Common side effects still need attention

Nausea, diarrhoea, vomiting and other digestive symptoms occur with semaglutide, especially when you start or increase the dose. Mild symptoms and severe illness belong in different categories. Note when symptoms started, the date of your last injection and whether you can drink normally. Ask for advice if symptoms last, get worse or affect your eating, work, sleep or normal daily life.

Get severe stomach pain checked urgently

Severe stomach pain that does not go away, especially if it spreads to your back or comes with vomiting, needs urgent medical assessment. Pancreatitis is one possible cause. Do not write it off as normal "GLP-1 nausea" and wait for your next routine review. Other abdominal problems cause similar symptoms, so a clinician needs to find the cause. Do not diagnose yourself from a checklist.

Two different eye conditions

Diabetic retinopathy and non-arteritic anterior ischaemic optic neuropathy, or NAION, are different conditions. If you already have diabetic eye disease, you need regular monitoring. MHRA has also updated its semaglutide safety advice on NAION. Sudden loss of vision or fast-worsening eyesight needs urgent medical help. Do not put a change in your vision down to weight loss or wait for a booked eye appointment.

Fluids and glucose levels

Repeated vomiting or diarrhoea leads to dehydration and affects kidney function. Passing less urine, marked dizziness or being unable to keep fluids down all call for prompt clinical advice. If you also take insulin or a sulfonylurea, you need a plan for hypoglycaemia. Shakiness, sweating or confusion call for the action your diabetes team recommends. Severe confusion, unconsciousness or difficulty breathing is an emergency. Call 999.

Tell your clinical team about your health

Tell your prescriber about past pancreatitis, gallbladder problems, digestive disease, kidney problems, eye disease and pregnancy plans. Tell the anaesthetic team you take semaglutide before surgery or deep sedation, because slower stomach emptying matters. Do not follow an online rule about how long to stop treatment. Your team should give instructions for your procedure and your diabetes control.

Report side effects and ask for a review

You can report suspected side effects through the MHRA Yellow Card scheme. A report helps even when the cause is unclear, and a report does not prove the medicine caused the problem. Contact your prescriber as well, because a safety report does not arrange medical care. Never stay on a dose you cannot tolerate to avoid letting a provider down or losing access to treatment.

Describe your symptoms clearly

When you ask for help, say where the pain is, when it began, how bad it is and whether you can drink, pass urine and see normally. Mention fever, vomiting and any glucose results where relevant. Saying "I have Ozempic side effects" tells a clinician far less than a clear description of the symptom. The medicine may play a part without causing everything that happens during treatment. Your clinician should keep other causes in mind, especially when symptoms are new, severe or unlike earlier mild nausea.

Sources

Your own medicine leaflet and prescriber come first. A source from another country does not mean the same rule applies in the UK.

  1. Ozempic: UK prescribing information medicines.org.uk
  2. MHRA: semaglutide and NAION gov.uk
  3. MHRA: GLP-1 medicines and rapid insulin reduction gov.uk
  4. MHRA Yellow Card yellowcard.mhra.gov.uk

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