Low blood sugar as a side effect of oral
diabetes medicines usually causes mild symptoms, such as sweating, shakiness,
Taking too many of your diabetes pills in one day, not
eating enough food, or doing strenuous physical activity can cause your
blood sugar level to drop below your target range.
If your blood sugar is low and you don't eat anything, it may
drop to a very low level. Keep some hard candy, raisins, or other quick sugar
foods with you at all times. Eat some at the first sign of low blood
Test your blood sugar often so you do not have to guess when
it is low.
Teach your friends and coworkers what to do if your
blood sugar is very low.
Low blood sugar (hypoglycemia) means that the level of sugar
(glucose) in your blood has dropped below what your body needs to function
normally. When your blood sugar level drops below 70
milligrams per deciliter (mg/dL), you most likely will
have symptoms, such as feeling tired, weak, or shaky.
Symptoms of low blood sugar usually develop
If your blood sugar level drops just slightly below
your target range, you may have symptoms of mild low blood
sugar. If you eat something that contains sugar, your symptoms may last only a
short time. If you have had diabetes for many years, you may not realize your
blood sugar is low until it drops very low. This is called
If your blood sugar level continues to drop (usually below 40
mg/dL), your behavior may change. Symptoms of moderate low blood sugar may
start. You may become too weak or confused to eat something to raise your blood
If your blood sugar level drops very low (below 20 mg/dL), you
may lose consciousness or have a seizure. If you have symptoms of severe low
blood sugar, you need medical care immediately.
What causes low blood sugar?
Low blood sugar levels can be caused by having too much insulin in your body and/or not enough sugar in your blood. This can happen with some
oral medicines used to treat diabetes and also with
insulin shots. This is more likely to happen if you eat less food than usual,
exercise, or do intense physical work. Very low blood sugar levels most often
develop rapidly (in 10 to 15 minutes) when a person has skipped a meal and is
doing intense physical work. Reduced kidney function can prolong the action of
diabetes medicine, possibly making low blood sugar levels more frequent.
Usually, blood sugar levels in people who take diabetes medicine drop
only low enough to cause mild symptoms. Very low blood sugar levels usually do
not occur in people with diabetes who do not take insulin shots. Some
pills used to treat type 2 diabetes are more likely to
cause low blood sugar than others.
Continue to take your full dose of
sulfonylurea pills or meglitinide pills when you are not
going to eat your usual amount of food.
without eating enough food.
Drink too much alcohol, especially on
an empty stomach.
Take certain other
medicines that lower blood sugar. Some medicines that
you can buy without a prescription can affect blood sugar. Talk with your
doctor about your prescription and nonprescription medicines and the risk of
developing very low blood sugar levels.
Test Your Knowledge
Low blood sugar means that the level of sugar in the
blood has dropped below what the body needs to function normally, usually below
Low blood sugar means that the level of sugar
in the blood has dropped below what the body needs to function normally,
usually below 70 mg/dL. When your blood sugar level drops below 70 mg/dL, you
most likely will have symptoms, such as feeling tired, weak, or shaky.
Low blood sugar does
mean that the level of sugar in the blood has dropped below what the body needs
to function normally, usually below 70 mg/dL. When your blood sugar level drops
below 70 mg/dL, you most likely will have symptoms, such as feeling tired,
weak, or shaky.
Very low blood sugar levels (below 20 mg/dL) are
emergency situations and require immediate care.
Even mild low blood sugar can affect the way you think and respond to things around you. And mild low blood sugar can quickly drop to a more dangerous level.
If your blood sugar drops below 40 mg/dL, your
brain may receive too little sugar to work properly and your judgment and
muscle coordination will be affected. These are symptoms of moderate low blood
sugar. You may not realize that your blood sugar is too low, and you may not be
aware that you need to eat food to raise the level. Someone else may have to
help you eat or drink something to raise your blood sugar level. If you do not
get help, your brain may not work properly. This can cause an accident if you
are driving a car or operating other machinery.
If your blood sugar level drops below 20 mg/dL,
which is considered severe low blood sugar, you can lose consciousness. If you
do not receive prompt emergency care, you may go into a coma, have a
heart attack, or stroke, and possibly die.
Test Your Knowledge
If my blood sugar level drops very low (below 20
If your blood sugar level drops to 20 mg/dL or
lower, someone else will need to help you eat or drink something to increase
your blood sugar level, or you may need emergency medical help. You may fall into a coma and possibly die.
are some ways you can manage low blood sugar.
quick-sugar foods with you at all times. These foods will help raise your
blood sugar by about 30 mg/dL within about 15 minutes. If you are at home, you
most likely will already have something close at hand that contains sugar, such
as table sugar or fruit juice. Carry some hard candy or glucose tablets when
you are away from home.
symptoms of low blood sugar, such as sweating, blurred vision, and confusion. Post them where you will
see the list often. And carry a copy in your wallet or purse. Be sure that your
partner and others concerned know your early symptoms, including the signs of
low blood sugar at night.
Wear medical identification, such as a
medical alert bracelet, to let people know that you have diabetes. People will
know that you have diabetes and will get help for you if
Teach others (at work and at home) how to check your
blood sugar in case you cannot check it yourself. Keep the instructions for
using your blood sugar (glucose) meter with the meter, so the person can review
the instructions if needed.
Teach other people (at work and at
home) what to do in case your blood sugar becomes very low. Post information on
emergency care for low blood sugar in a convenient
place so that those around you can take the proper steps when your blood sugar
is very low.
Treat low blood sugar levels as soon as you (or someone else) notice the
Check your blood sugar often. If you have had
diabetes for many years, you may not have symptoms until your blood sugar is
steps for dealing with low blood sugar when you first
develop your symptoms of low blood sugar or when your blood sugar level is
below your target range (usually below 70
mg/dL). Encourage others to tell you if they notice you are developing signs of
low blood sugar.
Keep a record(What is a PDF document?) of low blood sugar levels. Write down
your symptoms and how you treated your low blood sugar.
Notify your doctor if you are having frequent low blood sugar
problems. Your pills for diabetes may need to be adjusted or changed.
Test Your Knowledge
To be prepared for low blood sugar, I need
An extra dose of your medicine will cause your
blood sugar to drop even lower. The best way to deal with
low blood sugar emergencies is to prevent them by treating low blood sugar
symptoms as soon as you (or someone else) notice the symptoms. To raise your
blood sugar, eat some food that contains sugar.
If you sleep or rest, your blood sugar level
may continue to drop, leading to an emergency situation. The best way to deal with low blood sugar emergencies is to prevent them by
treating low blood sugar symptoms as soon as you (or someone else) notice the
symptoms. To raise your blood sugar, eat some food that contains sugar.
Now that you have read this
information, you are ready to start dealing with low blood sugar levels
If you have questions about this information, take it
with you when you visit your doctor. You may want to write down any questions you have.
If you would like more information on dealing with low
blood sugar levels, the following resources are available:
American Diabetes Association (ADA)
1701 North Beauregard Street
Alexandria, VA 22311
The American Diabetes Association (ADA) is a national organization
for health professionals and consumers. Almost every state has a local office.
ADA sets the standards for the care of people with diabetes. Its focus is on
research for the prevention and treatment of all types of diabetes. ADA
provides patient and professional education mainly through its publications,
which include the monthly magazine Diabetes Forecast,
books, brochures, cookbooks and meal planning guides, and pamphlets. ADA also
provides information for parents about caring for a child with diabetes.
How this information was developed to help you make better health decisions.