ReviewDiabetologia2016
Metformin and the gastrointestinal tract.
Review in Diabetologia, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 365 papers, 7 of them syntheses that pooled it.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
365 citing papers in PubMed, 7 syntheses or guidelines pooled it, 703 citations in OpenAlex.
- Efficacy and safety of variable-dose metformin as adjunctive therapy to insulin in adolescents with type 1 diabetes mellitus: a systematic review and network meta-analysis.BMC endocrine disorders · 2025Pooled it
- Comparison of GLP-1 Receptor Agonists Combined with Metformin Versus Metformin Alone in the Management of PCOS: A Comprehensive Meta-Analysis.Reproductive sciences (Thousand Oaks, Calif.) · 2025Pooled it
- Harnessing probiotic-metformin synergy: targeting the gut-microbiota metabolism axis to ameliorate polycystic ovary syndrome.Frontiers in nutrition · 2025Pooled it
- Metformin for preventing the progression of chronic kidney disease.The Cochrane database of systematic reviews · 2024 · on this mapPooled it
- Hypoglycemic activity ofFrontiers in pharmacology · 2024Pooled it
- Identification of Novel Intronic SNPs in Transporter Genes Associated with Metformin Side Effects.Genes · 2023Pooled it
- The effect of metformin on ameliorating neurological function deficits and tissue damage in rats following spinal cord injury: A systematic review and network meta-analysis.Frontiers in neuroscience · 2022Pooled it
- Effect of metformin on insulin resistance in adults with type 1 diabetes: a 26-week randomized double-blind clinical trial.Nature communications · 2025 · on this mapTrial
- Effect of Efsubaglutide Alfa on the Pharmacokinetics of Metformin and Digoxin in Healthy Participants.Clinical pharmacokinetics · 2025Trial
- Bioequivalence and Pharmacokinetic Evaluation of Two Metformin Hydrochloride Tablets Under Fasting and Fed Conditions in Healthy Chinese Volunteers.European journal of drug metabolism and pharmacokinetics · 2025Trial
- Short-term Metformin Protects Against Glucocorticoid-Induced Toxicity in Healthy Individuals: A Randomized, Double-Blind, Placebo-Controlled Trial.Diabetes care · 2025 · on this mapTrial
- Metformin, placebo, and endocrine therapy discontinuation among participants in a randomized double-blind trial of metformin vs placebo in hormone receptor-positive early-stage breast cancer (CCTG MA32).Breast cancer research and treatment · 2023Trial
- Bioequivalence and safety evaluation of two preparations of metformin hydrochloride sustained-release tablets (BokeAnnals of medicine · 2022Trial
- Cardiovascular Benefits of Empagliflozin Are Associated With Gut Microbiota and Plasma Metabolites in Type 2 Diabetes.The Journal of clinical endocrinology and metabolism · 2022Trial
- Metformin Therapy in Autosomal Dominant Polycystic Kidney Disease: A Feasibility Study.American journal of kidney diseases : the official journal of the National Kidney Foundation · 2022Trial
- Pharmacometabolomic profiles in type 2 diabetic subjects treated with liraglutide or glimepiride.Cardiovascular diabetology · 2021 · on this mapTrial
- Comparing measured and reported change in gastrointestinal symptoms after initiation of metformin treatment: a questionnaire validation study.Scandinavian journal of primary health care · 2026Article
- Lactobacillus gasseri alleviates type 2 diabetes via modulation of gut microbiota-host metabolic networks.Journal of endocrinological investigation · 2026Article
- Association Between Lactate Trajectories and Clinical Outcomes in Critically Ill Patients with Sepsis-Associated Liver Injury.Journal of clinical medicine · 2026Article
- Novel Bioequivalent Sitagliptin and Metformin Bilayer Tablet with Improved Chemical Stability.Pharmaceutics · 2026Article
305 more citing papers are in PubMed but not listed here.
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
3 authors at 2 institutions in 1 country.
Funding
Abstract
Metformin is an effective agent with a good safety profile that is widely used as a first-line treatment for type 2 diabetes, yet its mechanisms of action and variability in terms of efficacy and side effects remain poorly understood. Although the liver is recognised as a major site of metformin pharmacodynamics, recent evidence also implicates the gut as an important site of action. Metformin has a number of actions within the gut. It increases intestinal glucose uptake and lactate production, increases GLP-1 concentrations and the bile acid pool within the intestine, and alters the microbiome. A novel delayed-release preparation of metformin has recently been shown to improve glycaemic control to a similar extent to immediate-release metformin, but with less systemic exposure. We believe that metformin response and tolerance is intrinsically linked with the gut. This review examines the passage of metformin through the gut, and how this can affect the efficacy of metformin treatment in the individual, and contribute to the side effects associated with metformin intolerance.
Indexed as
Identifiers
What OpenQuestion holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.