Evidence reference only. Not medical advice, not a dosing guide, and not a recommendation to use any drug.
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Stomach and gut

36 findings across 25 drug records. Domain pages are descriptive indexes, not advice.

The grade rates how strong the evidence is, not how good or safe the drug is. A low or very-low grade means the evidence is thin, not that an effect is harmful or ruled out.

Most represented records

GLP-1-based therapies, multi-agent (5)

Orforglipron (4)

CagriSema (2)

Dulaglutide (2)

Semaglutide (2)

Survodutide (2)

Aleniglipron (1)

Amycretin (1)

Evidence spread

High evidence 11 Moderate evidence 15 Low evidence 7 Very low evidence 3

CagriSema INVESTIGATIONAL
Stomach and gut Increase
High evidence

In the T2D registrational trial, CagriSema roughly doubled gastrointestinal adverse events versus placebo (72.5% vs 34.4%), mostly transient.

Davies MJ, Bajaj HS, et al. N Engl J Med 2025 (REDEFINE 2) Source
PopulationPeer-reviewed RCT / meta-analysis
Fundingindustry-Novo Nordisk
CagriSema INVESTIGATIONAL
Stomach and gut Increase
High evidence

GI AEs much more frequent than placebo, mainly transient and mild-to-moderate; GI-specific discontinuation modest.

Garvey WT, Blüher M, et al. N Engl J Med 2025 (REDEFINE 1) Source
PopulationREDEFINE 1: 3417 adults overweight+complication or obesity, no diabetes; 68 weeks; phase 3a RCT
Fundingindustry-Novo Nordisk
Comparatorssemaglutide 2.4 mg; cagrilintide 2.4 mg; placebo
GLP-1-based therapies, multi-agent STATUS UNKNOWN
Stomach and gut Decrease
Moderate evidence

Across the roster, GI AEs cluster during dose escalation and are partially mitigated by slower/lower-starting-dose titration; explicit titration-mitigation evidence...

Synthesis: Jastreboff 2022, Jastreboff 2023, ATTAIN-1, survodutide phase 2 Source
Full findingAcross the roster, GI AEs cluster during dose escalation and are partially mitigated by slower/lower-starting-dose titration; explicit titration-mitigation evidence strongest for retatrutide (2 vs 4 mg start), stated for orforglipron and survodutide.
PopulationSynthesis across SURMOUNT-1, retatrutide phase 2, ATTAIN-1, survodutide phase 2
Fundingindustry - multiple, each disclosed per component: Eli Lilly / Boehringer Ingelheim
Comparatorsplacebo
GLP-1-based therapies, multi-agent STATUS UNKNOWN
Stomach and gut Increase
Moderate evidence

GLP-1 RAs added to insulin in T1D roughly tripled nausea and vomiting and doubled early treatment withdrawal - a substantial early gastrointestinal burden that eases...

Kateel R, Parida A, Chogtu B, Holla SN. Safety of GLP-1 receptor agonists in type 1 diabe... Source
Full findingGLP-1 RAs added to insulin in T1D roughly tripled nausea and vomiting and doubled early treatment withdrawal - a substantial early gastrointestinal burden that eases after about six months, requiring slow dose titration and careful patient selection.
PopulationGLP-1 RA T1D safety/tolerability meta-analyses (Kateel et al., 25 studies; corroborated by Tan et al. GI-AE OR 2.96, PMC10797415).
Fundingacademic/government (Kasturba Medical College, Manipal; Dept of Health Research, India)
Comparatorsplacebo (insulin background)
GLP-1-based therapies, multi-agent STATUS UNKNOWN
Stomach and gut Increase
Moderate evidence

FOLK-CLAIM VERDICTS (GI cluster): (1) 'Nausea is near-inevitable' = OVERSTATED - real and the top AE but ~25-44% (not inevitable), mostly mild-moderate, concentrated...

Wharton S et al. Gastrointestinal tolerability of semaglutide 2.4 mg (pooled STEP 1-3). D... Source
Full findingFOLK-CLAIM VERDICTS (GI cluster): (1) 'Nausea is near-inevitable' = OVERSTATED - real and the top AE but ~25-44% (not inevitable), mostly mild-moderate, concentrated at titration. (2) 'Constipation is more common than diarrhoea' = FALSE/MIXED - for semaglutide diarrhoea (29.7%) >= constipation (24.2%), and the balance is DRUG-SPECIFIC (sema/lira constipation-leaning, tirzepatide diarrhoea-leaning). (3) 'Fatigue, especially after each dose increase' = TRUE as a recognised (labelled) AE, but the per-step-spike mechanism is OVERSTATED - fatigue is largely secondary to reduced intake/dehydration/electrolytes during the nausea-prone escalation window, not a proven per-step pharmacological effect.
PopulationPooled STEP 1-3 (semaglutide) GI-tolerability analysis + SURMOUNT (tirzepatide) + a class network meta-analysis.
Fundingindustry - Novo Nordisk A/S (sponsor of the underlying STEP 1-3 trials and the load-bearing Wharton 2022 pooled GI-tolerability analysis)
Comparatorsplacebo
GLP-1-based therapies, multi-agent STATUS UNKNOWN
Stomach and gut Not directional
Very low evidence

REAL-WORLD ONLINE SELF-REPORT context for the GI/other folk frequencies. This is a SIGNAL-DETECTION / pharmacovigilance-adjacent dataset, NOT prevalence, NOT...

Sehgal NKR, Tronieri J, Ungar L, Guntuku SC. Self-reported side effects of semaglutide an... Source
Full findingREAL-WORLD ONLINE SELF-REPORT context for the GI/other folk frequencies. This is a SIGNAL-DETECTION / pharmacovigilance-adjacent dataset, NOT prevalence, NOT incidence, NOT causal - self-selected communities, no denominator, no controls, no titration timing (the authors state they cannot say GLP-1s cause these symptoms). Use it to gauge how COMMON a BELIEF/report is, never to estimate true rates. The sema-vs-tirz nausea split is a text-mining ratio, not a randomised comparison.
PopulationSelf-selected online communities (Reddit); semaglutide + tirzepatide users; computational NLP classification.
Fundingacademic/independent analysis (manufacturer not study sponsor; per-study COI not individually audited)
GLP-1-based therapies, multi-agent STATUS UNKNOWN
Stomach and gut Not directional
Low evidence

FOLK-CLAIM VERDICT ('sulfur burps' / rotten-egg belches): UNPROVEN - this is the clearest GENUINE EVIDENCE GAP in the GI cluster. The phenomenon is a widespread,...

No indexed literature on GLP-1-associated sulfur eructation/hydrogen-sulfide belching loc...
Full findingFOLK-CLAIM VERDICT ('sulfur burps' / rotten-egg belches): UNPROVEN - this is the clearest GENUINE EVIDENCE GAP in the GI cluster. The phenomenon is a widespread, recognisable community 'class signal' with a plausible mechanism (delayed gastric emptying -> fermentation -> hydrogen sulfide), but there is NO trial, case series or mechanistic paper formally characterising or quantifying it. Real-world reports + coherent mechanism, but no formal evidence base.
Populationn/a - documents the absence of formal literature; online self-report (eructation ~6.9%) is the only frequency anchor.
Fundingacademic/independent analysis (manufacturer not study sponsor; per-study COI not individually audited)
Dulaglutide MARKETED
Stomach and gut Increase
High evidence

Across the AWARD programme, dulaglutide's most common adverse events are gastrointestinal (nausea, diarrhoea, vomiting), dose-related and mostly mild-to-moderate and...

Ludvik B, Frias JP, Tinahones FJ, et al. Dulaglutide as add-on therapy to SGLT2 inhibitor... Source
Full findingAcross the AWARD programme, dulaglutide's most common adverse events are gastrointestinal (nausea, diarrhoea, vomiting), dose-related and mostly mild-to-moderate and transient, with low study-drug discontinuation.
PopulationAWARD programme phase-3 double-blind randomised trials: AWARD-10 (N=424, vs placebo, on SGLT2i) and the open-label AWARD-6 (N=599, vs liraglutide, on metformin); GI adverse-event incidence and discontinuation.
Fundingindustry - Eli Lilly (trial sponsor; inferred from registration trial)
Comparatorsplacebo; liraglutide
Dulaglutide MARKETED
Stomach and gut No change
Moderate evidence

In the AWARD-6 head-to-head, study or study-drug discontinuation because of adverse events was the same for once-weekly dulaglutide and once-daily liraglutide.

Dungan KM, Povedano ST, Forst T, et al. Once-weekly dulaglutide versus once-daily liraglu... Source
PopulationAWARD-6: phase-3 open-label non-inferiority randomised trial, N=599; metformin-treated type 2 diabetes; dulaglutide 1.5 mg weekly vs liraglutide 1.8 mg daily; 26 weeks.
Fundingindustry - Eli Lilly (trial sponsor; inferred from registration trial)
Comparatorsliraglutide
Liraglutide MARKETED
Stomach and gut Increase
High evidence

GI AEs more frequent than placebo, largely mild-to-moderate, transient, in escalation; AE-related discontinuation higher than placebo.

Pi-Sunyer X et al., N Engl J Med 2015 (SCALE) Source
PopulationSCALE Obesity and Prediabetes: 3731 adults BMI>=30 (or >=27+comorbidity); liraglutide 3.0 mg daily vs placebo
Fundingindustry - Novo Nordisk (disclosed in publication)
Comparatorsplacebo
Orforglipron MARKETED
Stomach and gut Increase
High evidence

In a weight-maintenance setting (after injectable tirzepatide or semaglutide), most common AEs with orforglipron were GI, mostly mild-to-moderate.

Aronne LJ et al., Nat Med 2026 (ATTAIN-MAINTAIN) Source
PopulationATTAIN-MAINTAIN: 376 adults (205 prior tirzepatide; 171 prior semaglutide); 52 weeks; phase 3b RCT, orforglipron daily vs placebo
Fundingindustry-Eli Lilly
Comparatorsplacebo
Orforglipron MARKETED
Stomach and gut Increase
High evidence

GI AEs most common, mostly mild-to-moderate, concentrated in escalation; per-symptom rates and AE-related discontinuation dose-related.

Lilly ATTAIN-1 (NEJM 2025) and ATTAIN-2 results Source
PopulationATTAIN-1: adults with obesity (no diabetes); phase 3 RCT, orforglipron 6/12/36 mg vs placebo
Fundingindustry - Eli Lilly
Comparatorsplacebo
Orforglipron MARKETED
Stomach and gut Increase
Low evidence

Review-channel: safety profile consistent with GLP-1 class, dominated by manageable GI events mitigated by slow escalation; small mild-pancreatitis signal noted...

Pillai AA et al., Cardiol Rev 2025 (orforglipron review) Source
Full findingReview-channel: safety profile consistent with GLP-1 class, dominated by manageable GI events mitigated by slow escalation; small mild-pancreatitis signal noted (logged as class context).
PopulationACHIEVE-3 (T2D) and ATTAIN-2 (obesity+T2D) programme; phase 3
Fundingacademic/independent analysis (manufacturer not study sponsor; per-study COI not individually audited)
Comparatorsoral semaglutide; placebo
Retatrutide INVESTIGATIONAL
Stomach and gut Increase
Moderate evidence

GI AEs most common, dose-related, mostly mild-to-moderate; partially mitigated by a lower 2 mg (vs 4 mg) starting dose. Nausea showed a clear dose gradient.

Jastreboff AM et al. (retatrutide phase 2), NEJM, 2023;389:514-526 Source
PopulationRetatrutide phase 2: 338 adults with obesity; 48 weeks; phase 2 RCT
Fundingindustry-Eli Lilly
Comparatorsplacebo
Semaglutide MARKETED
Stomach and gut Increase
High evidence

GI effects (esp. nausea, vomiting) most frequent AEs across the PIONEER programme; mild-to-moderate, faded with time. PIONEER 1 trial-product discontinuations...

Aroda VR et al., Diabetes Care 2019 (PIONEER 1) Source
Full findingGI effects (esp. nausea, vomiting) most frequent AEs across the PIONEER programme; mild-to-moderate, faded with time. PIONEER 1 trial-product discontinuations dose-related.
PopulationPIONEER 1: 703 adults with T2D on diet/exercise; 26 weeks; phase 3a RCT, oral semaglutide 3/7/14 mg vs placebo
Fundingindustry-Novo Nordisk
Comparatorsplacebo
Semaglutide MARKETED
Stomach and gut Increase
High evidence

Nausea and diarrhoea most common AEs; transient, mild-to-moderate. More semaglutide than placebo participants discontinued for GI events.

Wilding JPH et al., NEJM 2021 (STEP 1) Source
PopulationSTEP 1: 1961 adults, overweight/obesity, no diabetes; 68 weeks; double-blind RCT
Fundingindustry - Novo Nordisk
Comparatorsplacebo
Survodutide INVESTIGATIONAL
Stomach and gut Increase
Moderate evidence

GI AEs (nausea, diarrhoea, vomiting) markedly more frequent than placebo; dose-dependent, titration-managed; high AE-related discontinuation, mainly GI.

Sanyal et al., Phase 2 Survodutide in MASH and Fibrosis, NEJM 2024; Boehringer phase 3 press Source
PopulationSurvodutide phase 2 (obesity/MASH); 48 weeks; s.c. 2.4/4.8/6.0 mg weekly vs placebo
Fundingindustry - Boehringer Ingelheim (disclosed in publication)
Comparatorsplacebo
Tirzepatide MARKETED
Stomach and gut Increase
High evidence

GI AEs most common, mostly mild-to-moderate, primarily during dose escalation; AE-related discontinuation dose-related. Per-symptom rates broadly dose-related (nausea...

Juxtaposition of SURMOUNT-1 (NEJM 2022) and MariTide phase 2 (ADA 2025); see also LY35370... Source
Full findingGI AEs most common, mostly mild-to-moderate, primarily during dose escalation; AE-related discontinuation dose-related. Per-symptom rates broadly dose-related (nausea peaks at 10 mg).
PopulationSURMOUNT-1: 2539 adults with obesity; 72 weeks (20-wk escalation); phase 3 RCT
Fundingindustry - Eli Lilly (SURMOUNT-1; disclosed)
Comparatorsplacebo
Tirzepatide and semaglutide comparison STATUS UNKNOWN
Stomach and gut Mixed
Moderate evidence

SURMOUNT-5 head-to-head: GI AEs most common with both; GI-AE-driven discontinuation occurred more often with semaglutide than tirzepatide.

Aronne LJ et al., SURMOUNT-5, N Engl J Med 2025 Source
PopulationSURMOUNT-5: 751 adults with obesity, no diabetes; 72 weeks; phase 3b open-label; max-tolerated tirzepatide 10/15 mg vs semaglutide 1.7/2.4 mg
Fundingindustry - Eli Lilly (disclosed in publication)
Comparatorssemaglutide
Aleniglipron INVESTIGATIONAL
Stomach and gut Increase
Moderate evidence

GI events generally mild-to-moderate and decreased over time; treatment-related discontinuations modest.

Rosenstock J et al. Oral small molecule GLP-1 receptor agonist aleniglipron in people wit... Source
PopulationACCESS phase 2b N=230 (NCT06693843); 36 wk; placebo comparator
Fundingindustry - Structure Therapeutics (via subsidiary Gasherbrum Bio, Inc.)
Comparatorsplacebo
Amycretin INVESTIGATIONAL
Stomach and gut Increase
Low evidence

Predominantly GI TEAEs, mild-to-moderate, dose-dependent; all resolved

Dahl K, Toubro S et al. Amycretin, unimolecular GLP-1 and amylin receptor agonist s.c.: p... Source
Populations.c. phase 1b/2a (n=125) and oral phase 1 (n=144)
Fundingindustry - Novo Nordisk (trial sponsor; inferred from registration trial)
Comparatorsplacebo
Cagrilintide INVESTIGATIONAL
Stomach and gut Increase
Moderate evidence

GI disorders and injection-site reactions most frequent; more than placebo

Lau DCW et al. Lancet 2021;398:2160-2172 Source
PopulationOverweight/obese (n=706), phase 2, 26 wk
Fundingindustry - Novo Nordisk
Comparatorsplacebo; liraglutide 3.0 mg
Cotadutide DISCONTINUED
Stomach and gut Increase
Moderate evidence

GI adverse events (nausea, vomiting) most common; decreased over time

Nahra R et al. Diabetes Care 2021;44:1433-1442 Source
PopulationOverweight/obese T2D, phase 2a & 2b
Fundingindustry-AstraZeneca
Comparatorsplacebo; liraglutide 1.8 mg
Enicepatide INVESTIGATIONAL
Stomach and gut Increase
Low evidence

Generally well tolerated; GI adverse events mostly mild-to-moderate, consistent with incretin class.

Chakravarthy MV et al. Effects of CT-388, a once-weekly signaling-biased dual GLP-1/GIP r... Source
PopulationPhase 1 (NCT04838405) and phase 2 CT388-103 (N=469)
Fundingindustry - Roche
Comparatorsplacebo
Danuglipron DISCONTINUED
Stomach and gut Increase
Moderate evidence

High GI adverse-event burden, dose-related, driving high discontinuation.

Buckeridge C et al. Efficacy and safety of danuglipron (PF-06882961) in adults with obesi... Source
PopulationPhase 2b N=628 (NCT04707313); 26/32 wk; placebo comparator
Fundingindustry - Pfizer
Comparatorsplacebo
Ecnoglutide MARKETED
Stomach and gut Increase
Moderate evidence

Most adverse events mild-to-moderate GI; few discontinuations.

Ji L et al. Efficacy and safety of a biased GLP-1 receptor agonist ecnoglutide in adults ... Source
PopulationPhase 3 N=664 (NCT05813795); 40 wk; placebo comparator
Fundingindustry - Hangzhou Sciwind Biosciences (trial sponsor, disclosed in publication)
Comparatorsplacebo
Efinopegdutide INVESTIGATIONAL
Stomach and gut Increase
Moderate evidence

Slightly higher AEs vs semaglutide, mainly GI

Romero-Gómez M et al. A phase IIa active-comparator-controlled study to evaluate the effi... Source
PopulationNAFLD (n=145), phase 2a, 24 wk
Fundingindustry-Merck (Merck Sharp & Dohme LLC; efinopegdutide licensed from Hanmi)
Comparatorssemaglutide 1 mg
LY3537021 INVESTIGATIONAL
Stomach and gut No change
Low evidence

Well tolerated with infrequent gastrointestinal adverse events.

Long-acting GIPR agonist LY3537021 reduces body weight and fasting glucose in T2D: precli... Source
PopulationPhase 1 SAD/MAD N=85; placebo comparator
Fundingindustry - Eli Lilly (trial sponsor; inferred from registration trial)
Comparatorsplacebo
MariTide INVESTIGATIONAL
Stomach and gut Increase
Moderate evidence

Gastrointestinal adverse events common but mitigated by lower starting dose and dose escalation.

Jastreboff AM et al. Once-Monthly Maridebart Cafraglutide for the Treatment of Obesity - ... Source
PopulationFull phase 2 population N=592; 52 wk; placebo comparator
Fundingindustry - Amgen
Comparatorsplacebo
Mazdutide MARKETED
Stomach and gut Increase
Low evidence

Mild-to-moderate GI TEAEs; no serious AEs in phase 1b

Ji L et al. EClinicalMedicine 2022;54:101691 Source
PopulationChinese overweight/obese (n=24), phase 1b
Fundingindustry - Innovent / Eli Lilly (trial sponsor; inferred from registration trial)
Comparatorsplacebo
Orforglipron MARKETED
Stomach and gut Increase
High evidence

Predominantly mild-to-moderate GI adverse events, mostly during dose escalation; higher AE-related discontinuation than placebo/active comparators.

Horn DB et al. Orforglipron... for obesity in people with type 2 diabetes (ATTAIN-2): a p... Source
PopulationPooled across ATTAIN-2, ACHIEVE-1, ACHIEVE-2 phase 3 RCTs
Fundingindustry-Eli Lilly
Comparatorsplacebo; dapagliflozin
Pemvidutide INVESTIGATIONAL
Stomach and gut Increase
Low evidence

Well tolerated in MASLD study with no severe/serious AEs

Harrison SA et al. J Hepatol 2024;82:7-17 Source
PopulationMASLD phase 1b/2a (n=94), 12 wk
Fundingindustry - Altimmune (trial sponsor; inferred from registration trial)
Comparatorsplacebo
Petrelintide INVESTIGATIONAL
Stomach and gut No change
Very low evidence

Reported safe and well tolerated at all dose levels (company)

Zealand Pharma topline press release, 20 Jun 2024 Source
PopulationPhase 1b MAD (n=48), 16 wk
Fundingindustry - Zealand / Roche (trial sponsor; inferred from registration trial)
Comparatorsplacebo
Pramlintide DISCONTINUED
Stomach and gut Increase
High evidence

Nausea most common AE; slows gastric emptying

SYMLIN FDA label 2015 Source
PopulationT1D/T2D registration trials
Fundingregulatory agency (FDA/EMA/MHRA/WHO)
Comparatorsplacebo + insulin
Survodutide INVESTIGATIONAL
Stomach and gut Increase
Moderate evidence

GI events dominant; higher than placebo

Sanyal AJ et al. A Phase 2 Randomized Trial of Survodutide in MASH and Fibrosis. N Engl J... Source
PopulationMASH (n=293) and obesity (n=387) phase 2 trials
Fundingindustry - Boehringer Ingelheim / Zealand
Comparatorsplacebo
TERN-601 DISCONTINUED
Stomach and gut Increase
Very low evidence

AE-related discontinuation in phase 2 higher than the favourable phase 1 profile suggested.

Terns Pharmaceuticals press release, 21 Oct 2025. Source
PopulationFALCON phase 2 (n=30 per active cohort + placebo)
Fundingindustry - Terns (trial sponsor; inferred from registration trial)
Comparatorsplacebo