Mounjaro Belching Smells Like Rotten Eggs — Common Side Effect

This Is a Common Side Effect — Mounjaro Does Cause Sulfuric Burps

When your belching starts smelling like sewage after starting Mounjaro, this is among the most widely reported side effects of GLP-1 medications.

What You Need to Know

• It’s extremely common
• The smell is H2S — the same gas in rotten eggs
• Most people see it resolve within 4-8 weeks
• You don’t have to just suffer through it
• It’s unpleasant but not harmful

What Makes It So Awful

Hydrogen sulfide (H2S) is detectable by the human nose at vanishingly small amounts. Just a trace of H2S produces an overwhelming stink. Humans evolved to detect it because it’s associated with toxic environments — so even a small amount.

Treatment Options

Immediate Relief

Pepto-Bismol is the #1 product for neutralizing the odor because it directly neutralizes hydrogen sulfide — a chemical solution to a chemical problem.

Activated Charcoal (Nature’s Way) — adsorbs sulfur compounds. Between-meal dosing is key. Space from prescriptions.

Stopping It Before It Starts

Digestive Enzymes (American Health Papaya) — take with every meal. Cuts off the supply chain for sulfur production.

Probiotics (Align) — take each morning. The slow game — but addresses the root cause.

Dietary Adjustments

Minimize these during the worst period:

• Eggs, notably whole eggs
• Steak, burgers, sausage
• Cruciferous vegetables
• Garlic and onions

Eat more of:

• White rice, potatoes, bread
• Lower-sulfur proteins
• Bananas, applesauce

Together of food modification and supplements typically resolves sulfur burps within 2-4 weeks on Mounjaro.