Direct answer
Can you buy orlistat over the counter in the UK?
Yes – but only the lower-dose version. Alli 60 mg is available without a prescription from pharmacies and registered online pharmacies. The higher-dose orlistat 120 mg (also sold as Xenical) requires a prescription from a GP or registered online clinic. Same active ingredient; different strength; different access route.
OTC vs prescription
Alli 60 mg vs orlistat 120 mg: what is the difference?
Alli 60 mg – over the counter
The brand-name OTC version of orlistat at half the prescription dose. Available from pharmacies and online without a prescription. A pharmacist or online health check will ask about your BMI (must be 28 or above) and any medical conditions or medications before selling it. One capsule taken with each main meal, up to three per day.
Orlistat 120 mg – prescription required
The full prescription-strength dose, available as Xenical (brand) or generic orlistat. Requires a prescription. Licensed for BMI 30 or above, or BMI 28 or above with a weight-related condition such as type 2 diabetes or high blood pressure. Can be prescribed by a GP or through a registered online prescribing service. One capsule taken with each main meal, up to three per day.
Getting Alli without a prescription
How the pharmacist check works
When you buy Alli at a pharmacy or through a registered online pharmacy, you will be asked a few questions before it is dispensed. This is a legal requirement – the pharmacist must confirm the medication is appropriate for you. You will typically be asked about:
Your BMI
Alli is only suitable if your BMI is 28 or above. If your BMI is below 28, the pharmacist will not supply it – and it would be less likely to produce meaningful weight loss at a lower starting weight.
Current medications
Orlistat can reduce the absorption of some medicines, including ciclosporin, levothyroxine, and some antiretrovirals. The pharmacist will check for any interactions.
Medical history
Alli is not suitable for people with malabsorption syndrome, cholestasis (a liver condition), or kidney stones caused by oxalate. Pregnancy is also a contraindication. The check covers these points.
Online purchases go through the same checks – a registered online pharmacy will ask you to complete a health questionnaire reviewed by a pharmacist before your order is dispatched. If any site sells Alli without these checks, do not use it.
When you need a prescription instead
Who should see a GP or online clinic?
You want the 120 mg dose
The higher dose is more effective than 60 mg and is the dose used in most of the long-term clinical trials. To access it you need a prescription, either via your GP or an online prescribing service.
You take interacting medications
If you take ciclosporin, levothyroxine, warfarin, or certain other medicines, a GP or clinician should review whether orlistat is appropriate and monitor accordingly. A pharmacist OTC check may not be sufficient for complex medication combinations.
You have a relevant medical condition
Type 2 diabetes, hypothyroidism, or a history of kidney stones are examples where clinician oversight is preferable, even for the OTC dose. Orlistat can affect blood sugar and thyroid medication absorption.
You have had no success with OTC dose
If you have tried Alli 60 mg for 12 weeks without reaching 5% weight loss, a prescriber can assess whether the 120 mg prescription dose would be more appropriate for you.
Where to buy
Where to get orlistat in the UK
Alli 60 mg is widely available from high-street pharmacies (Boots, Lloyds, independent pharmacies) and GPhC-registered online pharmacies. Prescription orlistat 120 mg can be obtained through your GP, or through online prescribing services such as ZAVA, Chemist4U, Click Pharmacy, and others. Always check that any online pharmacy displays a GPhC registration number.
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FAQ
Common questions about buying orlistat OTC
Is Alli the same as orlistat?
Yes. Alli is the brand name for orlistat at 60 mg per capsule. Orlistat 120 mg (Xenical or generic) is the same active ingredient at double the dose. Both block fat absorption via the same mechanism.
Can I buy orlistat 120 mg without a prescription?
No. Orlistat 120 mg is a prescription-only medicine in the UK. If a website offers to sell 120 mg orlistat without a valid prescription, it is operating illegally and the product cannot be verified as safe or genuine. Always use a GPhC-registered pharmacy.
How long can I take Alli for?
Alli is intended for use alongside a reduced-fat diet. NICE guidance for orlistat generally uses 12 weeks as a review point – if you have not lost at least 5% of your starting body weight, treatment should be reconsidered. Longer-term use is possible but should be reviewed periodically with a pharmacist or clinician.
Do I need to tell a doctor I am taking Alli?
If you take any regular medications or have a chronic health condition, it is worth informing your GP, even if you bought Alli without a prescription. Orlistat can affect the absorption of some medicines, and your GP should know about any supplement you are taking long-term.
Related pages
Orlistat UK: full guide
How it works, cost, and where to buy. Read the guide.
Orlistat vs Xenical vs Alli
Comparison table of the same ingredient in different forms. Read the comparison.
Orlistat side effects
What to expect and how to manage it. Read more.
Important
Information only
Tablet Compare is information only. Always complete the pharmacy health check before purchasing any weight-loss medicine, and consult a clinician if you have any underlying conditions or take regular medication.