What is the difference between Ozempic, Wegovy, and Mounjaro?

Ozempic and Wegovy are both semaglutide, just at different doses and with different FDA approvals. Ozempic is approved for type 2 diabetes, Wegovy for weight management. Mounjaro (and its weight-loss-branded version Zepbound) is tirzepatide, a dual GLP-1 and GIP medication that tends to produce more weight loss on average.

How fast do GLP-1 medications start working?

Most patients notice the food noise quiet down within 1 to 2 weeks of the first injection. Real changes on the scale typically show up by week 4 to 8. We start at the lowest dose and step up every four weeks to limit side effects.

What are the most common side effects?

The most common side effects are nausea, constipation, reflux, and fatigue, especially during dose increases. These usually settle within a week or two. Severe side effects (pancreatitis, gallbladder problems, or severe vomiting) are rare but real, and we screen carefully.

Will I gain the weight back when I stop?

Yes, most patients regain a meaningful share of the weight if they stop suddenly without a maintenance plan. We treat GLP-1s like glasses, not antibiotics. Some patients stay on a low maintenance dose long term. Others taper off carefully while keeping the protein, sleep, and training habits we built.

Are GLP-1 medications safe long term?

GLP-1 medications have over 15 years of safety data in diabetes care, with newer indications added over time. The most likely long-term concerns are muscle loss and gallbladder issues. Both can be managed with the right protein, training, and monitoring. We do not yet have 30-year human data.

Can I drink alcohol on a GLP-1?

You can drink alcohol on a GLP-1, but most patients find they want it less and tolerate less. The dampened dopamine spike that quiets food noise also quiets the alcohol kick. If you choose to drink, expect a faster sense of "I am done."

Do GLP-1 medications affect mood or mental health?

The mood data is mixed. Most patients feel more even and clearheaded as glucose stabilizes. A subset reports low mood, low motivation, or anhedonia, especially at higher doses. We screen with a brief questionnaire (PHQ-9) before starting and at regular check-ins.

Can GLP-1 medications help with PCOS?

Yes, GLP-1 medications can help women with polycystic ovary syndrome (PCOS), a hormonal condition that often involves insulin resistance and irregular cycles. By improving insulin sensitivity and supporting weight loss, GLP-1s often restore more regular periods and reduce androgen-driven symptoms. We coordinate with your gynecologist when needed.

What lab work do you check before starting a GLP-1?

Before starting a GLP-1, I check a comprehensive metabolic panel, lipid panel with ApoB, fasting insulin, hemoglobin A1c, thyroid panel, lipase, vitamin D, B12, ferritin, and a baseline DEXA scan when available. We want to know your starting point for muscle, fat, and metabolic health, not just your weight.

Are there contraindications for GLP-1 medications?

Yes. The main contraindications are a personal or strong family history of medullary thyroid cancer or multiple endocrine neoplasia type 2 (MEN2), a history of pancreatitis, gastroparesis (severely slow stomach emptying), or active eating disorders. We also pause GLP-1s before any planned surgery with anesthesia.

How do GLP-1s interact with other medications?

GLP-1s slow gastric emptying, which can change how oral medications absorb. Birth control pills may need a backup method during dose changes. Insulin and sulfonylureas often need lower doses to avoid low blood sugar. We review every prescription on the list before starting.

Can I use a GLP-1 if I have type 1 diabetes?

GLP-1 medications are not first-line for type 1 diabetes, but they are sometimes used off-label alongside insulin in adults with insulin resistance and type 1. The risk of low blood sugar and ketoacidosis goes up. Any plan must be coordinated with an endocrinologist.

What about pregnancy or trying to conceive?

GLP-1 medications are not recommended in pregnancy. We stop the medication at least two months before trying to conceive to allow it to clear. If you become pregnant on a GLP-1, contact us right away. Weight gain in pregnancy is a feature, not a bug.

How do GLP-1s affect bone density and muscle mass?

Rapid weight loss of any kind, including from a GLP-1, can pull bone and muscle along with fat. We protect bone with vitamin D, calcium-rich foods, and resistance training. We protect muscle with adequate protein and lifting. Without those guardrails, the long-term cost can outweigh the short-term wins.

Can teenagers use GLP-1 medications?

The FDA has approved certain GLP-1s for adolescents with obesity starting at age 12. The data shows meaningful weight reduction and metabolic improvement, but long-term safety in growing bodies is still being studied. We coordinate any adolescent use closely with the patient's pediatrician.

What if I have a history of gallstones or gallbladder issues?

GLP-1s slightly raise the risk of gallstones and gallbladder inflammation, especially during rapid weight loss. If you have a history of gallstones, we monitor symptoms closely and slow the dose escalation. Severe right upper abdominal pain after meals is a sign to call us right away.

Are compounded GLP-1s safe?

Compounded GLP-1s have filled a real gap during shortages, but quality varies a lot between pharmacies. The FDA does not test compounded products the way it does brand-name drugs. We use them only when no FDA-approved option is accessible and we vet the pharmacy carefully.

How do GLP-1 medications fit with menopause?

GLP-1 medications often pair well with hormone therapy in midlife. Both target some of the metabolic shifts that show up around menopause. We monitor body composition with DEXA, lipids with ApoB, and bone density. Many of our patients use bioidentical hormone therapy and a low-dose GLP-1 together.

What is the cost in Philadelphia and what does insurance cover?

In Philly, brand-name semaglutide and tirzepatide cash prices run $900 to $1,400 per month. Insurance coverage varies widely. Diabetes diagnoses are usually covered. Weight-only diagnoses are inconsistent. Some patients use compounded options at $200 to $400 per month while supply and cost stabilize.

How long should I plan to stay on a GLP-1?

Plan in seasons, not sprints. Most patients use a GLP-1 for 12 to 24 months at a steady dose, then either taper to a maintenance dose or come off with a structured habit plan. We retest body composition and metabolic markers along the way to guide the decision.

What does "Ozempic face" actually look like and how do you prevent it?

"Ozempic face" describes the hollow, deflated look that can follow rapid weight loss anywhere on the body, especially the face and hands. Slow titration, adequate protein, strength training, and steady hydration prevent most of it. If volume loss happens, it usually settles over six to twelve months.

How do GLP-1 medications affect biological age and longevity markers?

Early data suggest GLP-1 medications improve several longevity markers (CRP, ApoB, fasting insulin, blood pressure) and may slow methylation-based biological age in patients with obesity or diabetes. We treat that as encouraging, not definitive. The next decade of data will tell us more.

Can I work with Fishtown Medicine on a GLP-1 if I live outside Philly?

Yes, our practice is licensed across many states, and we can manage GLP-1 plans through secure video visits and home lab draws. Philly patients also see us in person. Either way, the structure is the same: low effective dose, protein, training, and regular labs.

What is the difference between Ozempic, Wegovy, and Mounjaro?

Ozempic and Wegovy are both semaglutide, just at different doses and with different FDA approvals. Ozempic is approved for type 2 diabetes, Wegovy for weight management. Mounjaro (and its weight-loss-branded version Zepbound) is tirzepatide, a dual GLP-1 and GIP medication that tends to produce more weight loss on average.

How fast do GLP-1 medications start working?

Most patients notice the food noise quiet down within 1 to 2 weeks of the first injection. Real changes on the scale typically show up by week 4 to 8. We start at the lowest dose and step up every four weeks to limit side effects.

What are the most common side effects?

The most common side effects are nausea, constipation, reflux, and fatigue, especially during dose increases. These usually settle within a week or two. Severe side effects (pancreatitis, gallbladder problems, or severe vomiting) are rare but real, and we screen carefully.

Will I gain the weight back when I stop?

Yes, most patients regain a meaningful share of the weight if they stop suddenly without a maintenance plan. We treat GLP-1s like glasses, not antibiotics. Some patients stay on a low maintenance dose long term. Others taper off carefully while keeping the protein, sleep, and training habits we built.

Are GLP-1 medications safe long term?

GLP-1 medications have over 15 years of safety data in diabetes care, with newer indications added over time. The most likely long-term concerns are muscle loss and gallbladder issues. Both can be managed with the right protein, training, and monitoring. We do not yet have 30-year human data.

Can I drink alcohol on a GLP-1?

You can drink alcohol on a GLP-1, but most patients find they want it less and tolerate less. The dampened dopamine spike that quiets food noise also quiets the alcohol kick. If you choose to drink, expect a faster sense of "I am done."

Do GLP-1 medications affect mood or mental health?

The mood data is mixed. Most patients feel more even and clearheaded as glucose stabilizes. A subset reports low mood, low motivation, or anhedonia, especially at higher doses. We screen with a brief questionnaire (PHQ-9) before starting and at regular check-ins.

Can GLP-1 medications help with PCOS?

Yes, GLP-1 medications can help women with polycystic ovary syndrome (PCOS), a hormonal condition that often involves insulin resistance and irregular cycles. By improving insulin sensitivity and supporting weight loss, GLP-1s often restore more regular periods and reduce androgen-driven symptoms. We coordinate with your gynecologist when needed.

What lab work do you check before starting a GLP-1?

Before starting a GLP-1, I check a comprehensive metabolic panel, lipid panel with ApoB, fasting insulin, hemoglobin A1c, thyroid panel, lipase, vitamin D, B12, ferritin, and a baseline DEXA scan when available. We want to know your starting point for muscle, fat, and metabolic health, not just your weight.

Are there contraindications for GLP-1 medications?

Yes. The main contraindications are a personal or strong family history of medullary thyroid cancer or multiple endocrine neoplasia type 2 (MEN2), a history of pancreatitis, gastroparesis (severely slow stomach emptying), or active eating disorders. We also pause GLP-1s before any planned surgery with anesthesia.

How do GLP-1s interact with other medications?

GLP-1s slow gastric emptying, which can change how oral medications absorb. Birth control pills may need a backup method during dose changes. Insulin and sulfonylureas often need lower doses to avoid low blood sugar. We review every prescription on the list before starting.

Can I use a GLP-1 if I have type 1 diabetes?

GLP-1 medications are not first-line for type 1 diabetes, but they are sometimes used off-label alongside insulin in adults with insulin resistance and type 1. The risk of low blood sugar and ketoacidosis goes up. Any plan must be coordinated with an endocrinologist.

What about pregnancy or trying to conceive?

GLP-1 medications are not recommended in pregnancy. We stop the medication at least two months before trying to conceive to allow it to clear. If you become pregnant on a GLP-1, contact us right away. Weight gain in pregnancy is a feature, not a bug.

How do GLP-1s affect bone density and muscle mass?

Rapid weight loss of any kind, including from a GLP-1, can pull bone and muscle along with fat. We protect bone with vitamin D, calcium-rich foods, and resistance training. We protect muscle with adequate protein and lifting. Without those guardrails, the long-term cost can outweigh the short-term wins.

Can teenagers use GLP-1 medications?

The FDA has approved certain GLP-1s for adolescents with obesity starting at age 12. The data shows meaningful weight reduction and metabolic improvement, but long-term safety in growing bodies is still being studied. We coordinate any adolescent use closely with the patient's pediatrician.

What if I have a history of gallstones or gallbladder issues?

GLP-1s slightly raise the risk of gallstones and gallbladder inflammation, especially during rapid weight loss. If you have a history of gallstones, we monitor symptoms closely and slow the dose escalation. Severe right upper abdominal pain after meals is a sign to call us right away.

Are compounded GLP-1s safe?

Compounded GLP-1s have filled a real gap during shortages, but quality varies a lot between pharmacies. The FDA does not test compounded products the way it does brand-name drugs. We use them only when no FDA-approved option is accessible and we vet the pharmacy carefully.

How do GLP-1 medications fit with menopause?

GLP-1 medications often pair well with hormone therapy in midlife. Both target some of the metabolic shifts that show up around menopause. We monitor body composition with DEXA, lipids with ApoB, and bone density. Many of our patients use bioidentical hormone therapy and a low-dose GLP-1 together.

What is the cost in Philadelphia and what does insurance cover?

In Philly, brand-name semaglutide and tirzepatide cash prices run $900 to $1,400 per month. Insurance coverage varies widely. Diabetes diagnoses are usually covered. Weight-only diagnoses are inconsistent. Some patients use compounded options at $200 to $400 per month while supply and cost stabilize.

How long should I plan to stay on a GLP-1?

Plan in seasons, not sprints. Most patients use a GLP-1 for 12 to 24 months at a steady dose, then either taper to a maintenance dose or come off with a structured habit plan. We retest body composition and metabolic markers along the way to guide the decision.

What does "Ozempic face" actually look like and how do you prevent it?

"Ozempic face" describes the hollow, deflated look that can follow rapid weight loss anywhere on the body, especially the face and hands. Slow titration, adequate protein, strength training, and steady hydration prevent most of it. If volume loss happens, it usually settles over six to twelve months.

How do GLP-1 medications affect biological age and longevity markers?

Early data suggest GLP-1 medications improve several longevity markers (CRP, ApoB, fasting insulin, blood pressure) and may slow methylation-based biological age in patients with obesity or diabetes. We treat that as encouraging, not definitive. The next decade of data will tell us more.

Can I work with Fishtown Medicine on a GLP-1 if I live outside Philly?

Yes, our practice is licensed across many states, and we can manage GLP-1 plans through secure video visits and home lab draws. Philly patients also see us in person. Either way, the structure is the same: low effective dose, protein, training, and regular labs.

TL;DR · 30-second take

GLP-1 medications (like semaglutide and tirzepatide, sold as Ozempic, Wegovy, Mounjaro, and Zepbound) do more than help with weight loss. They quiet food and craving signals in the brain, lower body-wide inflammation, and have been shown to cut heart attacks and strokes in adults with heart disease, even without diabetes.

It Is Not a Diet Drug. It Is a Software Update.

TL;DR: The media calls them "weight loss jabs." We call them neuro-metabolic regulators. GLP-1 medications (semaglutide and tirzepatide) are reshaping medicine by quieting addictive food chatter in the brain, calming body-wide inflammation, and protecting the heart.

In Medicine 2.0, we waited for you to get diabetes, then gave you a drug to manage it. In Medicine 3.0, we treat obesity as what it actually is: a problem with hormonal signaling, not a personal failing. GLP-1 medications (Ozempic, Wegovy, and Mounjaro) are the first tools that effectively rewrite that signaling.

How Do GLP-1 Medications Quiet "Food Noise"?

Patients tell me the same thing within two weeks of starting a GLP-1 plan:

"Dr. Ash, the radio in my head finally turned off."

For decades, we told patients to "just eat less." For many, the brain's food noise (the constant, intrusive thought about the next meal) makes willpower physically hard. GLP-1 receptors sit in the hypothalamus (the hunger control center) and the nucleus accumbens (the brain's reward and addiction hub). When we activate those receptors:

Fullness signals get louder.
The dopamine spike from rewards (food, alcohol, scrolling) gets quieter.

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Can GLP-1s Help With Addiction Too?

This is some of the most interesting emerging science. Patients are not just eating less. Many also report:

Drinking less alcohol on their own.
Less compulsive online shopping.
Less nail biting and other repetitive habits.

By flattening the dopamine spike, GLP-1s appear to dial down the root mechanism behind compulsive behavior, whether the trigger is sugar, bourbon, or late-night Amazon scrolling. There is a flip side worth knowing about, too: some patients describe a flatter emotional baseline (lower pleasure, motivation, or libido) on the same medications, sometimes called "Ozempic personality." For the full picture of GLP-1s and the brain, including the addiction signals and what to watch for, see GLP-1s and your brain.

What Did the SELECT Trial Show About the Heart?

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The debate over "is this even healthy?" mostly ended in 2023 with the SELECT trial.

The study. Over 17,000 patients with established heart disease, but no diabetes.
The result. A 20% reduction in heart attacks, strokes, and cardiovascular death.

The benefit was not just from weight loss. The medication has its own anti-inflammatory effect on blood vessels. The FDA has now approved semaglutide as a heart medication, not only as a weight medication.

What Is the Fishtown "Micro-Dose" Strategy?

We do not believe in the "more is better" approach baked into standard dosing schedules. High doses can lead to:

"Ozempic face." Rapid fat loss can deflate the face.
Sarcopenia. Severe muscle loss that wrecks long-term metabolism.
Anhedonia. A flat, joyless feeling, because dopamine is suppressed too far.

Our Approach

Lowest effective dose. We titrate slowly. The goal is to quiet the noise, not silence appetite entirely. You become indifferent to the donut, not nauseous at the sight of it.
Protein floor. You need around 1 gram of protein per pound of your target body weight. If you lose weight by burning muscle, you are aging yourself.
Strength training. Heavy resistance work is non-negotiable. We are building a high-performance body, not just a smaller one.

Is Using a GLP-1 "Cheating"?

I ask my patients, "Is wearing glasses cheating?" If you are nearsighted, your biology fights your ability to see. You can squint harder, or you can use lenses that correct the focal length. If you have leptin resistance (your brain stops hearing the "you are full" signal) or hyperinsulinemia (chronically high insulin), your biology fights your ability to regulate energy. You can try harder (and fail, like 95% of dieters), or you can use a tool that corrects the signaling. The medication buys a behavioral window. While the noise is quiet, we build the habits (sleep, zone 2 cardio, whole foods, lifting). The drug is the runway. Your habits are the plane.

Guidance from the Clinic

"The danger is not the drug. The danger is using the drug to starve yourself into a frail, low-muscle body. Used correctly, with protein and iron, this is a longevity tool. Used poorly, it speeds up aging."

Stop fighting your biology.

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Scientific References

Lincoff AM, et al. Semaglutide and cardiovascular outcomes in obesity without diabetes. N Engl J Med. 2023. (SELECT trial.)
Volkow ND. GLP-1 receptor agonists for the treatment of substance use disorders. JAMA Psychiatry. 2023.
Drucker DJ. GLP-1 physiology informs the pharmacologic potential of glucagon-like peptide-1. Mol Metab. 2022.
Wilding JPH, et al. Once-weekly semaglutide in adults with overweight or obesity. N Engl J Med. 2021. (STEP-1 trial.)
Jastreboff AM, et al. Tirzepatide once weekly for the treatment of obesity. N Engl J Med. 2022. (SURMOUNT-1 trial.)

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