GLP-1 receptor agonists slow gastric emptying and suppress appetite, which can reduce energy intake and cause fatigue Fatigue is most common during initial weeks and dose increases, often improving as the body adapts over several weeks to months Nutritional deficiencies in protein, iron, vitamin D, and B vitamins may develop when food intake drops significantly Optimising nutrition with nutrient-dense foods, maintaining hydration, and gentle physical activity can significantly reduce tiredness Contact your GP if fatigue is severe, worsening, or accompanied by signs of dehydration, hypoglycaemia, or persistent gastrointestinal symptoms Table of Contents Why GLP-1 Medications Can Cause Tiredness Glucagon-like peptide-1 (GLP-1) receptor agonists are increasingly prescribed medications for type 2 diabetes and weight management, including semaglutide (Ozempic, Wegovy) and liraglutide (Victoza, Saxenda)
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They will also take into consideration whether the patient is on other drugs that might be obesogenic, meaning causing weight gain, or if they are using an FDA-approved GLP-1 drug versus a compounded medication, which can have variable quality and unknown efficacy
Improvements in neurotransmitter cycling supported synaptic function and memory consolidation