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.
• Orforglipron 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 injection starts 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
• Orforglipron 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.

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.

GLP-1 Tablets

Injections

Results table

Which gets better results?

Overall, injections tend to produce the greatest average weight loss in clinical trials because they act on multiple hormone pathways.

GLP-1 only treatments and oral options still deliver strong results but typically show slightly lower average weight loss because they target a single receptor pathway.

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

GLP-1 tablets

Side effects of GLP-1 tablets are predominantly stomach related, including nausea or upper abdominal discomfort, partly because the medication passes through the digestive system before being absorbed.

Injections

Injections are more likely to cause injection-site reactions such as redness, itching, or mild swelling. Some people also report slightly stronger initial nausea when starting or increasing doses, as the medication enters the bloodstream more directly.

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 clearly has fewer side effects overall. The main difference is that tablets tend to cause more digestive sensitivity, while injections are more associated with mild injection-site reactions.

GLP-1 tablets

Wegovy tablets

Novo Nordisk’s published U.S. self-pay pricing says:

• $149 per month for 1.5mg and 4mg
• $299 per month for 9 mg and 25mg

Further reading: Where to buy Wegovy tablets

Orforglipron

Lilly’s listed U.S. self-pay pricing is:

• $149 for 0.8mg
• $199 for 2.5mg
• $299 for 5.5mg and 9mg
• $349 for 14.5mg and 17.2mg

Further reading: Where to buy orforglipron

Injections

Wegovy

Chemist Click pricing is:

Making use of discount code: WEIGHT20

Mounjaro

Chemist Click pricing is:

Making use of discount code: WEIGHT20

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.

United States 

GLP-1 tablets

Both medications are now available in the U.S. Foundayo (orforglipron) received FDA approval in April 2026, and oral Wegovy tablets received FDA-approval in December 2025.   

Injections

Wegovy is available and FDA-approved for weight loss.
Mounjaro is available and approved for type 2 diabetes; weight-loss version approved as Zepbound.  

United Kingdom 

GLP-1 tablets

These medications are not yet available in the UK for weight loss.  

Further reading: Where to buy Wegovy tablets 

Further reading: Where to buy orforglipron

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