Glucagon: emergency low blood sugar, how to use it
Last updated September 3, 2026.
Glucagon is the emergency rescue for severe low blood sugar - it tells the liver to release its stored sugar when the person cannot swallow juice or sugar themselves. The kit nobody wants to use and everybody around a person with diabetes should know cold.
What does it treat?
Severe hypoglycemia - blood sugar low enough to cause confusion, unconsciousness, or seizures. It also has a second, unrelated use: slowing digestive movement during certain X-ray tests.
How do you use it?
Inject at the first sign of severe hypoglycemia - the training happens before the emergency, not during. The steps: inject, turn the person onto their side in case they vomit, and get emergency medical help immediately. An unconscious person usually wakes within 15 minutes; if not, a second dose. Once awake and able to swallow: fast sugar first - juice or a regular soft drink - then long-acting sugar - crackers, cheese, a sandwich. Family, coworkers, and school staff are the real users: the person with severe hypoglycemia rarely gives it to themselves.
Side effects to know
- Common: nausea and vomiting after waking - the reason for the side position.
- Serious: no waking after 15 minutes and a second dose - the ambulance is already on its way by then, because the call happens at injection time, not after.
Who needs one nearby?
Anyone at risk of severe hypoglycemia - people on insulin or certain diabetes medications - with the kit where others can find it: home, work, school, gym bag. Check the expiration date on a schedule; an expired kit is a false friend. The people around the kit need the training, not just the person who owns it.
When is it an emergency?
It IS the emergency: severe hypoglycemia - unconsciousness, seizure, inability to swallow - means inject and call 911 immediately. For an accidental overdose, call Poison Control at 1-800-222-1222. Pymander's escalation routing is built and tested specifically for this class of decision; see the safety architecture working paper.
What a Pymander AI doctor consult looks like
Illustrative example, not a real member's messages.
Common questions
When exactly do I use the glucagon kit?
At the first sign of SEVERE hypoglycemia: confusion, unconsciousness, seizure, or the person cannot safely swallow sugar. Mild lows get juice or glucose tabs - the kit is for when those cannot work. Inject, turn the person on their side, call 911 immediately. Waiting to see if they come around on their own is the dangerous choice; the injection is the safe one.
What are the exact steps after the injection?
The arc: inject, side position in case of vomiting, 911 call immediately - not after watching. An unconscious person usually wakes within 15 minutes; no waking means a second dose. Once awake and able to swallow: fast sugar first - juice or a regular soft drink - then long-acting sugar - crackers, cheese, or a sandwich - because the liver's released stores need refilling.
Who should know how to use it?
Everyone regularly around the person: family, the office colleague, the coach, the school nurse, the teenager. The person having the severe low rarely self-injects - the kit exists for the people nearby. A ten-minute drill with the trainer device, repeated every few months, is what makes hands steady in the real minute.
How many kits should exist and where?
Wherever life happens: home, work, school, gym bag, the grandparent's house. One kit that lives in a drawer at home does nothing during the emergency at the gym. Every kit: expiration date in a phone with a reminder - expired glucagon is a false friend, and the date arrives quietly.
Why the side position?
Because nausea and vomiting are common after glucagon - and a person just waking from a severe low can choke on vomit. Side position first, always. It is the step people skip in drills and the one that matters most in the real event.
Does it expire? Can I use an expired kit in a real emergency?
Yes, it expires - and potency fades with time and heat. The expiration dates belong in a phone with reminders, and replacement happens before the date, not after. In a true emergency with nothing else available, call 911 first and tell them what you have - but the whole point of the reminder system is never facing that choice.