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
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A conservative approach might extend each titration step to 6 weeks rather than 4, allowing more time to assess the cumulative effects of both compounds before increasing the retatrutide dose
GLP-1 medications increase satiety and reduce calorie intakecreating an environment where inadequate protein and overtraining can accelerate muscle loss alongside fat loss
*These tips are valid for both men and women
BAC Water, or Bacteriostatic Water, is a specially formulated sterile water that includes a small concentration of benzyl alcohol