Semaglutide and GLP-1 Therapy: A Practical Guide

GLP-1 medications like semaglutide have widened what medical weight care can offer, and they work best with real supervision: a full history, a dose raised slowly, and someone to call when side effects show up. This guide explains what semaglutide actually does, who it suits and who it does not, and what that supervised care looks like here, from Melissa Kolowitz, PA-C, at Aetheria Aesthetics & Wellness™ in Pittsburgh’s North Hills.

A note before we start: this is educational, not medical advice, and every decision below belongs in a real conversation with a provider who knows your history.

What is GLP-1, and what is semaglutide?

GLP-1 is a hormone your own gut makes when you eat. It tells the pancreas to release insulin, slows how quickly the stomach empties, and signals the brain that you are full (Cleveland Clinic). Semaglutide is a synthetic version of that hormone. It works by amplifying the same fullness and blood-sugar signals your body already uses (JAMA patient page).

It was first approved for type 2 diabetes, and the weight reduction seen in those studies led to its approval for weight management (NEJM, STEP 1). You will see it under brand names: Ozempic for diabetes, Wegovy for weight management, and Rybelsus as an oral tablet for diabetes. All of them are prescription medications, not something to source over the counter (FDA prescribing information).

How does semaglutide support weight loss?

By acting on GLP-1 receptors, semaglutide does three things at once:

• It lowers appetite. It works on the hunger centers of the brain, so many people feel satisfied with less food and notice fewer urges to snack (Cleveland Clinic).
• It slows the stomach. Food moves through more slowly, so you stay full longer.
• It steadies blood sugar. It prompts insulin when blood sugar is high and eases the post-meal spikes that drive cravings (Cleveland Clinic Journal of Medicine).

In a 68-week study of adults with obesity, those on semaglutide with diet and exercise lost about 15 percent of their body weight on average, against roughly 2 to 3 percent for diet and exercise alone, and close to a third lost 20 percent or more (NEJM, STEP 1). Individual results vary, and the medication is an addition to nutrition and activity, not a substitute for them. It targets the biology of appetite; your habits still do the daily work.

One honest caveat that shapes how we counsel patients: most people regain a large share of the weight if they stop (STEP 1 extension). Semaglutide manages obesity as an ongoing condition rather than curing it, which is why we plan for the long game from day one.

Who is a candidate, and who is not?

Semaglutide for weight management is intended for adults who meet FDA criteria (FDA prescribing information): a BMI of 30 or higher, or a BMI of 27 or higher with a weight-related condition such as high blood pressure, type 2 diabetes, high cholesterol, or sleep apnea.

It is not the right tool for a few cosmetic pounds. These are long-term, costly medications, and the evidence says you likely stay on therapy to hold the result. If you have ten pounds to lose for an event, we will say so and point you somewhere more sensible.

Some people should avoid semaglutide entirely. Do not use it if you have a personal or family history of medullary thyroid carcinoma or the MEN2 syndrome (the medication carries a boxed warning based on rodent studies), a history of pancreatitis, severe gastroparesis, a known allergy to it, or if you are pregnant or trying to conceive (FDA prescribing information). We use extra caution, and a longer conversation, with active gallbladder disease, kidney concerns, or a history of eating disorders. This is exactly why we take a full in-person history before writing anything.

How we start and adjust the dose

Semaglutide is a once-weekly injection just under the skin, from a prefilled pen, into the abdomen, thigh, or upper arm. The needle is very fine and most people find the shot nearly painless (Cleveland Clinic).

Treatment starts at a low dose and steps up gradually over roughly 16 weeks toward a maintenance dose, following the FDA-approved schedule (Wegovy dosing schedule). That slow climb is deliberate: it gives your body time to adjust and keeps nausea manageable. If a step does not sit well, we hold you there longer, or step back down, rather than push through. The published schedule is a framework a provider adapts to you, not a plan to follow on your own. Rotate injection sites week to week, keep pens refrigerated until first use, and if you ever miss a dose, call rather than guess.

What to expect in the first weeks and months

• Weeks 1 to 2. Appetite shifts often show up first. You may feel full sooner and think about food less. Mild digestive side effects are common early and when the dose increases.
• Months 2 to 3. As the dose climbs, weight reduction usually becomes more noticeable. Progress tends to come in steps and plateaus, not a straight line.
• Months 4 to 5. On the maintenance dose, alongside nutrition and activity, many people see a steadier trend. It can take several months of adjustments to find your effective dose (Cleveland Clinic).

Watch the trend over weeks, not the scale each morning. Semaglutide is meant to be a long-term therapy, so we think in months and years.

Managing side effects

Most side effects are digestive, most are mild to moderate, and most ease as your body adjusts (FDA prescribing information).

• Nausea is the most common, especially early or after a dose increase. Smaller, blander meals help, as does avoiding very fatty or fried food; ginger settles some stomachs (JAMA patient page). Persistent nausea is worth a call, since we can slow the schedule or add support.
• Diarrhea or constipation can go either way. Fluids, gradual fiber, and a daily walk help; ask before leaning on over-the-counter remedies (Cleveland Clinic GLP-1 diet guidance).
• Reflux or bloating comes from slower stomach emptying. Smaller meals and not lying down right after eating help (UCLA Health).
• Fatigue or lightheadedness often traces back to eating too little or mild dehydration. Do not skip meals; the idea is smaller portions, not starvation.

When to seek care right away

Call your provider or seek urgent care for severe stomach pain (with or without vomiting), persistent vomiting or dehydration, yellowing of the skin or eyes, signs of an allergic reaction such as swelling or trouble breathing, or any thoughts of self-harm. Rare but serious risks include pancreatitis and gallbladder problems, both more likely with very rapid weight loss (FDA prescribing information). If you take insulin or a sulfonylurea for diabetes, semaglutide can raise the risk of low blood sugar, so those doses often need adjusting.

Habits that make the medicine work better

The medication makes eating less easier; these habits help the result last.

• Protein first. Aim for roughly 20 to 30 grams per meal to help preserve muscle while you lose weight (JAMA patient page).
• Hydration. Eating less means drinking less by accident. Keep fluids up; it eases constipation and fatigue.
• Gentle, consistent movement. Even short daily walks, building toward about 150 minutes a week with some resistance work, help you lose fat rather than muscle.
• Eat on purpose. Because hunger quiets down, some people under-eat. Smaller portions of real food beat skipped meals.

Avoid crash diets on top of the medication; cutting too hard worsens dehydration, fatigue, and side effects.

How the program works at Aetheria

This is a provider-led program, supervised in person by Melissa Kolowitz, PA-C. It is not a prescription handed over with a “good luck.”

1. An in-person visit: your goals, history, and medications, and an honest read on whether this is the right tool for you.
2. A baseline health review, with labs when they help.
3. A personalized dose plan and hands-on teaching before your first injection.
4. Follow-up at each dose step to manage side effects and adjust.
5. Nutrition and activity guidance, and progress tracking.
6. A maintenance plan, because the goal is to hold the result, not just reach it.

Weight care also connects to the rest of what we do. A hormone and stress baseline through DUTCH testing can add context when sleep, stress, or plateaus are part of the story, and GLP-1 care sits inside the broader Metabolic Health Program.

Sources and further reading

• Cleveland Clinic: GLP-1 agonists
• NEJM: STEP 1 trial of once-weekly semaglutide
• FDA: Wegovy prescribing information
• JAMA: patient page on GLP-1 medications

Medical weight loss at Aetheria is supervised in person by Melissa Kolowitz, PA-C. Learn more on our medical weight loss page, read the shorter ten things to know about semaglutide, or book a clinical assessment.

This article is educational and does not constitute medical advice. Individual results vary. Every treatment decision is made at an in-person visit with a licensed provider who knows your history.