Severe Allergic Reactions (Anaphylaxis/Severe Hypersensitivity): Symptoms : Swelling of face, lips, tongue, or throat Difficulty breathing or swallowing Severe rash or hives covering large body areas Rapid heartbeat Severe dizziness or lightheadedness Loss of consciousness Action Required : Call 911 immediately - this is life-threatening emergency Use epinephrine auto-injector if available (EpiPen) Do not attempt to drive yourself Inform emergency responders about GLP-1 medication Incidence : Very rare (less than 0.1% of users) Future Use : If severe allergic reaction occurs, cannot use that medication or potentially any GLP-1 medication again Hypoglycemia (Low Blood Sugar): Symptoms : Shakiness or trembling Sweating (cold sweat) Rapid heartbeat or palpitations Dizziness or lightheadedness Hunger Irritability or mood changes Confusion or difficulty concentrating Blurred vision Weakness or fatigue Headache Action Required : Check blood glucose if glucometer available Consume 15-20 grams fast-acting carbohydrates immediately: 4 glucose tablets 4 ounces fruit juice 5-6 pieces hard candy 1 tablespoon honey or sugar Recheck glucose in 15 minutes If still low, repeat treatment Contact healthcare provider same day If severe (unconscious, seizure), call 911 Risk Factors : PRIMARY RISK : Taking GLP-1 medication WITH other diabetes medications that cause hypoglycemia: Insulin (any type) Sulfonylureas (glipizide, glyburide, glimepiride) Meglitinides (repaglinide, nateglinide) GLP-1 medications alone rarely cause hypoglycemia because they're glucose-dependent (only work when glucose elevated) Prevention : Healthcare provider should reduce insulin or sulfonylurea doses when starting GLP-1 medication Monitor blood glucose closely during first weeks Coordinate with diabetes care team Acute Kidney Injury : Symptoms : Decreased urination or no urination Swelling in legs, ankles, feet, face Fatigue or weakness Shortness of breath Confusion or difficulty thinking clearly Nausea Irregular heartbeat Action Required : Contact healthcare provider immediately May require urgent evaluation with lab work May require hospitalization Risk Factors : Severe dehydration (from vomiting or diarrhea) Pre-existing kidney disease Certain medications (NSAIDs, ACE inhibitors, diuretics) Older age Prevention : Maintain adequate hydration, especially during dose increases Monitor for severe GI symptoms Inform provider of any existing kidney disease Diabetic Retinopathy Worsening : Symptoms : Blurred vision or vision changes Floaters (spots in vision) Flashes of light Dark areas or blind spots in vision Difficulty seeing at night Action Required : Contact both healthcare provider AND eye doctor (ophthalmologist) Requires dilated eye examination May require treatment to prevent vision loss Risk Factors : Pre-existing diabetic retinopathy Rapid improvement in blood glucose control Poor glucose control prior to treatment Mechanism : Rapid blood glucose improvements can temporarily worsen retinopathy (paradoxical effect) Prevention : Gradual dose escalation

It is also too early to know what impact quitting has on long-term health (Youmshajekian) Acknowledgements This piece was originally published in April 2025 by Lara Marks with the generous help of Svetlana Mojsov, Jens Holst and Richard Ng who read early drafts
Chronic stress similarly undermines results through cortisol elevation
Affinity of peptide 1 for wild-type and StaR constructs was measured using homologous competition experiments against three different concentrations of 3 H-peptide 1
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