GLP-1 Tablets vs Injections

The key difference lies in how the medicine is formulated and taken.

GLP-1 tablets

GLP-1 tablets are taken by mouth. They are specifically formulated to help the medicine survive the digestive system and be absorbed through the stomach.

Injections

GLP-1 injections are given under the skin using a pre-filled pen. This route bypasses the digestive system and allows the medicine to be absorbed from the tissue under the skin into the circulation over time.

GLP-1 tablets

Once absorbed, it acts on GLP-1 receptors to reduce hunger, slow digestion, and support blood sugar control.

Injections

Injectable weight loss treatments do not all work on exactly the same receptors. Their mechanism depends on the active ingredient.

• Wegovy works by targeting the GLP-1 receptor only.
• Mounjaro acts on both GLP-1 and GIP receptors, which enhances appetite suppression and metabolic effects.
• Retatrutide goes even further by targeting GLP-1, GIP, and glucagon receptors.

Which has the better mechanism?

There is no single winner based purely on whether the medicine is a tablet or an injection. The mechanism is determined by the active ingredient, not the route of administration.

That said, current injectable options include medicines with broader receptor activity, such as Mounjaro and investigational retatrutide. This is one reason injections currently have the edge in weight loss results. However, tablets may still be highly effective when they are properly absorbed and taken consistently.

GLP-1 tablets

• Wegovy tablets typically start at 1.5mg once daily and increase to a maximum of 25mg.
• Foundayo is started at 0.8mg once daily, then increased to 2.5mg, then 5.5mg. It can then be increased further to 9mg, 14.5mg, or 17.2mg once daily.

Injections

Dosing depends on the specific medication.

• Wegovy injections start at 0.25mg once weekly and gradually increases up to 2.4mg weekly
• Mounjaro starts at 2.5mg once weekly and can increase up to 15 mg weekly depending on response and tolerance.
• Retatrutide typically starts at a low dose and is gradually increased over time, with clinical trial doses reaching up to 12mg weekly depending on response and tolerability.

Dosage Table

The key difference is how structured the routine is.

GLP-1 tablets

• Wegovy tablets must be taken first thing in the morning on an empty stomach. They should be swallowed whole with a small amount of water only, usually up to 120ml, and you should wait at least 30 minutes before eating, drinking or taking other oral medicines.
  Further reading: How to take Wegovy tablets
• Foundayo tablets are also taken once daily, but they are simpler to take. They can be taken with or without food and do not have the same fasting restrictions as Wegovy tablets. The tablet should still be swallowed whole and should not be broken, crushed or chewed.
  Further reading: How to take GLP-1 tablets

Injections

Injections are usually taken once weekly using a pre-filled pen. They are injected under the skin and can generally be taken at any time of day, with or without food.

This makes the weekly injection routine less dependent on mealtimes, morning schedules or other oral medicines.

Which is easier to take?

From a practical point of view, tablets feel simpler in the moment, but injections are often easier to stay consistent with long term.

Results table

Which gets better results?

Current and investigational injectable weight-loss options include dual- and triple-receptor medicines, which is why some injectable treatments have produced higher average weight loss in clinical trials. The difference is primarily driven by the medicine, dose and mechanism, not simply whether it is swallowed or injected.

This helps explain why some injectable medicines have produced greater average weight loss in clinical trials. The difference is primarily driven by the medicine, dose and mechanism rather than simply whether it is swallowed or injected.

Both tablets and injections in the GLP-1 class commonly share similar side effects. The most frequently reported include:

• Nausea
• Vomiting
• Diarrhoea
• Constipation
• Reduced appetite
• Bloating
• Stomach discomfort

The frequency and severity of side effects vary according to the individual medicine, dose and stage of dose escalation rather than simply whether the treatment is taken as a tablet or injection.

Injectable treatments can additionally cause injection-site reactions such as redness, itching or swelling.

Serious risks (for both)

Rare but important risks include pancreatitis, gallbladder problems, dehydration from severe vomiting/diarrhoea, and potential worsening of diabetic eye disease in people with diabetes. These are uncommon but require medical attention if symptoms occur.

Which has fewer side effects?

Neither route can be said to consistently cause fewer side effects. The side-effect profile depends more on the specific medicine and dose. Both oral and injectable GLP-1-based treatments commonly cause gastrointestinal side effects, while injections can additionally cause injection-site reactions.

GLP-1 tablets

Wegovy tablets

Prices start from £88.99 per month

Foundayo tablets

Prices start from £84.99 per month.

Injections

Wegovy

Chemist Click pricing is:

Mounjaro

Chemist Click pricing is:

Retatrutide

• Still in clinical trials, no approved pricing.

Further reading: Where to buy retatrutide

Which is cheaper?

At present, tablets are not commercially priced for weight-loss use, so injections are the only real-cost option on the market, with Wegovy generally being slightly cheaper than Mounjaro in private UK pricing.

GLP-1 tablets

Both Foundayo and Wegovy tablets are available in the UK.

Injections

Both Wegovy and Mounjaro are available in the UK. Retatrutide is undergoing clinical trials and is not available. 

GLP-1 tablets may be better for you if:

• You want to use a familiar tablet
• You do not want to use needles
• You travel frequently
• You prefer routine daily habits

Injections may be better for you if:

• You want reliable absorption and consistent drug delivery
• You want once-weekly dosing
• You’re looking for stronger average weight-loss results
• You don’t want your meds to be affected by food, timing, or stomach conditions