Retatrutide Side Effects vs Semaglutide: Comparison

Comparing retatrutide and semaglutide side effects reveals a surprising finding: despite activating three receptors instead of one, retatrutide does not appear to be significantly harder to tolerate. In fact, retatrutide's nausea rate (26%) was notably lower than semaglutide's (~44% in STEP trials), and overall discontinuation rates were comparable (Jastreboff et al., NEJM 2023; Wilding et al., NEJM 2021). The addition of GIP and glucagon receptors may actually moderate the pure GLP-1 GI side effects.

Side Effect Comparison Table

Why Retatrutide May Be Easier on the GI Tract

The addition of GIP and glucagon receptors may modulate the GI effects of pure GLP-1 agonism. GIP receptor activation has been shown to have anti-emetic (anti-nausea) properties in some studies, which may partially counteract GLP-1-driven nausea. The result: a drug that produces 60% more weight loss than semaglutide with lower GI side effect rates.

Retatrutide's Unique Side Effects

The trade-off for lower GI side effects is the addition of glucagon-specific effects: dysesthesia (20.9% at 12mg), slightly greater heart rate increase, and potential liver enzyme elevation. These are generally mild and transient, but they represent a different side effect profile that patients switching from semaglutide should expect.

Treatment Options

Trimi offers compounded semaglutide at $99/month and compounded tirzepatide at $125/month. If semaglutide side effects are problematic, tirzepatide may be better tolerated (and more effective). Get started with Trimi.

Frequently Asked Questions

Does retatrutide cause more nausea than semaglutide?

No. Phase 2 data shows lower nausea rates for retatrutide (26%) compared to semaglutide (~44%). However, direct head-to-head data is needed for definitive comparison.

If I couldn't tolerate semaglutide, will I tolerate retatrutide?

Possibly better. The different receptor balance may produce fewer GI side effects. However, dysesthesia from the glucagon component would be a new consideration. Discuss with your provider.

Which drug has the lowest discontinuation rate?

Retatrutide and semaglutide have comparable discontinuation rates (~6-7%). Despite different side effect profiles, overall tolerability is similar.

Should I switch from semaglutide to tirzepatide for fewer side effects?

Many patients report better GI tolerance with tirzepatide compared to semaglutide. Trimi offers compounded tirzepatide at $125/month if you want to explore this option.