Acarbose
Prescription ·Exploratory record · not publication-reviewed ·Updated July 13, 2026
Acarbose is an oral alpha-glucosidase inhibitor used with diet and exercise to improve glycemic control in adults with type 2 diabetes by reducing post-meal glucose spikes. It acts locally in the intestine and commonly causes flatulence, diarrhea, and abdominal discomfort. If hypoglycemia occurs with insulin or sulfonylureas, oral glucose (dextrose), not sucrose, should be used for treatment.
Exploratory record, not a reviewed medical publication.
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What the research says.
A quick, data-only summary. The full evidence, dosing, and sources are below.
Acarbose is an oral alpha-glucosidase inhibitor used with diet and exercise to improve glycemic control in adults with type 2 diabetes by reducing post-meal glucose spikes. NutriStack rates the supporting evidence as strong. Common adult dosing is Start 25 mg orally three times daily with the first bite of each main meal; titrate to 50-100 mg three times daily as tolerated, though a prescriber sets the actual dose. This profile indexes 3 sources.
- Flatulence
- Diarrhea
- Abdominal pain
- Diabetic ketoacidosis or cirrhosis
- Inflammatory bowel disease, colonic ulceration, or partial intestinal obstruction
The bottom line
Evidence rating strong. Most-documented uses: reduces postprandial glucose excursions, lowers a1c modestly in type 2 diabetes, does not cause hypoglycemia alone. 3 sources indexed (1998–2026), with 0 interaction records on file.
How it works, mechanistically.
Core mechanism
Acarbose reversibly inhibits brush-border alpha-glucosidases, delaying breakdown of complex carbohydrates and disaccharides into absorbable monosaccharides. This slows carbohydrate absorption and reduces postprandial glucose excursions without directly increasing insulin secretion. Undigested carbohydrate reaching the colon produces fermentation-related gas and GI adverse effects.1,2
Dosing & protocol.
Must be taken with the first bite of a carbohydrate-containing meal to work. Separate from binding fibers if GI tolerance or absorption is a concern.
Full safety detail.
Side effects
- Flatulence
- Diarrhea
- Abdominal pain
- Bloating
- Nausea
- Elevated transaminases at higher doses
- Rare ileus-like symptoms
Sources, by evidence tier.
Numbered references. Citations throughout the page link here.
Randomized controlled trials
2- 1Acarbose for prevention of type 2 diabetes mellitus: the STOP-NIDDM randomised trialChiasson JL et al. · Lancet · 2002
Acarbose reduced progression to diabetes in impaired glucose tolerance but caused GI effects.
- 2Impairment of absorption of digoxin by acarboseMiura T et al. · Journal of Clinical Pharmacology · 1998
Acarbose reduced digoxin exposure in a crossover study.
Reference material
1- 3Acarbose tablets US prescribing informationUS Food and Drug Administration · DailyMed FDA Label · 2026
Label recommends dosing with first bite and oral glucose for hypoglycemia when combined with insulin or sulfonylureas.
Common questions.
Quick answers about Acarbose, drawn from the data on this page.
What is Acarbose?
Acarbose is an oral alpha-glucosidase inhibitor used with diet and exercise to improve glycemic control in adults with type 2 diabetes by reducing post-meal glucose spikes. It acts locally in the intestine and commonly causes flatulence, diarrhea, and abdominal discomfort. If hypoglycemia occurs with insulin or sulfonylureas, oral glucose (dextrose), not sucrose, should be used for treatment.
What is Acarbose used for?
Commonly cited benefits of Acarbose include: Reduces postprandial glucose excursions; Lowers A1c modestly in type 2 diabetes; Does not cause hypoglycemia alone; May help patients with carbohydrate-driven glucose spikes. NutriStack rates the overall evidence as strong.
What is a typical dose of Acarbose?
A typical adult dose of Acarbose is Start 25 mg orally three times daily with the first bite of each main meal; titrate to 50-100 mg three times daily as tolerated. The commonly recommended form is Oral tablet taken with the first bite of each main meal. These are general ranges, not personalized advice; confirm the right dose with a clinician.
What are the side effects of Acarbose?
Reported side effects include flatulence, diarrhea, abdominal pain, bloating, nausea, elevated transaminases at higher doses. This is educational information; check with a healthcare professional before use.
How strong is the evidence for Acarbose?
NutriStack rates this as Strong, meaning multiple high-quality meta-analyses or systematic reviews converge on the same finding. Full tier criteria are at https://nutristackapp.com/methodology/evidence-tiers.
Use this with your stack
Acarbose in NutriStack.
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