Tolazamide is no longer available in the United States.
Why is this medicine prescribed?
Tolazamide is used along with diet and exercise, and sometimes with other medications, to treat type 2 diabetes (condition in which the body does not use insulin normally and, therefore, cannot control the amount of sugar in the blood). Tolazamide is in a class of medications called sulfonylureas. Tolazamide lowers blood sugar by causing the pancreas to produce insulin (a natural substance that is needed to break down sugar in the body) and helping the body use insulin efficiently. This medication will only help lower blood sugar in people whose bodies produce insulin naturally. Tolazamide is not used to treat type 1 diabetes (condition in which the body does not produce insulin and, therefore, cannot control the amount of sugar in the blood) or diabetic ketoacidosis (a serious condition that may occur if high blood sugar is not treated).
Over time, people who have diabetes and high blood sugar can develop serious or life-threatening complications, including heart disease, stroke, kidney problems, nerve damage, and eye problems. Taking medication(s), making lifestyle changes (e.g., diet, exercise, quitting smoking), and regularly checking your blood sugar may help to manage your diabetes and improve your health. This therapy may also decrease your chances of having a heart attack, stroke, or other diabetes-related complications such as kidney failure, nerve damage (numb, cold legs or feet; decreased sexual ability in men and women), eye problems, including changes or loss of vision, or gum disease. Your doctor and other healthcare providers will talk to you about the best way to manage your diabetes.
Are there other uses for this medicine?
This medication is sometimes prescribed for other uses; ask your doctor or pharmacist for more information.
How should this medicine be used?
Tolazamide comes as a tablet to take by mouth. It is usually taken once a day with breakfast or the first main meal of the day. However, in some cases your doctor may tell you to take tolazamide twice a day. To help you remember to take tolazamide, take it at around the same time(s) every day. Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. Take tolazamide exactly as directed. Do not take more or less of it or take it more often than prescribed by your doctor.
Your doctor will probably start you on a low dose of tolazamide and gradually increase your dose if needed. After you have taken tolazamide for some time, tolazamide may not control your blood sugar as well as it did at the beginning of your treatment. Your doctor may adjust the dose of your medication as needed so that the medication will work best for you. Be sure to tell your doctor how you are feeling and if your blood sugar test results have been higher or lower than normal at any time during your treatment.
What special precautions should I follow?
Before taking tolazamide,
- tell your doctor and pharmacist if you are allergic to tolazamide, any other medications, or any of the ingredients in tolazamide. Ask your pharmacist for a list of the ingredients.
- tell your doctor and pharmacist what prescription and nonprescription medications, vitamins, nutritional supplements, and herbal products you are taking or plan to take. Be sure to mention anticoagulants ('blood thinners') such as warfarin (Coumadin); aspirin and other nonsteroidal anti-inflammatory medications (NSAIDs) such as ibuprofen (Advil, Motrin) and naproxen (Aleve, Naprosyn); beta blockers such as atenolol (Tenormin), labetalol (Normodyne), metoprolol (Lopressor, Toprol XL), nadolol (Corgard), and propranolol (Inderal); calcium channel blockers such as amlodipine (Norvasc), diltiazem (Cardizem, Dilacor, Tiazac, others), felodipine (Plendil), isradipine (DynaCirc), nicardipine (Cardene), nifedipine (Adalat, Procardia), nimodipine (Nimotop), nisoldipine (Sular), and verapamil (Calan, Isoptin, Verelan); chloramphenicol; diuretics ('water pills'); fluconazole (Diflucan), hormone replacement therapy and hormonal contraceptives (birth control pills, patches, rings, implants, and injections); insulin or other medications to treat high blood sugar or diabetes; isoniazid (INH); MAO inhibitors such as isocarboxazid (Marplan), phenelzine (Nardil), selegiline (Eldepryl, Emsam, Zelapar), and tranylcypromine (Parnate); medications for asthma and colds; medications for mental illness and nausea; miconazole (Monistat); niacin; oral steroids such as dexamethasone (Decadron, Dexone), methylprednisolone (Medrol), and prednisone (Deltasone); phenytoin (Dilantin); probenecid (Benemid); salicylate pain relievers such as choline magnesium trisalicylate, choline salicylate (Arthropan), diflunisal (Dolobid), magnesium salicylate (Doan's, others), and salsalate (Argesic, Disalcid, Salgesic); sulfa antibiotics such as co-trimoxazole (Bactrim, Septra); sulfasalazine (Azulfidine); and thyroid medications. Also be sure to tell your doctor or pharmacist if you stop taking any medications while taking tolazamide. Your doctor may need to change the doses of your medications or monitor you carefully for side effects.
- tell your doctor if you have or have ever had G6PD deficiency (an inherited condition causing premature destruction of red blood cells or hemolytic anemia); if you have hormone disorders involving the adrenal, pituitary, or thyroid gland; or if you have heart, kidney, or liver disease.
- tell your doctor if you are pregnant, plan to become pregnant, or are breast-feeding. If you become pregnant while taking tolazamide, call your doctor.
- plan to avoid unnecessary or prolonged exposure to sunlight and to wear protective clothing, sunglasses, and sunscreen. Tolazamide may make your skin sensitive to sunlight.
- ask your doctor what to do if you get sick, develop an infection or fever, experience unusual stress, or are injured. These conditions can affect your blood sugar and the amount of tolazamide you may need.
- if you are having surgery, including dental surgery, tell the doctor or dentist that you are taking tolazamide.
- ask your doctor about the safe use of alcoholic beverages while you are taking tolazamide. Alcohol can make the side effects from tolazamide worse. Consuming alcohol while taking tolazamide also rarely may cause symptoms such as flushing (reddening of the face), headache, nausea, vomiting, chest pain, weakness, blurred vision, mental confusion, sweating, choking, breathing difficulty, and anxiety.
What special dietary instructions should I follow?
Be sure to follow all exercise and dietary recommendations made by your doctor or dietitian. It is important to eat a healthy diet, exercise regularly, and lose weight if necessary.
What should I do if I forget to take a dose?
Before you start to take tolazamide, ask you doctor what you should do if you forget to take a dose. Write these directions down so that you can refer to them later.
What should I do in case of overdose?
In case of overdose, call the poison control helpline at 1-800-222-1222. Information is also available online at https://www.poisonhelp.org/help . If the victim has collapsed, had a seizure, has trouble breathing, or can't be awakened, immediately call emergency services at 911.
Symptoms of overdose may include hypoglycemia symptoms as well as the following:
- loss of consciousness
What side effects can this medicine cause?
This medication may cause changes in your blood sugar. You should know the symptoms of low and high blood sugar and what to do if you have these symptoms.
Tolazamide may cause side effects. Tell your doctor if any of these symptoms are severe or do not go away:
- upper abdominal fullness
Some side effects can be serious. If you experience any of these symptoms, call your doctor immediately:
- yellowing of the skin or eyes
- light-colored stools
- dark urine
- pain in the upper right part of the stomach
- unusual bruising or bleeding
- sore throat
Tolazamide may cause other side effects. Call your doctor if you have any unusual problems while taking this medication.
If you experience a serious side effect, you or your doctor may send a report to the Food and Drug Administration's (FDA) MedWatch Adverse Event Reporting program online ( http://www.fda.gov/Safety/MedWatch ) or by phone (1-800-332-1088).
In one study, people who took a medication similar to tolazamide to treat their diabetes were more likely to die of heart problems than people who were treated with insulin and diet changes. Talk to your doctor about the risks of taking tolazamide.
What should I know about storage and disposal of this medication?
Keep this medication in the container it came in, tightly closed, and out of reach of children. Store it at room temperature and away from light, excess heat, and moisture (not in the bathroom).
Unneeded medications should be disposed of in special ways to ensure that pets, children, and other people cannot consume them. However, you should not flush this medication down the toilet. Instead, the best way to dispose of your medication is through a medicine take-back program. Talk to your pharmacist or contact your local garbage/recycling department to learn about take-back programs in your community. See the FDA's Safe Disposal of Medicines website ( http://goo.gl/c4Rm4p ) for more information if you do not have access to a take-back program.
It is important to keep all medication out of sight and reach of children as many containers (such as weekly pill minders and those for eye drops, creams, patches, and inhalers) are not child-resistant and young children can open them easily. To protect young children from poisoning, always lock safety caps and immediately place the medication in a safe location – one that is up and away and out of their sight and reach. http://www.upandaway.org
What other information should I know?
Keep all appointments with your doctor and the laboratory. Your blood sugar and urine sugar levels should be checked regularly to determine your response to tolazamide. Your doctor may order other lab tests, including glycosylated hemoglobin (HbA1c), to check your response to tolazamide. Your doctor will also tell you how to check your response to this medication by measuring your blood or urine sugar levels at home. Follow these instructions carefully.
You should always wear a diabetic identification bracelet to be sure you get proper treatment in an emergency.
Do not let anyone else take your medication. Ask your pharmacist any questions you have about refilling your prescription.
It is important for you to keep a written list of all of the prescription and nonprescription (over-the-counter) medicines you are taking, as well as any products such as vitamins, minerals, or other dietary supplements. You should bring this list with you each time you visit a doctor or if you are admitted to a hospital. It is also important information to carry with you in case of emergencies.