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What to do if…
your blood sugar reading is low and keeps dropping despite eating

Short answer

Treat it as urgent: take 15 grams of fast-acting carbs now, re-check in 15 minutes, and repeat. If you’re getting worse, can’t swallow safely, or it isn’t coming up after repeat treatment, call 911 (or have someone call for you).

Do not do these things

  • Do not drive or do anything where you could pass out or get injured.
  • Do not delay help if the number keeps falling or you feel worse.
  • Do not go to sleep.
  • Do not take more insulin or other glucose-lowering meds “to correct it.”
  • Do not start with slow snacks (high fat/protein like chocolate, peanut butter, milk) — they can work too slowly in a dropping low.
  • Do not drink alcohol.
  • Do not force food or drink if you’re very drowsy, choking, or might pass out.

What to do now

  1. Get safe and get someone with you. Sit or lie down. If you’re alone, call/text someone to come immediately and keep your phone unlocked. If you feel faint/confused, get on the floor.
  2. Confirm the reading quickly. If you use a CGM and it’s dropping fast, do a fingerstick if you can (CGMs can lag). In many US guidelines, below 70 mg/dL is treated as low — treat right away if you’re below this or you feel low.
  3. Use the “15–15 rule” with fast sugar now. Take 15 grams of fast-acting carbohydrate, such as:
    • Glucose tablets or gel (easiest to measure), or
    • 4 oz (about 1/2 cup) fruit juice or regular (non-diet) soda, or
    • Another quick sugar you can swallow safely.
  4. Re-check in 15 minutes. If still under 70 mg/dL or still dropping, treat again. Take another 15g fast carbs and re-check again in 15 minutes.
  5. Call 911 if any of these apply (don’t wait):
    • You’re getting confused, very drowsy, having trouble swallowing, or you had a seizure/blackout.
    • You can’t keep carbs down (vomiting) or the number keeps dropping despite treatment.
    • After repeat treatment (for example, two 15g cycles), you’re still below 70 mg/dL or worsening. While waiting: unlock the door if you can, lie on your side if very drowsy, and keep checking if you’re able.
  6. If you can’t safely eat or drink, this is an emergency.
    • If someone is with you and you have glucagon (nasal or injection) and they know how to use it, they should give it and call 911.
    • They should not put food or drink in your mouth if you’re very drowsy/unconscious (choking risk). Place you on your side.
  7. After you start coming up, prevent the next drop. Once you’re clearly improving and able to eat, have a longer-acting carb snack/meal (something starchy), especially if your next meal is not soon.
  8. If this was “hard to treat,” get urgent medical advice even if you feel better.
    • If you use long-acting insulin or take sulfonylureas, lows can recur — consider emergency evaluation if it keeps happening or won’t stay up.
    • If you’re not on diabetes medicines and you’re getting confirmed low readings, seek urgent same-day evaluation.

What can wait

  • You don’t need to figure out the exact cause right now.
  • You don’t need to change insulin doses, pump settings, or diabetes meds while you’re actively low and dropping.
  • You don’t need to eat a full meal first; quick sugar and re-checking comes first.
  • You don’t need perfect documentation — a simple timeline of readings and treatments is enough.

Important reassurance

A dropping low can cause intense fear, shakiness, and confusion because your brain is low on fuel. Repeating fast sugar and calling for help when it’s not responding is the correct safety-first move.

Scope note

These are immediate steps for the next minutes to hour. Recurrent or unexplained lows need follow-up, but that comes after you’re safe.

Important note

This guide is general information, not medical advice or a diagnosis. If your blood sugar won’t rise despite fast carbs, you can’t swallow safely, or you have severe symptoms, seek emergency care immediately.

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