Saxenda vs Wegovy: which is better?

Wegovy produces more weight loss on average and is a weekly injection rather than daily. Most prescribers default to Wegovy unless there's a specific reason to choose Saxenda (supply, taper flexibility, individual tolerance).

Is Saxenda available on the NHS?

Limited. NICE TA664 recommends liraglutide for weight management only in adults with BMI 35 or over plus pre-diabetes, accessed through specialist services. Most UK Saxenda use is private.

Why is it daily instead of weekly?

Liraglutide has a half-life of about 13 hours. To keep blood levels in range, you have to dose it every day. Semaglutide and tirzepatide have half-lives long enough to dose weekly.

Can I switch from Saxenda to Wegovy?

Yes, with medical supervision. Most clinicians stop Saxenda for a few days, then start Wegovy at the lowest dose and titrate up. Direct dose conversions don't exist because the molecules are different.

Saxenda

Also called liraglutide weight loss, liraglutide 3 mg.

Dr Chad OkayFounder, Suna Health

3 min read. Updated 17 September 2026.

Saxenda is the brand name Novo Nordisk uses for liraglutide injections at a 3 mg daily dose, licensed for weight loss. It was the first GLP-1 receptor agonist approved for weight management. Most prescribers have shifted to weekly options like Wegovy and Mounjaro because daily injections are inconvenient and Saxenda produces less weight loss in trials.

What Saxenda is

Saxenda is liraglutide, a GLP-1 receptor agonist taken as a daily injection. The same molecule is sold as Victoza at 1.8 mg daily for type 2 diabetes. Saxenda goes up to 3 mg daily and is licensed for weight management in adults with a body mass index (BMI) of at least 30, or 27 with a weight-related health condition.

How it compares to Wegovy and Mounjaro

Average weight loss: about 8% on Saxenda 3 mg at 56 weeks, against about 15% on Wegovy at 68 weeks and about 21% on tirzepatide at 72 weeks.
Schedule: daily injection on Saxenda, weekly on Wegovy and Mounjaro.
Side effects are similar (nausea, constipation, reflux) but daily peaks make Saxenda nausea more variable across the day.
Cost: usually similar per month, but Saxenda needs many more pens because of the daily schedule.

Why it's still prescribed

Saxenda was the first GLP-1 receptor agonist approved for weight management (FDA, December 2014), so it has the longest post-launch track record of the weight-loss GLP-1 drugs. It is sometimes preferred when a clinician wants the option to escalate or back down quickly (because the half-life is shorter than weekly drugs) or when supply of weekly options has been disrupted. Some people also tolerate the daily ramp better than the weekly peak and trough.

Side effects

Nausea: very common in the first 4 to 8 weeks.
Constipation: common, gut transit slows.
Diarrhoea: common in a smaller subset.
Reflux and burping.
Injection-site reactions are common because of daily injecting.
Rare but serious: pancreatitis, gallstones, delayed gastric emptying. Severe, persistent abdominal pain needs a doctor the same day, not a wait-and-see approach (see below).

If something feels wrong

This entry is reference information, not medical guidance. Your doctor and pharmacist know you and your medicine; if anything about how you feel worries you, speak to them promptly, and if you ever feel seriously unwell, treat it as an emergency. The medicine's own patient information leaflet carries the important safety information and is worth reading in full.

Common questions

Saxenda vs Wegovy: which is better?: Wegovy produces more weight loss on average and is a weekly injection rather than daily. Most prescribers default to Wegovy unless there's a specific reason to choose Saxenda (supply, taper flexibility, individual tolerance).
Is Saxenda available on the NHS?: Limited. NICE TA664 recommends liraglutide for weight management only in adults with BMI 35 or over plus pre-diabetes, accessed through specialist services. Most UK Saxenda use is private.
Why is it daily instead of weekly?: Liraglutide has a half-life of about 13 hours. To keep blood levels in range, you have to dose it every day. Semaglutide and tirzepatide have half-lives long enough to dose weekly.
Can I switch from Saxenda to Wegovy?: Yes, with medical supervision. Most clinicians stop Saxenda for a few days, then start Wegovy at the lowest dose and titrate up. Direct dose conversions don't exist because the molecules are different.

Sources

Saxenda (liraglutide) EMA summary of product characteristics: indication, 3.0 mg dosing, 13-hour half-life, adverse reactions (European Medicines Agency)
Saxenda 6 mg/mL solution for injection (liraglutide) SmPC: adverse reactions and delayed gastric emptying (EMC (UK))
NICE TA664: liraglutide for managing overweight and obesity (recommendation 1.1, BMI ≥ 35, non-diabetic hyperglycaemia, specialist tier 3 service) (NICE)
Pi-Sunyer et al 2015, SCALE Obesity and Prediabetes: liraglutide 3.0 mg, 8.0% vs 2.6% weight loss at 56 weeks (population pharmacokinetic analysis reporting the SCALE result) (Clinical Pharmacokinetics (PMC))
Wilding et al 2021, STEP 1: once-weekly semaglutide 2.4 mg, -14.9% body weight at week 68 (New England Journal of Medicine (PubMed))
Jastreboff et al 2022, SURMOUNT-1: tirzepatide once weekly, -20.9% at 15 mg at week 72 (New England Journal of Medicine (PubMed))
Drugs@FDA: Saxenda (liraglutide) NDA 206321 - original approval for chronic weight management December 2014; adolescent 12-17 indication added December 2020 (US Food and Drug Administration)
Multisociety clinical practice guidance for the safe use of GLP-1 receptor agonists in the perioperative period (2024) (Clinical Gastroenterology and Hepatology)