Saxenda vs Ozempic UK:
Which GLP-1 Is Right for You?

What are Saxenda and Ozempic?

Saxenda and Ozempic are both injectable GLP-1 receptor agonists manufactured by Novo Nordisk. They work through the same mechanism — mimicking the natural GLP-1 hormone to reduce appetite, slow gastric emptying and improve blood glucose regulation — but they contain different active ingredients and have different licensed indications in the UK.

Saxenda contains liraglutide, which was originally developed as Victoza for type 2 diabetes. Saxenda uses a higher dose (3 mg) specifically for weight management. It requires a daily subcutaneous injection.

Ozempic contains semaglutide, a newer and more potent GLP-1 analogue. It is licensed in the UK for type 2 diabetes only, though it is widely used off-label for weight management in private practice. It requires only a once-weekly injection. The dedicated weight management version of semaglutide is Wegovy, which uses a higher dose (2.4 mg weekly).

Head-to-head comparison

Efficacy: which produces more weight loss?

The clinical evidence clearly favours semaglutide over liraglutide for weight loss. The STEP 8 trial provided the most direct comparison, pitting semaglutide 2.4 mg against liraglutide 3 mg in a head-to-head study of adults with obesity:

• Semaglutide 2.4 mg: Average weight loss of 15.8 per cent at 68 weeks
• Liraglutide 3 mg: Average weight loss of 6.4 per cent at 68 weeks
• Placebo: 1.9 per cent weight loss

Semaglutide therefore produced approximately 2.5 times the weight loss of liraglutide in this direct comparison. Additionally, a greater proportion of semaglutide patients achieved clinically meaningful weight loss thresholds (10 per cent, 15 per cent and 20 per cent of body weight).

Daily vs weekly injection: convenience matters

One of the most significant practical differences between Saxenda and Ozempic is the injection frequency. This affects adherence, convenience and patient experience substantially.

Saxenda: daily injection

• Requires injection at approximately the same time every day
• Must be refrigerated before first use; can be kept at room temperature (up to 30°C) for 30 days after first use
• Uses a multi-dose pen with disposable needles
• Missing a dose: if more than 12 hours late, skip and take the next dose at the usual time
• Daily dosing may be preferred by patients who like routine or want more control over timing

Ozempic: weekly injection

• One injection per week on the same day (the time of day can vary)
• Stored in the refrigerator; can be kept at room temperature for up to 56 days
• Uses a pre-filled single-use pen
• Missing a dose: take it as soon as you remember if within 5 days; otherwise skip to the next scheduled dose
• Weekly dosing is generally preferred by most patients for convenience and ease of adherence

Side effects compared

Both Saxenda and Ozempic share a similar side effect profile, which is typical of the GLP-1 receptor agonist class. Gastrointestinal symptoms are the most common and tend to be most pronounced during dose escalation.

Saxenda tends to have higher rates of gastrointestinal side effects, likely because the daily dosing pattern produces more frequent peaks and troughs in drug levels compared with the sustained weekly exposure from semaglutide. For comprehensive side effect management, see our GLP-1 side effects guide and Ozempic side effects guide.

NHS availability and cost

Saxenda on the NHS

Saxenda has been NICE-recommended for weight management since 2020. It is available through specialist weight management services (Tier 3) for adults with a BMI of 35 or above (or 32.5+ for certain ethnic groups) who also have at least one weight-related comorbidity. However, since the arrival of semaglutide and tirzepatide, which offer greater efficacy, Saxenda is being prescribed less frequently by NHS specialist services.

Ozempic on the NHS

Ozempic is available on the NHS exclusively for type 2 diabetes. It is not licensed or NICE-recommended for weight management. For NHS-funded weight loss treatment with semaglutide, patients must access Wegovy through specialist services, or Mounjaro (tirzepatide) as an alternative.

Private costs

Which should you choose?

The choice between Saxenda and Ozempic (or its weight management counterpart Wegovy) depends on your individual circumstances. Here is a general framework:

Saxenda may be suitable if:

• You are eligible for NHS prescribing through a specialist weight management service and Saxenda is what is available
• You have been prescribed Saxenda previously and responded well to it
• You prefer the flexibility of daily dosing (some patients find this easier to manage)
• You have tried semaglutide and experienced intolerable side effects at the weekly dose

Ozempic / Wegovy may be more suitable if:

• You want the most effective GLP-1 option for weight loss (semaglutide is more effective than liraglutide)
• You prefer a once-weekly injection for convenience and adherence
• You have type 2 diabetes (Ozempic is licensed for this) alongside a desire to lose weight
• You are accessing treatment through a private clinic where both options are available
• You want the additional cardiovascular protection demonstrated in the SELECT trial

Frequently asked questions

Can I switch from Saxenda to Ozempic?

Yes, switching from liraglutide to semaglutide is a recognised clinical practice. Your prescriber will typically stop Saxenda and start Ozempic or Wegovy at the lowest dose, then escalate according to the standard schedule. There is no need for a washout period between the two medications.

Is Saxenda being discontinued in the UK?

Saxenda is not being discontinued. It remains NICE-recommended and available on the NHS. However, prescribing has declined as clinicians increasingly favour more effective options such as Wegovy and Mounjaro. Saxenda continues to be available through private providers.

Can I use Saxenda and Ozempic together?

No. Saxenda and Ozempic should never be used simultaneously. Both are GLP-1 receptor agonists and combining them would significantly increase the risk of serious side effects, including severe gastrointestinal symptoms and pancreatitis. Only one GLP-1 receptor agonist should be used at a time.

Does Saxenda work for type 2 diabetes?

Liraglutide is used for type 2 diabetes under the brand name Victoza (at a maximum dose of 1.8 mg daily), not Saxenda (3 mg daily for weight management). If you have type 2 diabetes and want to lose weight, Ozempic or Mounjaro may be more appropriate as they are licensed for diabetes management and produce greater weight loss.