy pill’s morning routine or would rather have Foundayo’s freedom.

Results and Side Effects, Without the Jargon

In clinical trials, people taking the Wegovy pen lost around 15% of their body weight on average, and those on the Wegovy pill lost 13.6% over 64 weeks. People on the highest dose of Foundayo lost around 11% to 12% over 72 weeks. For someone weighing 100kg, that is roughly 11kg to 15kg depending on the treatment.

These are averages, and no trial has yet compared the two medicines directly. Some people do much better than average, and others less so. For a detailed breakdown by dose, read our guide to Foundayo weight loss results.

Because both medicines flip the same switch, their side effects are similar. Nausea, diarrhoea, constipation, and indigestion are the most common, especially in the early weeks or after a dose increase. Most people find these settle with time, smaller meals, and eating more slowly.

Which One Is Right for You?

Semaglutide may suit you if you want the strongest results available in a pill or pen, value a long safety record, or have heart disease and could benefit from the extra heart protection seen with the Wegovy injection.

Orforglipron may suit you if you want a simple tablet with no rules, have an unpredictable routine, dislike needles, or have type 2 diabetes alongside your weight.

These are not the only options, either. If you want the biggest average weight loss, weekly Mounjaro and Wegovy injections remain the most powerful choices. Some people prefer short term appetite suppressants instead, such as Phentermine & Diethylpropion Tablets UK, which work in a different way altogether.

To be eligible for Wegovy or Foundayo, you will usually need a BMI of 30 or above, or between 27 and 30 with a weight related health condition. Both are currently available in the UK through private prescription.

Frequently Asked Questions

Are semaglutide and orforglipron the same thing?

No. They are different medicines made by different companies. They both act on the GLP 1 receptor, but semaglutide is a peptide and orforglipron is a small molecule.

Is Ozempic the same as Wegovy?

Both contain semaglutide, but Ozempic is licensed for type 2 diabetes and Wegovy is licensed for weight loss, with different doses.

Is orforglipron the same as Mounjaro?

No. Both are made by Eli Lilly, but Mounjaro contains tirzepatide, an injection that acts on two hormones. Orforglipron is a tablet that acts on GLP 1 only.

Which medicine works faster?

Both start at a low dose and increase gradually, so weight loss builds steadily over several months with either one.

Is orforglipron safe if it is so new?

It went through large clinical trials before approval, and the MHRA keeps all GLP 1 medicines under close review. Your prescriber will check whether it suits your health history.

Can I switch between the two?

Often, yes. A clinician can guide you on the right dose and timing if you want to change.

The Bottom Line

Strip away the long names and the picture is simple. Semaglutide is the proven veteran: a peptide that comes as a weekly pen or a carefully timed daily pill, with slightly stronger average results. Orforglipron is the flexible newcomer: a sturdy small molecule tablet you can take whenever suits you.

Both switch on the same “I am full” signal. The best choice depends on your goals, your health, and your daily routine. A conversation with a qualified clinician is the easiest way to work out which one fits you.