Semaglutide vs. Tirzepatide: Which GLP-1 Is Right for You?

How each medication works

Semaglutide is a GLP-1 receptor agonist. It mimics a hormone your gut naturally releases after eating, which slows stomach emptying, reduces appetite, and helps regulate blood sugar.

Tirzepatide works on two hormone receptors instead of one — GLP-1 and GIP (glucose-dependent insulinotropic polypeptide). Activating both pathways appears to produce a stronger effect on appetite regulation and metabolic function than targeting GLP-1 alone.

Comparing average results

In clinical trials, participants on tirzepatide generally lost a greater percentage of body weight on average compared to those on semaglutide, at comparable trial durations. That said, trial averages describe a population, not an individual — genetics, starting weight, diet, activity level, and consistency with dosing all shape real-world results.

Side effects to know about

Both medications share a similar side effect profile, since they act on overlapping digestive pathways. The most common effects reported include:

• Nausea, especially during dose increases
• Reduced appetite
• Mild digestive changes (constipation or diarrhea)
• Occasional fatigue in the first few weeks

These effects tend to be most noticeable during dose titration and typically ease as your body adjusts. Your provider manages your titration schedule specifically to keep side effects manageable.

How dosing works

Both medications are given as a once-weekly subcutaneous injection, and both start at a low dose that's gradually increased over several weeks to months. This slow titration is the single biggest factor in how comfortable your experience is — rushing it tends to increase side effects without speeding up results.