Tirzepatide Side Effects: Labels and What Users Report
Tirzepatide side effects (Mounjaro, Zepbound): label warnings and what 92 anonymous users report. Phrase matches, not clinical rates. Not medical advice.
Anonymous user report. Not medical advice. Peptides discussed are not FDA-approved for the uses described. Editorial process →
Short answer
Tirzepatide is the active ingredient in Mounjaro and Zepbound. Side effects centre on the gastrointestinal tract, with serious label warnings that include pancreatitis, gallbladder disease, kidney injury from dehydration, hypoglycaemia with certain diabetes drugs, hypersensitivity, and a boxed thyroid C-cell tumour warning from rodent data. Peptide Confessions does not publish dosing, timing, injection or sourcing guidance.
Brand pages vs this molecule page
Searchers often use brand names: Mounjaro side effects and Zepbound side effects. The live count tables are on the tirzepatide side-effects report (92 published confessions).
Trial rates at a glance
Rounded, highest dose vs placebo. Last reviewed October 15, 2026.
| Side effect | SURMOUNT-1 (weight, 72 wk) | SURPASS (diabetes trials) |
|---|---|---|
| Nausea | About 31% vs 10% | Roughly 12–18% |
| Diarrhoea | About 23% vs 7% | Roughly 12–17% |
| Vomiting | About 12% vs 2% | Under 10% |
| Constipation | About 12% vs 6% | Under 10% |
What users report
Burping and GI upset lead (#190, #276). #290 describes a racing heart and low blood pressure ending in the ER; #61 misread a syringe and spent 36 hours vomiting; #422 reports low libido. Positive surprises appear too: fewer migraines (#105) and reflux that resolved after a rough first week (#308).
Serious risks and who should avoid it
Tirzepatide labels say not to use it with a personal or family history of medullary thyroid carcinoma or MEN 2, or with a past serious allergic reaction to it. Extra caution is advised with a history of pancreatitis, severe gastrointestinal disease such as gastroparesis, kidney problems (vomiting and diarrhoea can cause dehydration), or diabetic retinopathy. It is not recommended in pregnancy. Because it slows stomach emptying, surgical and anaesthesia teams should know you take it.
Interactions people miss
Oral contraceptives may be less effective for about four weeks after starting and after each dose increase; the label advises switching to a non-oral method or adding a barrier method during those periods. Insulin and sulfonylureas raise the risk of low blood sugar. It shouldn't be combined with other GLP-1 drugs. See also facial volume loss and hair shedding after rapid weight loss.
When to get medical help
Severe abdominal pain that won't go away, pain under the right ribs or yellowing skin, vomiting that stops you keeping fluids down, little or no urine, swelling of the face or throat, a lump in the neck, or a racing heart at rest.
Compared with semaglutide
Different molecule (GLP-1+GIP vs GLP-1 alone) with overlapping GI tolerability themes. See semaglutide vs tirzepatide.
Related topics
related peptides:
community guides:
More confessions from the archive
Community Q&A
- Does tirzepatide affect birth control?
- Yes, it can reduce oral contraceptive absorption for about four weeks after starting and after each dose increase. The label advises a non-oral or backup method.
- Does tirzepatide raise heart rate?
- A small average rise in resting heart rate was seen in trials. A persistently racing heart should be checked by a clinician.
- Who should not take tirzepatide?
- People with a personal or family history of medullary thyroid cancer or MEN 2, or a prior serious allergic reaction to it. Pregnancy and some gut, kidney or pancreas conditions need special caution.
- Do tirzepatide side effects go away?
- GI effects often ease after the first weeks and after each dose step settles, though not for everyone.
- What are common tirzepatide side effects?
- Labels emphasise gastrointestinal effects such as nausea, diarrhoea, vomiting, constipation and abdominal pain.
- Is tirzepatide the same as Mounjaro or Zepbound?
- Yes — those are brand names for tirzepatide with different labelled uses.
- How many user reports?
- Our tirzepatide side-effects report uses 92 published anonymous confessions.
- Does this page give dosing advice?
- Peptide Confessions does not publish dosing, timing, injection or sourcing guidance.
Sources
Anonymous first-hand reports plus sourced context — educational only, not medical advice. Editorial policy & corrections.