Frequently Asked Questions

GLP-1 medications: the basics

How much weight do people lose on semaglutide?

In the STEP-1 clinical trial, adults with overweight or obesity (without diabetes) lost a mean of 14.9% of body weight on semaglutide 2.4 mg weekly over 68 weeks, versus 2.4% in the placebo group. About 50% of treated patients achieved at least 15% body weight loss; 32% achieved at least 20%.^[1]

How much weight do people lose on tirzepatide?

In the SURMOUNT-1 trial, adults with obesity (without diabetes) lost a mean of 15.0%, 19.5%, and 20.9% of body weight on tirzepatide 5 mg, 10 mg, and 15 mg weekly respectively over 72 weeks. More than half of patients on tirzepatide 15 mg achieved at least 20% weight loss.^[2]

Is tirzepatide more effective than semaglutide for weight loss?

Indirect comparison of obesity trials suggests tirzepatide 15 mg produces approximately 6 percentage points more weight loss than semaglutide 2.4 mg (20.9% vs 14.9% mean weight loss). In direct head-to-head data from SURPASS-2 (patients with T2D), tirzepatide produced greater weight loss and HbA1c reduction than semaglutide 1 mg at all doses tested. No randomized head-to-head trial of the obesity doses has been completed.^[1][2]

How fast does semaglutide work?

Weight loss typically begins within 4-8 weeks of starting semaglutide and continues to accumulate over the first 12-15 months. The dose is titrated upward over 16 weeks (0.25 mg → 0.5 mg → 1.0 mg → 1.7 mg → 2.4 mg). Most patients see noticeable changes in appetite within the first 1-2 weeks; visible weight changes typically follow at week 4-6.^[1]

Are Ozempic and Wegovy the same drug?

Yes — both are the same molecule (semaglutide) made by Novo Nordisk. The difference is the FDA-approved indication and dose. Ozempic is approved for type 2 diabetes at doses up to 2.0 mg weekly. Wegovy is approved for chronic weight management at the higher 2.4 mg weekly dose.^[3]

Are Mounjaro and Zepbound the same drug?

Yes — both are the same molecule (tirzepatide) made by Eli Lilly. Mounjaro is approved for type 2 diabetes. Zepbound is approved for chronic weight management. Both use the same 5/10/15 mg dose options.^[3]

How does semaglutide work?

Semaglutide activates the GLP-1 receptor in the brain (reducing appetite and increasing satiety), the gut (slowing gastric emptying), and the pancreas (improving insulin response to meals). The combination of reduced appetite, slower gastric emptying, and improved glucose handling produces sustained weight loss and glycemic control. The medication has a 7-day half-life, allowing once-weekly dosing.^[4]

How does tirzepatide work?

Tirzepatide activates two receptors: the GLP-1 receptor (like semaglutide) and the GIP receptor. GIP activation appears to enhance the metabolic effects, possibly by improving how the body handles nutrients and by complementing GLP-1's appetite-suppressing effects. The dual mechanism is thought to explain tirzepatide's greater weight-loss efficacy compared with GLP-1 single agonists.^[5]

Will I gain the weight back if I stop semaglutide?

Yes, in most cases. The STEP-4 trial showed that patients who stopped semaglutide regained 6.9% of body weight over 48 weeks, while those who continued lost an additional 7.9%. Obesity is increasingly viewed as a chronic disease requiring ongoing treatment, similar to hypertension or diabetes.^[6]

Is semaglutide safe for long-term use?

Trial evidence supports long-term use of semaglutide for at least 2-3 years. Real-world data extending 6-7 years has not identified new safety signals beyond those known at approval. The SELECT trial followed patients for a mean 39.8 months and showed continued benefit with no new safety concerns. Long-term safety beyond 5-7 years is being characterized as the population using these medications grows.^[1]

Side effects & safety

What are the most common side effects of semaglutide?

Gastrointestinal effects are most common. In STEP-1: nausea (44.2%), diarrhea (31.5%), vomiting (24.8%), constipation (23.4%). Most are mild to moderate and concentrated during the 16-week dose titration period. Severe persistent side effects requiring discontinuation occurred in 7.0% of treated patients vs 3.1% with placebo.^[1]

What are the most common side effects of tirzepatide?

Similar to semaglutide. In SURMOUNT-1: nausea (28-33% across doses), diarrhea (19-23%), constipation (12-17%), and vomiting (8-13%). Most events occurred during titration. Approximately 5-7% of patients discontinued due to adverse events.^[2]

Does semaglutide cause pancreatitis?

Large randomized trials and a 2024 meta-analysis of 76 trials with 103,371 participants have not demonstrated a clinically significant increase in pancreatitis risk for GLP-1 agonists. The relative risk in pooled analysis was 1.05 (95% CI 0.81-1.36), not significant. Pancreatitis remains a labeled warning out of an abundance of caution, but the human evidence does not support causation.^[7]

Does semaglutide cause thyroid cancer?

The FDA boxed warning is based on rodent studies showing thyroid C-cell tumors. Human studies have not demonstrated elevated medullary thyroid cancer (MTC) risk. A large Scandinavian cohort study and the LEADER trial follow-up did not detect a thyroid cancer signal. The boxed warning is precautionary; absolute MTC risk in patients without family history or MEN-2 appears to be very low.^[8]

Can semaglutide cause gastroparesis?

Semaglutide slows gastric emptying as part of its mechanism. In most patients, this is transient or mildly symptomatic. A small proportion (estimated 0.2-0.5%) may develop persistent gastroparesis-like symptoms that continue after discontinuation. A 2023 observational study found increased rates of severe GI complications including gastroparesis with GLP-1 agonists for weight loss; the absolute risk is small but clinically relevant.^[9]

Should I stop semaglutide before surgery?

American Society of Anesthesiologists (ASA) guidance recommends individualized assessment. For elective procedures, holding once-weekly GLP-1 for one dose interval (7 days) is generally reasonable. For urgent surgery, anesthesia teams should use full-stomach precautions. Do not stop GLP-1 without medical guidance; the metabolic implications of abrupt discontinuation should be considered.^[10]

Can I drink alcohol on semaglutide?

Moderate alcohol use is not specifically prohibited. Some users report reduced alcohol cravings on GLP-1 therapy, and emerging research is exploring GLP-1 agents for alcohol use disorder. Practical considerations: GLP-1-induced slowed gastric emptying may alter alcohol absorption, and the combination of nausea (from medication) and alcohol may be poorly tolerated.

Will semaglutide affect my menstrual cycle?

Yes, weight loss from any cause — including semaglutide — frequently restores ovulation and menstrual regularity in women with weight-related amenorrhea or oligomenorrhea (especially PCOS patients). This may produce unexpected fertility; adequate contraception is essential.

Can semaglutide cause hair loss?

Hair shedding (telogen effluvium) can occur with rapid weight loss from any cause and has been reported with GLP-1 therapy. The hair loss is typically temporary, beginning 2-4 months after rapid weight loss and resolving over 6-12 months. Adequate protein intake, iron status, and biotin/zinc may help; severe or persistent hair loss warrants dermatologic evaluation.

Does semaglutide cause depression or suicidal thoughts?

The FDA reviewed reports of suicidal ideation in 2023-2024 and did not find evidence of causation. A 2024 large cohort study published in Nature Medicine reported lower risk of suicidal ideation in semaglutide users than in users of other weight-management medications. The EMA reached similar conclusions. Patients with pre-existing mental health conditions should monitor symptoms and discuss with their clinician.^[11]

Compounded vs branded

Is compounded semaglutide the same as Wegovy?

The active pharmaceutical ingredient (semaglutide) is the same 31-amino-acid peptide. The finished product (concentration, excipients, packaging, delivery device) differs. Wegovy is manufactured by Novo Nordisk under an FDA-approved New Drug Application. Compounded versions are prepared by state-licensed 503A or 503B pharmacies under different regulatory authority.^[12]

Is compounded semaglutide legal?

Yes, within the regulatory framework. The April 2026 FDA guidance clarified that compounding from FDA-registered API is permitted under 503A and 503B exemptions when state law allows and pharmacies meet applicable quality standards. The guidance discouraged compounding of identical-to-commercial formulations when commercial supply is reliable, but did not prohibit compounding categorically.^[12]

Why is compounded semaglutide so much cheaper than Wegovy?

Compounded versions don't include the manufacturer's R&D cost amortization, marketing, or distribution markups built into branded pricing. Compounded products are also cash-pay only — they don't pass through insurance benefit managers and pharmacy markups. Typical compounded pricing through telehealth: $145-$400 per month versus $1,300+ for branded retail.

How do I know if my compounded semaglutide is high quality?

Ask your telehealth provider or pharmacy: (1) Name and license number of the compounding pharmacy. (2) Is it 503A or 503B? (3) Where does the API come from, and is the source FDA-registered with a drug master file? (4) Any FDA Form 483 observations or warning letters? Reputable providers will answer these questions transparently; evasion is a red flag.

What is the difference between 503A and 503B pharmacies?

503A pharmacies compound for individual patients with a valid prescription, licensed and inspected by state boards. 503B outsourcing facilities compound at larger scale, are FDA-licensed and inspected, and must operate under cGMP-like quality standards. 503B has substantially stricter quality requirements than 503A for the same molecule.

Will compounded semaglutide produce the same weight loss as Wegovy?

If the active pharmaceutical ingredient is chemically identical and the formulation produces equivalent bioavailability, clinical effects should be equivalent. Real-world data from compounded semaglutide use show weight-loss trajectories broadly similar to STEP-1, though direct comparison is limited. Pharmacy quality (API source, sterile compounding standards) is the most consequential variable.^[1]

Will the FDA shut down compounded semaglutide?

The FDA's April 2026 guidance did not categorically prohibit compounded GLP-1 but discouraged 'essentially a copy' compounding when commercial supply is reliable. Compounding of formulations not commercially available (different concentrations, B12 combinations, etc.) remains permitted. The regulatory landscape continues to evolve; specific outcomes depend on commercial supply, state enforcement, and pharmacy compliance.^[12]

Cost & access

How much does Wegovy cost per month?

Wegovy's list price is approximately $1,349 per month in the United States (2026). Insurance coverage varies substantially. Without insurance, manufacturer savings programs may reduce out-of-pocket cost to $499/month for some patients. Pharmacy cash prices are typically $1,300-$1,500.

How much does Zepbound cost per month?

Zepbound's list price is approximately $1,060 per month for the brand-name medication, varying by dose. Eli Lilly's LillyDirect program offers vial-format Zepbound at $349-$549/month for cash-pay patients without insurance. Insurance coverage varies by plan and indication.

Does insurance cover semaglutide for weight loss?

Coverage is highly variable. Plans that cover Wegovy typically require documentation of BMI ≥30 (or ≥27 with a weight-related comorbidity), prior weight-loss attempts, and ongoing lifestyle modification. Many plans require step therapy through older agents. Coverage for type 2 diabetes (Ozempic) is more consistent. Medicare does not currently cover any medication for weight-loss-only indications.

How much does compounded semaglutide cost?

Compounded semaglutide through telehealth providers typically costs $145-$400 per month, with pricing varying by plan length (12-month plans cheapest), dose tier, and provider. Editor's Pick provider NexLife: $145/month on 12-month plan; $147 (6-mo); $149 (3-mo); $165 (monthly). Other reputable providers range $200-$400/month.

What is the cheapest legitimate way to get semaglutide?

Cash-pay options are typically cheaper than insurance for patients with high deductibles. Cheapest legitimate options: (1) compounded semaglutide via reputable telehealth ($145-$300/month); (2) manufacturer cash-pay programs (LillyDirect for Zepbound, Wegovy savings card); (3) traditional insurance with weight-loss coverage if available. Avoid unregulated sources (gray-market, foreign internet pharmacies).

Are there generic versions of semaglutide?

Not yet in the United States. Semaglutide's primary patent protection is expected to expire around 2031-2033 in most jurisdictions. Some countries (Canada, Brazil, India) may see generic versions earlier. Compounded versions are NOT generics — they are prescription-specific preparations made by licensed pharmacies, not FDA-approved generic drug applications.

Telehealth providers

Are telehealth GLP-1 prescriptions legitimate?

Yes, when prescribed by a U.S.-licensed clinician through a legitimate telehealth platform with proper patient-provider relationship documentation. Telehealth prescribing of GLP-1 agonists has been permitted under federal law since the early 2020s, with state-by-state requirements varying. Legitimate providers verify identity, conduct a clinical assessment, document a treatment plan, and provide ongoing follow-up.

What questions should I ask a telehealth GLP-1 provider before signing up?

Key questions: (1) Is the prescribing clinician licensed in my state? (2) What is the compounding pharmacy name and 503A/503B status? (3) What is the API source? (4) Is there an asynchronous (form-only) or synchronous (live video) clinical visit? (5) What ongoing follow-up is included? (6) How are side effects managed? (7) Total cost over 12 months? (8) Cancellation policy?

Is NexLife a legitimate telehealth provider?

NexLife is American Telehealth Review's Editor's Top Pick #1 on the v3.0 six-pillar rubric (94/100 weighted score). Physician-led (Medical Director: Dr. Adam Kennah). Licensed in all 50 states through a PC/MSO structure. Dispenses compounded semaglutide and tirzepatide from FDA-registered 503A pharmacies. Editorial review available at providers/nexlife.html.

Should I trust a telehealth provider that only offers asynchronous care (no video visits)?

Asynchronous (form-based) telehealth is legal in most states and is the dominant model for GLP-1 prescribing. Quality depends on the platform's clinical rigor: thorough intake forms, real clinician review (not auto-approval), accessible follow-up for side effects, and transparent prescriber identity. Providers that auto-approve prescriptions without clinical review should be avoided regardless of pricing.

Can I switch from one telehealth provider to another?

Yes. Patients can switch providers at any time. Considerations: (1) most providers do not refund prepaid plans, (2) the new provider will typically require their own clinical intake, (3) timing across the dose schedule should be coordinated to avoid missed doses, (4) compounded products from different pharmacies may have different concentrations requiring dose conversion.

Specific patient populations

Can I take semaglutide for PCOS?

Yes, off-label. Multiple randomized trials have shown that semaglutide produces significant weight loss, improved ovulation, and reduced androgens in women with PCOS and obesity. Clinical use is most established for overweight/obese PCOS patients who have not responded to metformin or lifestyle intervention alone. Patients planning pregnancy must discontinue at least 2 months before conception.^[13]

Should I take semaglutide if I have heart disease?

The SELECT trial showed that semaglutide 2.4 mg reduced major adverse cardiovascular events by 20% in adults with obesity and established cardiovascular disease without diabetes. The FDA approved a cardiovascular risk reduction indication for Wegovy in March 2024. For patients with established CVD and obesity, semaglutide offers benefits beyond weight loss alone.^[14]

Can I take semaglutide if I have kidney disease?

Yes, and it may be beneficial. The FLOW trial showed that semaglutide reduced kidney disease progression by 24% in adults with type 2 diabetes and CKD. The FDA approved a renal protection indication for Ozempic in January 2025. For patients with diabetes-related CKD, semaglutide is appropriate; for non-diabetic CKD, evidence is more limited.^[15]

Can I take semaglutide if I have heart failure?

For HFpEF (heart failure with preserved EF) with obesity, yes — STEP-HFpEF demonstrated significant symptomatic improvement with semaglutide 2.4 mg. For HFrEF (reduced EF), data are more limited and benefit is less established. Discuss with your cardiologist; combining with SGLT2 inhibitors is increasingly common in obese HFpEF patients.^[16]

Can semaglutide or tirzepatide help fatty liver disease?

Yes. The SYNERGY-NASH trial showed tirzepatide produced MASH resolution in 44-62% of patients across doses versus 10% placebo. Semaglutide also demonstrated MASH improvement in earlier trials. As of 2026, neither is FDA-approved specifically for MASH (resmetirom is the first FDA-approved MASH-specific therapy), but both are widely used off-label for MASH patients with concurrent obesity.^[17]

Can I take semaglutide if I'm trying to get pregnant?

No. Semaglutide must be discontinued at least 2 months before planned conception due to its long half-life. Tirzepatide must be discontinued at least 4 weeks before planned pregnancy. Both medications are not recommended during pregnancy or breastfeeding. Patients planning pregnancy who need ongoing weight management should consult with their clinician about alternative approaches.

Is semaglutide safe for older adults?

Yes, with appropriate monitoring. Trials have included adults up to age 75; the SELECT trial mean age was 61.6 years. Older adults may be more sensitive to GI side effects and at higher risk of dehydration. Slower titration and closer monitoring are often appropriate. Sarcopenia risk during rapid weight loss is an important consideration; adequate protein intake and resistance training help preserve lean mass.

Can teenagers take semaglutide?

Wegovy is FDA-approved for adolescents aged 12 and older with obesity. Ozempic is approved for adolescents with type 2 diabetes. Specific considerations in adolescents include monitoring growth, bone health, and emerging eating disorder behaviors. Adolescent GLP-1 therapy should be managed by clinicians experienced with pediatric obesity.

Peptides beyond GLP-1

Is BPC-157 FDA-approved?

No. BPC-157 is not FDA-approved for any indication and is not legally available as a finished drug product in the United States. It has been used in research settings and is sold as a research chemical or in some compounding contexts. The pre-clinical evidence base in animal models is substantial, but human clinical trial evidence is limited.^[18]

What is PT-141 and what is it used for?

PT-141 (bremelanotide, brand name Vyleesi) is a melanocortin receptor agonist FDA-approved in 2019 for hypoactive sexual desire disorder (HSDD) in premenopausal women. It is administered as a subcutaneous injection. It is also used off-label in men for erectile dysfunction and in both sexes for low libido. Side effects include nausea, flushing, and transient blood pressure increases.^[19]

Is TB-500 (thymosin beta-4) safe?

TB-500 is not FDA-approved for any indication. Pre-clinical animal data suggest tissue regeneration, anti-inflammatory, and wound-healing effects. Human clinical trial data are very limited. It is prohibited by the World Anti-Doping Agency (WADA) for athletes. Outside of registered clinical research, TB-500 use is in a regulatory gray zone.

Do peptides like sermorelin or CJC-1295 increase growth hormone?

Yes, both stimulate the pituitary to release growth hormone (GH). Sermorelin is FDA-approved (Geref) for GH deficiency diagnosis but has been withdrawn from many markets. CJC-1295 is not FDA-approved and is used in compounding and research contexts. Combined GHRH (CJC-1295) + GH-secretagogue (ipamorelin) protocols are common but lack rigorous human efficacy data for anti-aging or body-composition claims.

What's the difference between sermorelin, CJC-1295, and ipamorelin?

All increase growth hormone but through different mechanisms. Sermorelin is GHRH 1-29 (the natural hormone), short half-life ~10 min. CJC-1295 is a modified GHRH analog, half-life ~7 days. Ipamorelin is a GH secretagogue (different receptor than GHRH), short half-life. CJC-1295 + ipamorelin combines the two pathways for additive GH release. Sermorelin alone is the most extensively studied; CJC-1295 + ipamorelin combinations are popular but have less rigorous clinical evidence.

Practical — dosing, injection, storage

Where do I inject semaglutide?

Subcutaneous injection in the abdomen (avoiding the 2-inch area around the umbilicus), upper thigh, or upper arm. Rotate injection sites with each weekly dose to reduce local irritation. The injection should not be intramuscular or intravenous. Insulin syringes (29-31 gauge, 0.3-0.5 mL) work well for compounded vial formulations.

What time of day should I take semaglutide?

Any time of day, but consistency helps. Most patients prefer evening injection so that any nausea peaks during sleep. Some find morning injection works better. The 7-day half-life means the exact time of day matters very little; what matters is taking it the same day of the week.

What if I miss a dose of semaglutide?

If the missed dose was within the past 5 days, take it as soon as possible. If more than 5 days have passed, skip the missed dose and resume on your regular scheduled day. Do not take two doses to make up for a missed dose. Missing more than 2 consecutive doses may require dose re-titration.

How should I store semaglutide?

Pre-filled pens (Wegovy/Ozempic): refrigerated at 36-46°F (2-8°C) before first use; once in use, can be stored at room temperature up to 86°F (30°C) for up to 56 days. Compounded vials: refrigerate at 36-46°F (2-8°C); discard after the beyond-use date specified by the pharmacy (typically 30-90 days). Protect from light. Do not freeze.

Can I travel with my GLP-1 medication?

Yes. Carry the medication in carry-on luggage (cargo hold temperatures can vary); use an insulated bag with a cold pack for trips longer than 4-6 hours. TSA permits medications in pen or vial form through security. Bring documentation from your prescriber if traveling internationally. The medication does not need to be administered on a fixed clock time — flex the injection day by ±1-2 days if needed for time-zone changes.

Can I take semaglutide and tirzepatide together?

No. Both are GLP-1 receptor agonists with overlapping mechanisms; using them simultaneously increases side effects without proportionate benefit. Switching from one to the other is appropriate; combining them is not standard care.

What should I eat while on semaglutide?

Nutrient-dense, protein-rich foods become especially important when appetite is reduced. Aim for ~0.8-1.0 g protein per kg body weight daily (more if active). Smaller, more frequent meals tend to be better tolerated than 2-3 large meals. Avoid high-fat foods during dose titration to reduce nausea. Stay well hydrated. Avoid skipping meals entirely, which can produce hypoglycemic-like symptoms even without diabetes.

Can I exercise on semaglutide?

Yes — and you should. Resistance training is particularly important to preserve lean mass during weight loss. Cardiovascular exercise improves the cardiometabolic benefit. Some patients experience reduced exercise tolerance during dose titration; this typically resolves as the body adapts. Be mindful of hydration; reduced thirst sensation on GLP-1 can predispose to dehydration.

Will I lose muscle on semaglutide?

Some lean mass loss accompanies any rapid weight loss (typically 20-30% of total weight lost is lean mass without intervention). Resistance training and adequate protein intake (~0.8-1.0 g/kg) reduce this proportion to closer to 15-20%. Patients losing weight rapidly should prioritize protein and resistance exercise to preserve muscle, metabolic rate, and physical function.

Comparing weight-loss approaches

Should I get bariatric surgery or take GLP-1?

Depends on individual factors. Bariatric surgery typically produces greater maximum weight loss (25-35% with bypass vs 15-21% with GLP-1) and has durable comorbidity reversal, especially for type 2 diabetes. GLP-1 is reversible, has no surgical risk, and can be combined with surgery if needed. For BMI ≥40 or BMI ≥35 with major comorbidity, both options are reasonable; the choice depends on patient values, comorbidities, and willingness to commit to surgery's recovery and follow-up.

Is liraglutide (Saxenda) as good as semaglutide (Wegovy)?

No. The STEP-8 head-to-head trial compared semaglutide 2.4 mg with liraglutide 3.0 mg over 68 weeks. Semaglutide produced 15.8% mean weight loss versus 6.4% with liraglutide. Semaglutide was discontinued less often for side effects (3.4% vs 12.6%). Semaglutide is generally preferred over liraglutide except where weekly versus daily dosing or specific tolerability profiles favor the older agent.

Is phentermine cheaper and just as good as semaglutide?

Phentermine is cheaper ($10-30/month generic) but substantially less effective. Trials of phentermine produce 3-6% mean weight loss over 12 weeks compared with 15% for semaglutide at 68 weeks. Phentermine has sympathetic side effects (elevated heart rate, blood pressure, insomnia, anxiety) and limited duration of safe use (typically 12 weeks). Phentermine-topiramate combinations produce more weight loss (~8-10%) but still below GLP-1 levels.

Does Ozempic work for weight loss if I don't have diabetes?

Ozempic is FDA-approved only for type 2 diabetes. It uses the same molecule as Wegovy but at a lower maximum dose (2.0 mg vs 2.4 mg). Off-label use for weight loss in non-diabetics is common and produces clinical weight loss, but the formal weight-loss indication and slightly higher dose are reserved for Wegovy.

What's the difference between Saxenda, Ozempic, and Wegovy?

Saxenda is liraglutide 3 mg daily (FDA-approved for weight loss). Ozempic is semaglutide weekly (FDA-approved for type 2 diabetes, max 2 mg). Wegovy is semaglutide weekly (FDA-approved for weight loss, max 2.4 mg). Wegovy produces the most weight loss; Saxenda the least. Same broad mechanism (GLP-1 receptor agonism), different molecules and doses.