Which GLP-1 is FDA Approved for Weight Loss?

Last reviewed: June 9, 2026

Last updated: June 9, 2026

Written by: Jay Hastings, CEO of PlexusDx

Jay Hastings is the CEO of PlexusDx, a precision health company focused on genetic testing, blood biomarker insights, and personalized wellness recommendations. He has more than 20 years of experience across healthcare innovation, genomics, laboratory operations, healthcare investing, and strategic finance.

Medically reviewed by: Jayden Lee, PharmD, EMBA

Jayden Lee, PharmD, EMBA, is the PlexusDx Medical Science Liaison with a PharmD and MBA specializing in pharmacogenomics and clinical product development, with a proven ability to bridge the gap between genomic research and practical patient outcomes. Dr. Lee has more than 10 years of professional experience in clinical pharmacy, academia, and research.

This article is part of the PlexusDx Education Hub — science-backed guidance on GLP-1 medications, metabolic health, and precision weight management.

Three GLP-1 receptor agonist medications currently hold FDA approval for weight loss in adults with obesity or overweight conditions: semaglutide, tirzepatide, and liraglutide. PlexusDx provides access to compounded versions of these medications through licensed 503A pharmacies, making precision weight loss therapy available in all 50 states without insurance requirements.

FDA-Approved GLP-1 Medications for Weight Loss

The Food and Drug Administration has cleared semaglutide (brand name Wegovy), tirzepatide (brand name Zepbound), and liraglutide (brand name Saxenda) as prescription medications specifically for chronic weight management. Semaglutide injection received FDA approval in 2021 as a once-weekly treatment for patients with a BMI of 30 or higher or those with a BMI of 27 or higher plus weight-related health conditions. Tirzepatide followed in 2023 and represents a dual-action GLP-1/GIP receptor agonist showing stronger weight reduction in clinical trials.

Liraglutide, approved in 2014, was the first GLP-1 drug indicated for weight loss and requires daily injections. Each medication works by mimicking glucagon-like peptide-1, a natural hormone that regulates appetite and blood sugar. The FDA approval process required manufacturers to demonstrate safety and efficacy through large-scale randomized controlled trials involving thousands of participants over multiple years.

How FDA-Approved GLP-1s Work for Weight Management

GLP-1 receptor agonists activate specific receptors in the brain's appetite control centers, producing sustained feelings of fullness and reducing hunger signals. Clinical data shows these medications slow gastric emptying, meaning food moves through the stomach more gradually, which extends satiety between meals. Patients typically report reduced cravings, decreased interest in food, and improved ability to stick to calorie-controlled eating patterns without the constant hunger that derails most diets.

Beyond appetite suppression, approved GLP-1 medications improve insulin secretion in response to meals and enhance pancreatic beta cell function. The STEP trials (for semaglutide) and SUMO trials (for tirzepatide) demonstrated average weight loss ranging from 15% to 22% of baseline body weight over 68 weeks—results substantially greater than diet and exercise alone or older weight loss medications.

Compounded vs. Brand-Name GLP-1 Options

PlexusDx offers compounded semaglutide and tirzepatide manufactured through licensed 503A compounding pharmacies, which are federally regulated facilities that compound medications from FDA-approved bulk chemicals. These compounded versions contain the same active pharmaceutical ingredients as brand-name Wegovy and Zepbound but at significantly lower costs—PlexusDx compounded semaglutide injection starts at $149 per month, compared to hundreds of dollars monthly for branded alternatives.

While compounded medications are not FDA-approved drugs themselves, the active ingredients derive from FDA-approved sources and are prepared under strict quality standards. PlexusDx does not require insurance, membership fees, or prior authorization, making compounded GLP-1 therapy accessible to patients regardless of insurance status. Medications are HSA and FSA eligible, and treatment is available in all 50 states with direct shipment to patients' homes.

Personalized GLP-1 Selection Through Genetic Testing

Individual responses to GLP-1 medications vary based on genetic differences in appetite-regulating pathways. PlexusDx offers the Precision Peptide Genetic Test, which analyzes how variants in genes like GLP1R, GIPR, FTO, and MC4R influence a patient's weight loss potential and medication responsiveness. Testing costs $99 as an add-on after the first month of treatment and maps 14 metabolic pathways across 49 peptides to generate personalized insights.

The genetic test helps identify whether patients may respond better to semaglutide, tirzepatide, or PlexusDx's GLP-Squared dual-compound option combining both agents. This precision approach reduces trial-and-error adjustments and helps patients select the most effective medication for their unique biology, optimizing both weight loss outcomes and cost efficiency.

How Your Genetics Influence GLP-1 Response

Not everyone responds to GLP-1 medications the same way. Genetic variants — including GIPR rs1800437, GLP1R rs6923761, FTO rs9939609, and MC4R rs17782313 — influence how your body processes these medications, how much weight you lose, and how you tolerate side effects. PlexusDx maps 14 pathways, 49 peptides, and 150+ genetic insights to match each patient to the right medication, dose, and lifestyle protocol for their biology. The PlexusDx Precision Peptide Genetic Test ($99 add-on after your first month of treatment) gives your provider precise insight into your peptide genetic predispositions before the first prescription is written.

Access Personalized GLP-1 Care Through PlexusDx

PlexusDx offers six prescription GLP-1 protocols to all 50 states — no membership, no insurance required, async intake or live consult. The Semaglutide Injection starts at $149/mo. Medications are dispensed from licensed 503A compounding pharmacies following strict quality and safety standards. Add a Precision Peptide Genetic Test for $99 to personalize your protocol from day one.

Frequently Asked Questions

Is compounded semaglutide the same as FDA-approved Wegovy?

Compounded semaglutide contains the identical active ingredient as Wegovy but is manufactured by licensed 503A compounding pharmacies rather than the brand-name manufacturer. Both work identically in the body, though the FDA has approved Wegovy as a finished drug product while compounded versions use FDA-approved bulk chemicals. PlexusDx compounded semaglutide starts at $149/month, making it substantially more affordable than brand-name alternatives.

Which GLP-1 showed the best weight loss results in clinical trials?

Tirzepatide demonstrated the strongest average weight loss in FDA trials, with patients losing up to 22% of baseline body weight in the SUMO-1 trial over 68 weeks. Semaglutide showed approximately 15% average weight loss in the STEP trials. Tirzepatide's dual GLP-1/GIP mechanism provides slightly greater appetite suppression, though both medications are highly effective for chronic weight management.

Can I access these medications through PlexusDx without insurance?

Yes, PlexusDx serves all 50 states with no insurance requirement, membership fees, or prior authorization. Compounded semaglutide injection starts at $149 per month and tirzepatide injection at $249 per month, with costs remaining flat regardless of dose escalation. Treatment is HSA and FSA eligible for added savings.

What are the common side effects of FDA-approved GLP-1 medications?

The most frequent side effects are gastrointestinal and include nausea, vomiting, diarrhea, and constipation, typically most pronounced during initial weeks and dose increases. These effects often decrease as the body adjusts. Rare but serious risks include pancreatitis, thyroid concerns, and gallbladder complications—all require medical supervision. PlexusDx patients receive ongoing provider support to monitor safety and manage side effects.

How does the Precision Peptide Genetic Test help me choose between semaglutide and tirzepatide?

The Precision Peptide Genetic Test identifies variants in GLP1R, GIPR, FTO, and MC4R genes that predict individual response to GLP-1 therapy and dual-action agents. Patients with specific genetic profiles may experience superior weight loss with tirzepatide's dual mechanism, while others respond optimally to semaglutide alone. Testing also guides whether PlexusDx's GLP-Squared combination therapy might maximize results for your genetics.

Related Reading

• Glp 1 For Weight Loss 2
• Glp 1 Weight Loss Before And After
• Glp 1 Dosage For Weight Loss
• Glp 1 Receptor Agonist For Weight Loss

Pricing and availability current as of June 2026. Compounded GLP-1 medications are not FDA-approved drug products; they are prepared by licensed compounding pharmacies under federal compounding regulations. Compounded semaglutide and tirzepatide are not the same as Wegovy, Ozempic, Zepbound, or Mounjaro. This article is for informational purposes only and does not constitute medical advice. Consult a licensed healthcare provider before starting, stopping, or changing any medication.

Return to the PlexusDx Education Hub for more evidence-based resources on GLP-1 therapy, metabolic health, and personalized weight management.

Medical and Editorial Standards

Medical review process: This article was reviewed for medical accuracy, scientific clarity, evidence alignment, and appropriate discussion of genetics, medications, supplements, biomarkers, and health-related claims.

Sources and evidence: PlexusDx educational content is developed using peer-reviewed research, clinical literature, reputable medical references, and, where applicable, public health or regulatory guidance.

Commercial transparency: PlexusDx offers genetic testing, blood biomarker testing, personalized supplement recommendations, and related precision wellness services. Product mentions are intended to help readers understand available options and should not be interpreted as medical advice.

Important disclaimer: PlexusDx educational content is for informational purposes only and should not be used as a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making decisions about medications, supplements, genetic testing, lab testing, or health-related care.