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 11Moderate evidence 15Low evidence 7Very low evidence 3
CagriSemaINVESTIGATIONAL
Stomach and gutIncrease
High evidence
In the T2D registrational trial, CagriSema roughly doubled gastrointestinal adverse events versus placebo (72.5% vs 34.4%), mostly transient.
SourceDavies MJ, Bajaj HS, et al. N Engl J Med 2025 (REDEFINE 2)Source
PopulationPeer-reviewed RCT / meta-analysis
Fundingindustry-Novo Nordisk
CagriSemaINVESTIGATIONAL
Stomach and gutIncrease
High evidence
GI AEs much more frequent than placebo, mainly transient and mild-to-moderate; GI-specific discontinuation modest.
SourceGarvey 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
Across the roster, GI AEs cluster during dose escalation and are partially mitigated by slower/lower-starting-dose titration; explicit titration-mitigation evidence...
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-agentSTATUS UNKNOWN
Stomach and gutIncrease
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...
SourceKateel 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-agentSTATUS UNKNOWN
Stomach and gutIncrease
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...
SourceWharton 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-agentSTATUS UNKNOWN
Stomach and gutNot 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...
SourceSehgal 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.
Fundingacademic/independent analysis (manufacturer not study sponsor; per-study COI not individually audited)
GLP-1-based therapies, multi-agentSTATUS UNKNOWN
Stomach and gutNot 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,...
SourceNo 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)
DulaglutideMARKETED
Stomach and gutIncrease
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...
SourceLudvik 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
DulaglutideMARKETED
Stomach and gutNo 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.
SourceDungan KM, Povedano ST, Forst T, et al. Once-weekly dulaglutide versus once-daily liraglu...Source
GI AEs most common, mostly mild-to-moderate, concentrated in escalation; per-symptom rates and AE-related discontinuation dose-related.
SourceLilly ATTAIN-1 (NEJM 2025) and ATTAIN-2 resultsSource
PopulationATTAIN-1: adults with obesity (no diabetes); phase 3 RCT, orforglipron 6/12/36 mg vs placebo
Fundingindustry - Eli Lilly
Comparatorsplacebo
OrforglipronMARKETED
Stomach and gutIncrease
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...
SourcePillai 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
RetatrutideINVESTIGATIONAL
Stomach and gutIncrease
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.
SourceJastreboff AM et al. (retatrutide phase 2), NEJM, 2023;389:514-526Source
GI effects (esp. nausea, vomiting) most frequent AEs across the PIONEER programme; mild-to-moderate, faded with time. PIONEER 1 trial-product discontinuations...
SourceAroda 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
SemaglutideMARKETED
Stomach and gutIncrease
High evidence
Nausea and diarrhoea most common AEs; transient, mild-to-moderate. More semaglutide than placebo participants discontinued for GI events.
SourceWilding JPH et al., NEJM 2021 (STEP 1)Source
GI AEs (nausea, diarrhoea, vomiting) markedly more frequent than placebo; dose-dependent, titration-managed; high AE-related discontinuation, mainly GI.
SourceSanyal et al., Phase 2 Survodutide in MASH and Fibrosis, NEJM 2024; Boehringer phase 3 pressSource
Fundingindustry - Boehringer Ingelheim (disclosed in publication)
Comparatorsplacebo
TirzepatideMARKETED
Stomach and gutIncrease
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...
SourceJuxtaposition 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).