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Why am I getting awful sulfur burps and diarrhea on my GLP-1?

Updated 2026-05-03

Sulfur burps - the rotten-egg taste - happen because GLP-1 drugs slow your stomach down. Food, especially red meat and fatty food, sits in your gut longer and starts to ferment. Bacteria release hydrogen sulfide gas, which is what tastes like sulfur. The diarrhea that often follows is your body finally clearing what was stuck. It is unpleasant but not dangerous. Diet changes, magnesium, and avoiding heavy meats the day before your shot fix it for most people.

IfIf sulfur burps hit the day after your shot
Thenthen eat lighter and lower-fat for 24 hours before and after your injection - skip red meat and pork
IfIf you are also constipated leading up to it
Thenthen add daily magnesium citrate or Miralax - clearing the backup usually stops the gas
IfIf burps come with severe stomach pain that wraps to your back
Thenthen stop and contact a doctor right away - this can signal pancreatitis, which is a known boxed warning
IfIf they keep happening every week despite diet changes
Thenthen your dose may be too high for your gut - a step-down to the previous level is reasonable
Key facts
  • GLP-1 drugs slow gastric emptying - food can sit in your stomach hours longer than normal
  • Hydrogen sulfide gas comes from sulfur-rich foods fermenting (eggs, red meat, cruciferous vegetables, garlic)
  • Constipation is the single most reported side effect on tirzepatide and semaglutide
  • Pepto-Bismol (bismuth subsalicylate) binds hydrogen sulfide and reduces sulfur burps for many users
  • Pancreatitis is rare but listed in a boxed warning on the prescribing label - severe upper abdominal pain radiating to the back is the warning sign
  • Symptoms usually peak after dose escalations and ease as your body adjusts
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