How injectable and tablet options really differ on effectiveness, side effects, cost and day-to-day practicality.
Prices checked against the source, with the date shown
We say plainly where the other option is stronger
Verifiable facts only — no logos, no adjectives
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The choice between an injection and a tablet is usually presented as a matter of preference. In practice it involves real trade-offs in effectiveness, side effects, cost and how likely you are to keep taking it.
This page sets those out plainly, including where the tablet is the better choice — which is more often than the marketing around injectables suggests.
| Weekly injection | Oral semaglutide | Orlistat | |
|---|---|---|---|
| Average weight loss | Greatest | Moderate | Modest |
| How often | Once a week | Every day | With fatty meals |
| Main practical demand | Injecting, fridge storage | Strict empty stomach, 30 minutes clear | Keeping dietary fat down |
| Cost | Highest | Middle | Lowest by far |
| Main side effects | Nausea, vomiting, constipation | The same | Oily stools, urgency, wind |
Injectable GLP-1 and dual-agonist medicines produce greater average weight loss in trials than the tablet options currently available. That is the honest headline.
But average trial results assume people keep taking the medicine. In practice the treatment that works is the one you will still be using in a year.
Orlistat is substantially the cheapest. Injectables are the most expensive. Oral semaglutide sits between them. All are paid to your pharmacy, not to us.
No weight management medicine is side-effect free. The right comparison is not which has fewer side effects in the abstract, but which side effects you are most able to live with.
Injectables are GLP-1 or dual-agonist medicines given weekly. Tablets include daily oral semaglutide and orlistat, which works by a completely different mechanism.
If you are comfortable injecting and can afford it, an injectable is likely to produce more weight loss.
If needles are a genuine barrier, a tablet you actually take beats an injection you avoid.
If cost is the deciding factor, orlistat is a legitimate treatment rather than a consolation prize — it has been in use far longer and has a well-understood safety record.
None of these work without changes to diet and activity, and any service telling you otherwise is selling rather than treating.
Whichever you choose, the monitoring is not optional — but what is being watched differs.
Changing from one to another is common and not a failure. People move from tablet to injection because absorption was unreliable, from injection to tablet because of cost or needles, and off GLP-1 medicines to orlistat when the price stops being sustainable.
Any switch is a clinical decision made at a review, not a straight swap of one box for another.
£40, whichever treatment is discussed, and charged whether or not a prescription follows. Reviews are £40 each. The choice of medicine does not change what you pay us — which is worth stating, because it means we have no financial reason to steer you towards the expensive one.
All medication is paid to your pharmacy, and we earn nothing from any of it. The ordering is consistent:
Prices differ substantially between pharmacies for the identical product. Ring two or three and ask for the price at your dose before handing the prescription over. NHS exemptions do not apply to private prescriptions.
Be cautious of upfront multi-month packages. They give the seller a commercial interest in keeping you on treatment and moving you up the doses, and they leave you out of pocket if the medicine does not suit you.
Never buy from anywhere that does not require a genuine consultation. Counterfeit pens circulate in the UK and people have been hospitalised.
On average they produce more weight loss — that is the honest headline, and the marketing is not wrong about it.
But trial averages assume people keep taking the medicine. The treatment that works is the one you will still be using in a year, and for some people that is not the injection.
Yes — oral semaglutide is genuinely effective when taken correctly, and a tablet you will take beats an injection you avoid.
Two things worth knowing first. Modern pen needles are very small, and many people who were certain they could not inject manage comfortably after one demonstration. And the tablet's empty-stomach routine is stricter than most people expect — for some it is the harder ask.
First thing, completely empty stomach, no more than half a glass of water, and nothing else at all for 30 minutes. No coffee, no food, no other tablets.
It is the commonest reason the tablet underperforms, and if you take levothyroxine or several morning medicines it becomes genuinely awkward.
No. It is a legitimate treatment with decades of safety data, no hormonal action, and a fraction of the cost — and it is right for a lot of people, particularly where cost is the deciding factor or GLP-1 medicines are unsuitable.
Its effect is modest and its side effects are directly proportional to dietary fat. If you will not reduce fat, do not start it.
The wrong question. None is side-effect free, and the real question is which side effects you can live with.
GLP-1 medicines — nausea, vomiting, constipation, worst after each dose increase, usually settling. Orlistat — oily stools, wind and urgency, entirely predictable from what you eat.
Yes, and plenty of people do. Tablet to injection when absorption looks unreliable; injection to tablet for cost or needles; off the GLP-1 medicines to orlistat when the price stops being sustainable.
It is a clinical decision made at a review, since doses do not translate straight across.
On average yes, for the medicine itself — but not necessarily for you.
A treatment you can afford for two years beats one you can afford for four months, because stopping is generally followed by regain. Sustainability is part of effectiveness, not separate from it.
No, and any service telling you otherwise is selling rather than treating.
That is truest of orlistat, where the diet is the mechanism — but it applies to all of them, particularly for protein intake and preserving muscle.
No. The consultation is £40 whichever treatment is discussed, and we earn nothing from any medication — we do not dispense, and we have no arrangement with any pharmacy.
It is a fair question to ask any private weight service, and where the answer is yes, the incentive to prescribe is built into the business model.
Clinically reviewed by Dr Mohammad Zubair Khan, GMC 7563469
Last reviewed
August 23, 2026
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