Seek immediate medical attention (call 999 or attend A&E) if you experience: Severe bleeding that won't stop, including nosebleeds lasting more than 10 minutes, vomiting blood, or coughing up blood Blood in urine (pink, red, or dark brown discolouration) or black, tarry stools Severe, persistent abdominal pain radiating to the back, with or without vomiting (possible pancreatitis) also stop taking Ozempic Sudden severe headache , confusion, vision changes, or weakness, which could indicate intracranial bleeding Signs of severe allergic reaction to Ozempic, including facial swelling, difficulty breathing, or widespread rash Contact your GP or diabetes specialist nurse within 2448 hours if: Persistent gastrointestinal symptoms (nausea, vomiting, diarrhoea) that prevent you from taking medications or maintaining hydration Unusual bruising or bleeding that seems excessive for minor trauma Signs of dehydration including reduced urination, dizziness, or extreme thirst Difficulty managing blood glucose levels or unexplained hypoglycaemia Sudden visual changes or new floaters (possible retinopathy or vitreous haemorrhage) For urgent but non-emergency concerns, contact NHS 111 for advice

These symptoms often worsen when you bend over, lie down, or try hard to lift heavy objects
Consider adjusting your dose: Most GI side effects happen during dose increases, and some people feel better when they stay at a lower dose for longer
For example, a 2021 study on semaglutide showed an average weight loss of around 15% in obese individuals over 68 weeks on maximum dose of semaglutide, compared to a placebo groups 2.4%
Last updated January 20, 2026