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Glyset Side Effects Center
Medical Editor: John P. Cunha, DO, FACOEP
Glyset (miglitol) is an alpha-glucosidase inhibitor that works by slowing the absorption of carbohydrates, so that blood sugar does not rise as much after a meal, used to treat non-insulin-dependent (Type II) diabetes mellitus. Common side effects of Glyset include diarrhea, gas, upset stomach, stomach or abdominal pain, skin rash, or iron deficiency anemia in the first few weeks of treatment as the body adjusts to this medication but these side effects usually improve with time.
Dosage of Glyset is individualized on the basis of effectiveness and tolerance while not exceeding the maximum recommended dosage of 100 mg 3 times daily. It is taken three times daily at the start (with the first bite) of each main meal. The initial dose of Glyset is 25 mg, and the dosage gradually increased as prescribed. Glyset may interact with digestive-enzyme supplements such as pancreatin (amylase, protease, lipase), propranolol, ranitidine, digoxin, other diabetes medicines, thiazide diuretics (water pills), steroids, estrogen or an estrogen-containing birth control pill, thyroid medications, phenytoin, or calcium channel blockers. Tell your doctor all medications and supplements you use. Glyset should be used only when prescribed during pregnancy. Your doctor may substitute insulin for this drug during pregnancy. This drug passes into breast milk. Consult your doctor before breastfeeding.
Our Glyset (miglitol) Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication.
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.
What is Patient Information in Detail?
Easy-to-read and understand detailed drug information and pill images for the patient or caregiver from Cerner Multum.
Glyset in Detail - Patient Information: Side Effects
Stop taking miglitol and seek emergency medical attention if you experience an allergic reaction (difficulty breathing; closing of your throat; swelling of your lips, tongue, or face; or hives).
Other, less serious side effects, are more likely to occur. Continue to take miglitol and talk to your doctor if you experience
- abdominal pain,
- flatulence, or
- a rash.
Side effects other than those listed here may also occur. Talk to your doctor about any side effect that seems unusual or that is especially bothersome. You may report side effects to FDA at 1-800-FDA-1088.
Read the entire detailed patient monograph for Glyset (Miglitol)
What is Patient Information Overview?
A concise overview of the drug for the patient or caregiver from First DataBank.
Glyset Overview - Patient Information: Side Effects
Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.
Miglitol does not cause low blood sugar (hypoglycemia). However, this effect can occur if you also take other anti-diabetic drugs (e.g., sulfonylureas, insulin) and if you do not consume enough calories (from food, juices, fruit, etc.). The symptoms include chills, cold sweat, blurred vision, dizziness, drowsiness, shaking, rapid heart rate, weakness, headache, fainting, tingling of the hands or feet, or hunger. Do not use table sugar or drink non-diet soda to relieve these symptoms because miglitol delays the breakdown of table sugar. Carry glucose tablets or gel with you to treat low blood sugar. If you are in a situation where you don't have these reliable forms of glucose, eat some honey or drink a glass of orange juice to quickly raise your blood sugar level. Tell your doctor immediately about the reaction. To help prevent hypoglycemia, eat meals on a regular schedule and do not skip meals.
Check with your doctor or pharmacist about what you should do if you miss a meal.
Symptoms of high blood sugar (hyperglycemia) include thirst, increased urination, confusion, drowsiness, flushing, rapid breathing, or fruity breath odor. If these symptoms occur, tell your doctor immediately. Your medication dosage may need to be increased or you may need other drugs.
This medication may rarely cause a serious intestinal condition (pneumatosis cystoides intestinalis). Tell your doctor right away if you develop: persistent diarrhea, constipation, blood/mucus in stool.
A very serious allergic reaction to this drug is unlikely, but seek immediate medical attention if it occurs. Symptoms of a serious allergic reaction may include: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.
This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.
In the US -
Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.
Read the entire patient information overview for Glyset (Miglitol)
What is Prescribing information?
The FDA package insert formatted in easy-to-find categories for health professionals and clinicians.
Glyset FDA Prescribing Information: Side Effects
Gastrointestinal symptoms are the most common reactions to GLYSET Tablets. In U.S. placebo-controlled trials, the incidences of abdominal pain, diarrhea, and flatulence were 11.7%, 28.7%, and 41.5% respectively in 962 patients treated with GLYSET 25 100 mg 3 times daily, whereas the corresponding incidences were 4.7%, 10.0%, and 12.0% in 603 placebo-treated patients. The incidence of diarrhea and abdominal pain tended to diminish with continued treatment.
Skin rash was reported in 4.3% of patients treated with GLYSET compared to 2.4% of placebo-treated patients. Rashes were generally transient and most were assessed as unrelated to GLYSET by physician investigators.
Abnormal Laboratory Findings
Low serum iron occurred more often in patients treated with GLYSET (9.2%) than in placebo-treated patients (4.2%) but did not persist in the majority of cases and was not associated with reductions in hemoglobin or changes in other hematologic indices.
The following adverse reactions have been reported during post-approval use of GLYSET. Because these reactions are reported voluntarily from a population of uncertain size, it is generally not possible to reliably estimate their frequency or establish a causal relationship to drug exposure.
- Pneumatosis Cystoides Intestinalis
There have been rare postmarketing reports of pneumatosis cystoides intestinalis associated with the use of alpha-glucosidase inhibitors, including GLYSET. Pneumatosis cystoides intestinalis may present with symptoms of diarrhea, mucus discharge, rectal bleeding, and constipation. Complications may include pneumoperitoneum, volvulus, intestinal obstruction, intussusception, intestinal hemorrhage, and intestinal perforation. If pneumatosis cystoides intestinalis is suspected, discontinue Glyset and perform the appropriate diagnostic imaging.
Read the entire FDA prescribing information for Glyset (Miglitol)
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Report Problems to the Food and Drug Administration
You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.
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