Contact your GP within a few days if you experience: Heartburn occurring more than twice weekly despite lifestyle modifications Symptoms requiring daily antacid use for more than two weeks Difficulty swallowing (dysphagia) or painful swallowing (odynophagia) Persistent nausea or vomiting, particularly if severe Unintentional weight loss that seems excessive or is accompanied by other symptoms Symptoms that significantly impact quality of life or medication adherence Seek urgent medical attention if you develop: Severe chest pain , particularly if radiating to the arm, jaw, or backcall 999 immediately if cardiac cause is suspected Vomiting blood or material resembling coffee grounds Black, tarry stools (melaena) suggesting gastrointestinal bleeding Severe, persistent upper abdominal pain, especially if radiating to the back (possible pancreatitis) Right upper abdominal pain with fever or yellowing of the skin/eyes (possible gallbladder disease) Persistent vomiting with early satiety and bloating (possible gastroparesis) Inability to keep down fluids, risking dehydration Your GP may arrange investigations including upper gastrointestinal endoscopy if symptoms are severe, persistent, or accompanied by alarm features
The GLP-1 receptor agonist component is considered, based on established class effects, a likely contributor to these gastrointestinal adverse events, as GLP-1 activation slows gastric emptying and alters intestinal transit time
Nausea timing shifts based on when you inject and when you eat after dosing
GLP-1 activation slows your gut, and your gut needs time to find a new equilibrium
For the step-by-step mixing procedure, see the companion retatrutide reconstitution guide
