Glucagon for Severe Hypoglycemia in Dental Practice

Emergency medicine: Glucagon injection

German term: Glukagon bei schwerer Hypoglykämie / schwerer Unterzuckerung

Category: Emergency drug; hyperglycemic hormone for severe hypoglycemia when oral glucose is unsafe or ineffective

Dental role: Emergency treatment for a diabetic patient with severe hypoglycemia who is unconscious, too drowsy, uncooperative, fitting, or unable to swallow safely

Common emergency form: Glucagon 1 mg emergency kit for intramuscular or subcutaneous injection. Product forms vary by country, so every dental team must follow its local emergency kit and training protocol.

This article is for dental education only. Severe hypoglycemia can become life-threatening. Glucagon is used when oral glucose cannot be given safely or has failed. Do not put food, drink, glucose tablets, or glucose gel into the mouth of an unconscious or unsafe-swallow patient. Call emergency medical services, follow ABCDE, protect the airway, and use glucagon only according to local emergency training and protocol.

Glucagon is an emergency medicine used for severe hypoglycemia, especially in diabetic patients treated with insulin or sulfonylurea-type medicines. It raises blood glucose by stimulating the liver to release glucose from stored glycogen.

In the dental clinic, oral glucose is preferred when the patient is conscious and can swallow safely. Glucagon becomes important when the patient is unconscious, very drowsy, confused, uncooperative, fitting, or unable to swallow.

The key clinical principle is: oral glucose for safe swallow; glucagon plus emergency escalation for unsafe swallow or severe deterioration. Never delay emergency help when consciousness is impaired.

• Best dental use: severe hypoglycemia when oral glucose is unsafe, impossible, or ineffective
• Common trigger: missed meal, insulin, sulfonylureas, delayed appointment, anxiety, exercise, or alcohol
• Typical adult dose: glucagon 1 mg IM or SC according to emergency kit and protocol
• Typical pediatric dose: 0.5 mg for children under about 8 years or under 25 kg; 1 mg for older/heavier children, according to product and local guidance
• Clinical priority: call emergency services and protect the airway when consciousness is impaired

Glucagon is a hormone that has the opposite emergency direction to insulin. It tells the liver to break down glycogen and release glucose into the bloodstream.

• Main action: increases blood glucose by hepatic glycogenolysis and gluconeogenesis.
• Why injection is used: severe hypoglycemia may make swallowing unsafe, so a parenteral route is needed.
• After recovery: oral carbohydrate is still needed because glucagon effect may be temporary.
• Important limitation: glucagon may be less effective when liver glycogen stores are depleted, such as prolonged fasting, starvation, heavy alcohol intake, or severe illness.
• Clinical meaning: if glucagon does not rapidly improve the patient, emergency medical care is essential.

• History of diabetes, insulin, or glucose-lowering tablets
• Sweating, pallor, trembling, hunger, weakness, or anxiety
• Confusion, slurred speech, irritability, aggression, or unusual behavior
• Drowsiness, poor cooperation, or inability to follow instructions
• Blurred vision, headache, dizziness, or palpitations
• Seizure or loss of consciousness in severe hypoglycemia
• Symptoms after missed meal, delayed lunch, early appointment, or insulin use
• Blood glucose reading low if a glucometer is available, but treatment should not be dangerously delayed

• Hypoglycemic patient is unconscious or losing consciousness
• Patient is too drowsy, confused, or uncooperative to swallow safely
• Patient is having a seizure or has unsafe airway control
• Oral glucose has been tried but symptoms persist or the patient deteriorates
• Safe oral carbohydrate cannot be given because of aspiration risk
• Severe hypoglycemia requires help from another person to treat
• Emergency services are called and the dental team follows local protocol while waiting

• Patient is conscious and can safely swallow: oral glucose is usually first-line.
• Patient has hyperglycemia rather than hypoglycemia.
• Patient has not improved after glucagon: urgent medical care is required.
• Patient is suspected to have prolonged fasting, starvation, or alcohol-related glycogen depletion: response may be reduced.
• Patient has an alternative emergency such as stroke, seizure disorder, cardiac event, anaphylaxis, or syncope: continue ABCDE and emergency assessment.
• Dental team is not trained in the product: follow local emergency policy and call emergency services immediately.

1. Stop dental treatment immediately.
2. Remove instruments and call for help from the team.
3. Assess ABCDE, consciousness, breathing, pulse, and airway risk.
4. Check blood glucose if equipment is available, but do not delay emergency treatment when hypoglycemia is likely.
5. If conscious and can swallow: give 15–20 g fast-acting oral carbohydrate and reassess.
6. If unconscious or unsafe swallow: do not give anything by mouth; call emergency medical services.
7. Administer glucagon according to local protocol, training, and product instructions.
8. Place the patient safely and protect the airway because nausea and vomiting may occur after glucagon.
9. Monitor continuously until the patient fully recovers or emergency help arrives.
10. After consciousness returns: give oral glucose, then longer-acting carbohydrate if safe and appropriate.

• Adults: commonly 1 mg glucagon IM or SC.
• Children over about 8 years or over 25 kg: commonly 1 mg IM or SC.
• Children under about 8 years or under 25 kg: commonly 0.5 mg IM.
• Always check: local protocol, emergency kit instructions, training, expiry date, and route available.
• Do not delay: if the patient is unconscious, call emergency services even if glucagon is given.

• Bring the emergency kit immediately and check the product instructions.
• Some kits require reconstitution of powder with solvent before injection.
• Use the product immediately after preparation according to the instructions.
• Inject intramuscularly or subcutaneously according to protocol and product labeling.
• Record time, dose, route, batch/expiry if required, patient response, and emergency actions.
• Train the whole dental team so roles are clear before an emergency happens.
• Check emergency drug expiry dates regularly and replace expired kits.

• Known hypersensitivity to glucagon or product components
• Pheochromocytoma: glucagon can trigger dangerous catecholamine release and severe hypertension
• Insulinoma: glucagon may cause an initial rise followed by exaggerated insulin release and recurrent hypoglycemia
• Prolonged fasting, starvation, heavy alcohol use, or glycogen depletion may reduce glucagon effectiveness
• Vomiting risk: airway protection and safe positioning are essential
• Pregnancy, children, elderly patients, and medically complex patients require strict local emergency protocol and urgent medical support
• In a life-threatening emergency, do not let theoretical caution delay calling emergency services and following trained emergency procedures

• Do not give oral glucose when swallowing is unsafe. Aspiration can be fatal.
• Glucagon does not replace emergency services. Severe hypoglycemia needs medical backup.
• Vomiting can occur. Position and monitor the patient to protect the airway.
• Response may be temporary. Once awake and safe, the patient needs oral carbohydrate.
• No response is dangerous. Consider alternative diagnoses and urgent escalation.
• Do not restart dental treatment. The emergency must be fully resolved and medically safe.
• Document carefully. Record signs, glucose reading if measured, drug dose, route, time, and response.

The biggest glucagon mistake is giving oral sugar to the wrong patient. If the patient is unconscious, very drowsy, fitting, or cannot swallow safely, nothing goes into the mouth. Call emergency services, protect the airway, and use glucagon according to emergency protocol.

• Nausea and vomiting
• Temporary headache, dizziness, or weakness after recovery
• Injection-site discomfort
• Tachycardia, palpitations, or blood pressure changes
• Recurrent hypoglycemia if no follow-up carbohydrate is given
• Allergic reaction is rare but possible
• Limited or absent response in glycogen-depleted states
• Persistent altered consciousness if the diagnosis is not simple hypoglycemia

• Give oral glucose once the patient is awake and can swallow safely.
• Give longer-acting carbohydrate if the next meal is not imminent.
• Do not let the patient leave alone immediately after severe hypoglycemia.
• Recheck blood glucose if possible and continue monitoring.
• Identify the cause: missed meal, medication timing, long appointment, anxiety, or illness.
• Inform the patient’s medical team if appropriate.
• Document the emergency fully in the dental record.
• Reschedule elective dental treatment and modify future appointment planning.

Glucagon is not the first step for every hypo. It is the rescue drug when oral glucose is unsafe or has failed. The safest decision is based on consciousness and swallowing: safe swallow means oral glucose; unsafe swallow means no oral intake, emergency call, airway protection, and glucagon.

• Loss of consciousness or inability to swallow safely
• Seizure, collapse, or persistent confusion
• No response to oral glucose or glucagon
• Recurrent hypoglycemia after temporary improvement
• Breathing difficulty, airway concern, vomiting with reduced consciousness, or aspiration risk
• Suspected stroke, cardiac emergency, anaphylaxis, or non-diabetic cause of collapse
• Very low blood glucose reading or inability to check glucose with severe symptoms
• Patient is alone, medically fragile, pregnant, elderly, or has complex diabetes therapy

• Oral Glucose for Hypoglycemia
• Oxygen in Dental Emergencies
• Adrenaline for Anaphylaxis
• Salbutamol for Asthma Attack
• Syncope Protocol
• Diabetic Emergency Protocol
• Medical Emergency Kit in Dentistry
• ABCDE Assessment
• Insulin and Dental Appointments
• Emergency Documentation

Glucagon is a rescue emergency medicine for severe hypoglycemia in dental practice when oral glucose is unsafe, impossible, or ineffective. It is especially important for diabetic patients who become unconscious, drowsy, confused, uncooperative, fitting, or unable to swallow. The usual adult dental emergency dose is 1 mg IM or SC, with 0.5 mg commonly used for younger or smaller children according to local guidance. Glucagon works by releasing glucose from liver glycogen, so its effect may be reduced after prolonged fasting, starvation, heavy alcohol intake, or glycogen depletion. It can cause nausea and vomiting, so airway protection and safe positioning are essential. After the patient wakes and can swallow, oral glucose and longer-acting carbohydrate are needed to prevent recurrence. Glucagon does not replace emergency services, ABCDE assessment, monitoring, documentation, and careful future diabetes appointment planning.