To get rid of low blood sugar quickly, eat or drink 15 grams of fast-acting carbohydrates, wait 15 minutes, and check your blood sugar again. This approach, known as the 15-15 rule, is the standard first-line treatment when blood sugar drops below 70 mg/dL. Most episodes resolve within minutes when treated promptly, but knowing what to reach for, how to follow up, and how to prevent future drops makes a real difference.
Recognizing the Signs
Low blood sugar often announces itself before it becomes dangerous. Early symptoms include feeling shaky or jittery, sudden hunger, dizziness, a racing heartbeat, headache, and irritability. You might also feel unusually tired or have trouble concentrating. These signs mean your brain and muscles aren’t getting enough fuel, and they’re your cue to act.
If blood sugar continues to fall, symptoms escalate. Confusion, slurred speech, blurry vision, and loss of coordination can set in. At its most severe, low blood sugar can cause seizures or loss of consciousness. The progression from mild shakiness to something dangerous can happen faster than people expect, which is why treating early matters so much.
Low blood sugar can also strike during sleep. Clues include night sweats heavy enough to soak your sheets, nightmares, crying out, or waking up feeling exhausted, confused, or irritable for no clear reason.
The 15-15 Rule: Step by Step
The goal is to get 15 grams of simple sugar into your bloodstream as fast as possible. Any of these will do the job:
- 4 ounces (half a cup) of fruit juice or regular soda (not diet)
- 3 to 4 glucose tablets
- 1 tube of glucose gel
- 1 tablespoon of sugar, honey, or syrup
- A small handful of jellybeans or hard candies (check the label for the right amount)
After eating or drinking one of these, wait 15 minutes and recheck your blood sugar. If it’s still below 70 mg/dL, repeat with another 15 grams. Keep cycling until your reading comes back up. This measured approach prevents you from overcorrecting and spiking your blood sugar too high in the other direction.
What to Eat After Your Blood Sugar Recovers
Once your reading is back above 70 mg/dL, the fast-acting sugar you just consumed will burn off quickly. Without a follow-up snack or meal, your blood sugar can drop right back down. Eat something that combines protein, fat, and complex carbohydrates to keep levels stable. A piece of whole-grain toast with peanut butter, cheese and crackers, or a small balanced meal all work well.
Avoid the temptation to keep eating sugary foods after you’ve recovered. Overloading on simple carbs can trigger a rebound spike followed by another crash, especially if you’re prone to reactive drops.
When It Becomes an Emergency
Severe low blood sugar is a medical emergency. If someone is unconscious, having a seizure, too confused to swallow safely, or not responding to the 15-15 rule after repeated attempts, they need glucagon or emergency medical help.
Glucagon is a hormone that signals the liver to release stored sugar into the bloodstream. It comes in forms that don’t require medical training to use: a nasal spray you administer like a nasal decongestant and premixed auto-injectors that work similarly to an EpiPen. These newer options replaced older kits that required mixing a powder with liquid under pressure, which was stressful and error-prone. Nearly half of people who use glucagon prefer the nasal spray for its simplicity. If you take insulin or are at risk of severe episodes, having one of these on hand and making sure the people around you know where it is and how to use it can be lifesaving.
Call 911 if glucagon isn’t available, if the person doesn’t regain consciousness within 10 to 15 minutes after receiving it, or if you’re unsure what’s happening.
Why Blood Sugar Drops in the First Place
For people with diabetes, the most common triggers are taking too much insulin, delaying or skipping a meal after taking medication, exercising harder or longer than usual, and drinking alcohol without eating. Even small shifts in routine, like eating lunch an hour late, can be enough to tip the balance when insulin or other glucose-lowering medication is active in your system.
People without diabetes can also experience low blood sugar. Reactive hypoglycemia causes a drop two to four hours after eating, often triggered by a meal high in refined carbohydrates. Certain medications unrelated to diabetes, excessive alcohol on an empty stomach, and hormonal conditions affecting the adrenal glands or liver can also drive blood sugar too low.
Preventing Future Episodes
Prevention comes down to keeping your blood sugar from swinging too far in either direction. A few practical strategies make the biggest difference:
Eat smaller, more frequent meals spaced roughly three hours apart rather than two or three large ones. Each meal or snack should include fiber, protein, and some fat to slow digestion and keep glucose entering your bloodstream steadily. High-fiber foods like whole grains, vegetables, and fruits are especially helpful. Avoid eating sugary foods or processed simple carbohydrates like white bread on an empty stomach, since these cause a rapid spike followed by a sharp drop.
If you drink alcohol, always eat something alongside it. Alcohol interferes with your liver’s ability to release stored glucose, which can cause blood sugar to fall hours after your last drink.
For nighttime drops, a small bedtime snack that includes protein and complex carbs can help maintain blood sugar through the hours you’re asleep. If you’re waking up with symptoms of overnight lows regularly, that’s a sign your medication timing or dosage may need adjusting.
Keep fast-acting glucose sources in predictable places: your nightstand, your car, your desk, your gym bag. When blood sugar drops, you don’t want to be searching for something to eat. Glucose tablets and gels are shelf-stable, portable, and pre-measured, making them more reliable than hoping there’s juice in the fridge.
Tracking Patterns Over Time
If low blood sugar happens more than occasionally, tracking when episodes occur reveals patterns that are hard to spot otherwise. Note the time, what you ate before the drop, how much physical activity you had, and any medications you took. Many people discover their lows cluster around specific situations: after a particular workout, on days they skip their afternoon snack, or during a certain window after taking medication. Those patterns point directly to the changes that will prevent future episodes, whether that means shifting a meal earlier, adjusting an exercise routine, or revisiting medication timing with your care team.