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Medicines A–Z · GLP-1 receptor agonist

Semaglutide for Type 2 Diabetes (Ozempic)

A GLP-1 medicine for type 2 diabetes · Written by the Lyng Pharmacy team, based on NHS and BNF guidance · Updated August 2026
Also sold asOzempic, Rybelsus
Type of medicineGLP-1 receptor agonist
Available asWeekly injection pen; Rybelsus is a daily tablet
How you get itPrescription only

Semaglutide is a GLP-1 medicine licensed for type 2 diabetes as Ozempic (a weekly injection) and Rybelsus (a daily tablet). It lowers blood sugar, usually reduces appetite and weight, and has cardiovascular benefits in people with type 2 diabetes and established heart disease.

What it is used for

Type 2 diabetes, usually added when metformin alone is not enough, and to reduce cardiovascular risk in people with type 2 diabetes and established heart disease.

Ozempic is licensed for diabetes, not for weight loss. Semaglutide is licensed separately for weight management under a different brand and at different doses.

How to take it

Ozempic is injected under the skin of the stomach, thigh or upper arm once a week, on the same day each week, with or without food. Rotate the site each time. Doses are increased in steps over weeks to reduce nausea.

Rybelsus is taken once daily on an empty stomach with no more than half a glass of plain water, at least 30 minutes before food, drink or other medicines — absorption is very sensitive to this.

If you miss a weekly injection, take it within five days and then resume your usual day. If more than five days have passed, skip it. Never share a pen, even with a new needle.

Side effects

Nausea, vomiting, diarrhoea, constipation, indigestion and reduced appetite are common, worst after a dose increase, and usually ease over weeks. Smaller meals, eating slowly and avoiding fatty food help.

Seek urgent medical help for severe, persistent stomach pain that may spread to your back, with or without vomiting — a possible sign of pancreatitis. Stop the medicine and get assessed.

Also report severe upper right abdominal pain, jaundice or fever (gallbladder problems), persistent vomiting with dehydration, or changes in vision — rapid improvement in blood sugar can temporarily worsen diabetic retinopathy.

Hypos are unlikely on semaglutide alone but become possible with a sulfonylurea or insulin — those doses are often reduced when it is started.

Who should not take it

Tell your team about severe gastrointestinal disease, diabetic retinopathy, or any planned surgery or sedation, as GLP-1 medicines slow stomach emptying.

Always read the label. This page is general information, not advice for your situation. Doses, warnings and interactions differ between products and between people. Check the leaflet inside your medicine, and ask our pharmacist if anything is unclear — that conversation is free and takes two minutes.

Questions about Semaglutide (Ozempic)?

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Frequently asked questions

Is Ozempic a weight loss medicine?
No. Ozempic is licensed for type 2 diabetes. Semaglutide is licensed separately for weight management under a different brand and at different doses.
What if I miss my weekly semaglutide injection?
Take it within five days and resume your usual day. If more than five days have passed, skip that dose and take the next one as scheduled.
Why does semaglutide make me feel sick?
Nausea is the most common effect, worst after a dose increase, and usually eases over a few weeks. Smaller meals, eating slowly and avoiding fatty food help.
Can I share a semaglutide pen?
Never, even with a new needle. Pens are for one person only because of infection risk.

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