What is tolbutamide?
Tolbutamide is an oral diabetes medicine that helps control blood sugar levels. This medication helps your pancreas produce insulin.
Tolbutamide is used together with diet and exercise to treat type 2 diabetes. Other diabetes medicines are sometimes used in combination with tolbutamide if needed.
Tolbutamide should not be used by itself to treat type 1 diabetes.
Tolbutamide may also be used for purposes not listed in this medication guide.
Before taking this medicine
You should not use this medicine if you are allergic to tolbutamide, or if you are in a state of diabetic ketoacidosis. Call your doctor for treatment with insulin.
To make sure tolbutamide is safe for you, tell your doctor if you have:
a disorder of your pituitary or adrenal glands;
an enzyme deficiency called glucose-6-phosphate dehydrogenase deficiency (G6PD);
a history of heart disease; or
if you are malnourished.
Certain oral diabetes medications may increase your risk of serious heart problems. However, not treating your diabetes can damage your heart and other organs. Talk to your doctor about the risks and benefits of taking tolbutamide.
It is not known whether tolbutamide will harm an unborn baby. Similar diabetes medications have caused severe hypoglycemia in newborn babies whose mothers had used the medication near the time of delivery. Tell your doctor if you are pregnant or plan to become pregnant while using tolbutamide.
It is not known whether tolbutamide passes into breast milk or if it could be harmful to a nursing baby. You should not breast-feed while you are taking tolbutamide.
How should I take tolbutamide?
Follow all directions on your prescription label. Do not take this medicine in larger or smaller amounts or for longer than recommended.
Follow your doctor's instructions about how often to take tolbutamide, and whether or not you should take it with food.
Your blood sugar will need to be checked often, and you may need other blood tests at your doctor's office.
Low blood sugar (hypoglycemia) can happen to everyone who has diabetes. Symptoms include headache, hunger, sweating, confusion, irritability, dizziness, or feeling shaky. Always keep a source of sugar with you in case you have low blood sugar. Sugar sources include fruit juice, hard candy, crackers, raisins, and non-diet soda. Be sure your family and close friends know how to help you in an emergency.
If you have severe hypoglycemia and cannot eat or drink, use a glucagon injection. Your doctor can prescribe a glucagon emergency injection kit and tell you how to use it.
Check your blood sugar carefully during times of stress, travel, illness, surgery or medical emergency, vigorous exercise, or if you drink alcohol or skip meals. These things can affect your glucose levels and your dose needs may also change. Do not change your medication dose or schedule without your doctor's advice.
Use tolbutamide regularly to get the most benefit. Get your prescription refilled before you run out of medicine completely.
Tolbutamide is only part of a treatment program that may also include diet, exercise, weight control, regular blood sugar testing, and special medical care. Follow your doctor's instructions very closely.
Store at room temperature away from moisture, heat, and light.
What happens if I miss a dose?
Take the missed dose as soon as you remember (with food if your doctor instructs you to). Skip the missed dose if it is almost time for your next scheduled dose. Do not take extra medicine to make up the missed dose.
What happens if I overdose?
Seek emergency medical attention or call the Poison Help line at 1-800-222-1222. An overdose of tolbutamide can cause severe hypoglycemia.
Symptoms of severe hypoglycemia include extreme weakness, blurred vision, sweating, trouble speaking, tremors, stomach pain, confusion, and seizure (convulsions).
What should I avoid while taking tolbutamide?
Avoid drinking alcohol. It lowers blood sugar and may interfere with your diabetes treatment.
Avoid exposure to sunlight or tanning beds. Tolbutamide can make you sunburn more easily. Wear protective clothing and use sunscreen (SPF 30 or higher) when you are outdoors.
Tolbutamide side effects
Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have:
severe skin rash, redness, or itching;
easy bruising or bleeding,
pale or yellowed skin, dark colored urine;
low blood sugar--headache, hunger, weakness, sweating, confusion, irritability, dizziness, fast heart rate, or feeling jittery; or
low levels of sodium in the body--headache, confusion, slurred speech, severe weakness, vomiting, loss of coordination, feeling unsteady.
Common side effects may include:
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
See also: Side effects (in more detail)
Tolbutamide dosing information
Usual Adult Dose for Diabetes Type 2:
Initial dose: 1 to 2 g orally once a day or in divided doses through the day
-Adjust dose based on blood glucose response
Maintenance dose: 0.25 to 3 g orally once a day or in divided doses through the day
Maximum dose: 3 g per day
Comments: Transferring patients from other oral antidiabetic regimens should be done conservatively:
-When transferring from chlorpropamide, particular care should be exercised during the first 2 weeks due to the potential for overlapping hypoglycemic effects.
-When transferring from insulin therapy, concurrent insulin therapy should be maintained in patients requiring 20 units of insulin/day or more:
--Patients requiring 20 to 40 units of insulin/day should have insulin reduced by 30% to 50% for the first few days, and then adjust therapy based on response.
--Patients requiring more than 40 units of insulin/day should have insulin reduced by 20% the first day, and then adjust therapy based on response.
Use: As an adjunct to diet to lower blood glucose in patients with type 2 diabetes whose hyperglycemia cannot be controlled by diet alone.
What other drugs will affect tolbutamide?
You may be more likely to have hypoglycemia (low blood sugar) if you take tolbutamide with other drugs that can lower blood sugar, such as:
sulfa drugs (Bactrim, SMZ-TMP, and others);
a monoamine oxidase inhibitor (MAOI); or
insulin or other oral diabetes medications.
This list is not complete, and many other medicines can increase or decrease the effects of tolbutamide on lowering your blood sugar. This includes prescription and over-the-counter medicines, vitamins, and herbal products. Tell your doctor about all medicines you use, and those you start or stop using during your treatment with tolbutamide. Not all possible interactions are listed in this medication guide.
More about tolbutamide
- Side Effects
- During Pregnancy or Breastfeeding
- Dosage Information
- Drug Images
- Drug Interactions
- Support Group
- Pricing & Coupons
- En Español
- 0 Reviews – Add your own review/rating
- Drug class: sulfonylureas
Related treatment guides
Where can I get more information?
- Your pharmacist can provide more information about tolbutamide.
- Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.
- Disclaimer: Every effort has been made to ensure that the information provided by Cerner Multum, Inc. ('Multum') is accurate, up-to-date, and complete, but no guarantee is made to that effect. Drug information contained herein may be time sensitive. Multum information has been compiled for use by healthcare practitioners and consumers in the United States and therefore Multum does not warrant that uses outside of the United States are appropriate, unless specifically indicated otherwise. Multum's drug information does not endorse drugs, diagnose patients or recommend therapy. Multum's drug information is an informational resource designed to assist licensed healthcare practitioners in caring for their patients and/or to serve consumers viewing this service as a supplement to, and not a substitute for, the expertise, skill, knowledge and judgment of healthcare practitioners. The absence of a warning for a given drug or drug combination in no way should be construed to indicate that the drug or drug combination is safe, effective or appropriate for any given patient. Multum does not assume any responsibility for any aspect of healthcare administered with the aid of information Multum provides. The information contained herein is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. If you have questions about the drugs you are taking, check with your doctor, nurse or pharmacist.
Copyright 1996-2012 Cerner Multum, Inc. Version: 6.05.
Date modified: March 06, 2018
Last reviewed: October 15, 2015