Key Insights Fatigue is a common but usually temporary side effect during the initial weeks or dose changes in GLP-1 therapy, caused largely by rapid calorie deficit, dehydration, and metabolic adjustments. Maintaining steady energy requires prioritising nutrient-dense meals rich in protein and complex carbohydrates, staying well hydrated, and managing electrolyte balance, which helps mitigate tiredness and supports overall metabolism. Gentle physical activity and good sleep hygiene are critical lifestyle adjustments that improve circulation, mood, and energy levels without overtaxing the body during the drug adaptation period. Persistent, worsening, or debilitating fatigue should prompt medical evaluation to exclude other causes, reassess medication dosing, and ensure safe continuation of GLP-1 therapy under healthcare supervision. Frequently asked questions Why do GLP-1 medications cause fatigue

He told our family how Morgan was there for him through rough times throughout his treatments
Bupropion stimulates the appetite-regulating centres, while naltrexone blocks a feedback loop that would otherwise blunt that effect together reducing hunger and the cravings that drive overeating
For example, injecting near a shoulder injury might be best timed before rest periods rather than before workouts