Peptide Sherpa

What’s the Difference?

If you’ve started researching GLP-1 weight loss injections, you’ve almost certainly come across two names: semaglutide and tirzepatide. Both are prescription medications used for weight loss, both are administered as weekly injections, and both have impressive clinical results. But they work differently — and for some people, that difference matters a lot.

How Semaglutide Works

Semaglutide is a GLP-1 receptor agonist. GLP-1 (glucagon-like peptide-1) is a hormone your gut naturally releases after eating. It signals your brain that you’re full, slows digestion, and reduces appetite. Semaglutide mimics this hormone, keeping those signals active longer than your body naturally would.

The result: you feel satisfied with smaller portions, experience fewer cravings, and naturally eat less without white-knuckling your way through hunger.

Brand names you may recognize: Ozempic (originally for diabetes) and Wegovy (approved for weight loss).

How Tirzepatide Works

Tirzepatide takes things a step further. It’s a dual GIP/GLP-1 receptor agonist — meaning it activates two hormonal pathways instead of one. GIP (glucose-dependent insulinotropic polypeptide) is another gut hormone that works alongside GLP-1 to regulate appetite and metabolism.

By targeting both receptors, tirzepatide appears to produce stronger appetite suppression and, in clinical trials, greater average weight loss than semaglutide alone.

Brand names: Mounjaro (originally for diabetes) and Zepbound (approved for weight loss).

How Do the Results Compare?

Clinical trials paint a clear picture:

Semaglutide (STEP trials): Participants lost an average of ~15% of body weight over 68 weeks at the 2.4mg weekly dose.

Tirzepatide (SURMOUNT trials): Participants lost an average of ~20–22% of body weight over 72 weeks at the highest dose (15mg weekly).

That gap is meaningful — but it’s an average across thousands of people. Individual results vary based on starting weight, metabolic factors, diet, and how your body responds to each medication.

Side Effects: Are They Different?

Both medications share similar side effect profiles, since they both affect the GLP-1 pathway:

• Nausea (most common, especially in the first few weeks)
• Vomiting
• Constipation or diarrhea
• Fatigue
• Reduced appetite (this one’s intentional)

Side effects typically peak during dose escalation and ease off as your body adjusts. Starting at a low dose and titrating up slowly — which your prescribing provider should guide you through — helps significantly.

Some research suggests tirzepatide may cause slightly more GI side effects due to the dual mechanism, though this varies by individual.

Which One Is Right for You?

There’s no universal answer, but here’s a useful framework:

Consider semaglutide if:

• You want a well-established option with years of real-world data
• You’ve been advised to start with a single-pathway GLP-1
• Cost or insurance coverage is a factor (semaglutide has been on the market longer)

Consider tirzepatide if:

• You want the option with the highest average weight loss in trials
• You’ve tried semaglutide with limited results
• Your provider thinks dual-agonist therapy is appropriate for your profile

The most important factor? Talking to a licensed provider who can evaluate your specific situation. Both medications require a prescription, and the right choice depends on your health history, goals, and how your body responds.

Getting Started

If you’re ready to explore GLP-1 therapy, telehealth has made the process faster and more accessible than ever. You can complete an intake form online, connect with a licensed provider, and — if appropriate — receive your prescription delivered to your door.

BreezeMeds offers both semaglutide and tirzepatide programs, with GLP-1 injections starting at $199/month. Their medical team can help you decide which option fits your needs.

Always consult a licensed healthcare provider before starting any prescription medication. This article is for informational purposes only.