What to Know Before Starting a GLP-1: 12 Things to Ask

If you read nothing else, read this. GLP-1 receptor agonists like semaglutide and tirzepatide are prescription medications that require a consultation with a licensed clinician. They are most often used long-term, not for a single month. The most commonly reported side effects are gastrointestinal. Brand-name versions are FDA-approved; compounded versions are not approved as finished products. Plan for the cost every month and for what happens if you stop. And go into your first appointment with questions ready, because a good provider will welcome them.

The 12 items below expand each of those points into something you can actually act on.

GLP-1 receptor agonists mimic a gut hormone (glucagon-like peptide-1) that the body releases after eating. According to FDA prescribing information, these drugs slow how quickly the stomach empties and act on appetite signaling. Semaglutide is the active ingredient in Ozempic and Rybelsus (approved for type 2 diabetes) and Wegovy (approved for chronic weight management). Tirzepatide, a dual GIP/GLP-1 receptor agonist, is the active ingredient in Mounjaro (type 2 diabetes) and Zepbound (chronic weight management). Knowing the molecule, not just the brand, helps you ask sharper questions and compare what different providers are actually offering.

Efficacy figures should come from published trials or FDA labels, framed as study findings, not as a promise about your own result. In the STEP 1 trial of semaglutide 2.4 mg (Wilding et al., New England Journal of Medicine, 2021), participants experienced a mean weight reduction of about 14.9% over 68 weeks versus about 2.4% with placebo, alongside lifestyle intervention. In the SURMOUNT-1 trial of tirzepatide (Jastreboff et al., NEJM, 2022), mean reductions ranged by dose, with the highest dose group showing roughly 20.9% over 72 weeks. These are average study results under trial conditions with structured support. Individual results differ, and no one can promise you a specific outcome.

This is one of the most important things to understand before you pay for anything. Brand-name semaglutide and tirzepatide are FDA-approved. Compounded versions, which some telehealth providers offer at lower cash prices, are not FDA-approved as products. The FDA has stated that it does not review compounded drugs for safety, effectiveness, or quality before they reach patients. Compounding is legal under specific conditions and is done by licensed pharmacies, but a compounded preparation is not the same as an approved product. The FDA has also warned about dosing errors and adverse events associated with compounded GLP-1 products. Ask any provider directly: am I getting an FDA-approved product or a compounded one, and from what kind of pharmacy?

GLP-1 treatment is a recurring cost, and the number you see advertised is rarely the whole picture. Cash prices for brand-name medication can run several hundred to over a thousand dollars a month without insurance, and manufacturer programs change over time. NovoCare (Novo Nordisk's direct program for Wegovy) and LillyDirect (Eli Lilly's direct platform for Zepbound) sometimes publish self-pay pricing for eligible patients; verify the current figure and eligibility at the source, because these programs are updated frequently. Compounded programs from telehealth providers are often cheaper monthly but carry the FDA-approval caveat above. Whatever route you consider, do the annual math, not the monthly math.

According to the FDA prescribing information for both semaglutide and tirzepatide, the most commonly reported adverse reactions are gastrointestinal: nausea, diarrhea, vomiting, constipation, and abdominal pain. These are often more noticeable when starting or increasing the dose, which is why providers titrate slowly. The labels also carry serious warnings, including a boxed warning about thyroid C-cell tumors observed in rodent studies (with contraindications for people with a personal or family history of medullary thyroid carcinoma or MEN 2), and warnings related to pancreatitis, gallbladder problems, and other risks. This is exactly the kind of thing to review with a prescriber against your own history.

Here is a question many people only think to ask in hindsight. Significant weight loss by any method includes loss of lean body mass, not just fat. This is a documented feature of rapid weight loss generally and has been discussed in the GLP-1 research literature. Clinicians commonly recommend adequate protein intake and resistance training to help preserve muscle during treatment. None of that is a medical instruction here, just a flag: raise muscle preservation and protein on your first visit so it's part of your plan from day one rather than a fix later.

In the pivotal trials, the medication was paired with lifestyle intervention, including diet and activity changes. The drug changes appetite and fullness; it does not replace the habits that support health. Because these medications slow gastric emptying, some people find large or very fatty meals less comfortable. Thinking through how you'll eat, hydrate, and stay active before you start tends to make the early weeks smoother. A provider who only sells you a pen and never asks about your eating or activity is worth a second look.

This may be the single most underappreciated point. In a 2022 extension analysis of the STEP 1 participants (Wilding et al., Diabetes, Obesity and Metabolism), people who discontinued semaglutide regained, on average, about two-thirds of their lost weight within roughly a year, and many cardiometabolic improvements reverted toward baseline. The clinical framing is that obesity is treated as a chronic condition, and these medications are generally studied and used as ongoing therapy. So before you start, ask yourself and your provider: what is the plan for month 18, and what does maintenance look like and cost?

Telehealth GLP-1 providers such as Henry Meds, Ivim Health, ShedRx, Eden, Measured Health, MEDVi, TrimRx, GobyMeds, Elevate Health, and Brello Health connect you with licensed clinicians remotely, often with fast intake and cash-pay clarity. An in-person clinic or your own primary care physician offers a physical exam, on-site labs, and a clinician with full access to your record. Neither is universally better. The table above lays out where each tends to win. If you have a complex medical history, an established in-person relationship has real advantages; if you want convenience and transparent cash pricing, telehealth may fit. Competitors in this space, including Ro, Hims & Hers, Mochi Health, Found, Noom Med, Calibrate, LifeMD, PlushCare, WeightWatchers Clinic, and Form Health, operate on similar models with different specifics.

A real telehealth provider will require a consultation with a licensed clinician before any prescription, will be transparent about whether the medication is brand-name or compounded and which pharmacy fills it, and will collect a genuine medical history. Walk away from any service that offers to ship GLP-1 medication without a consultation, sells "research chemicals" or "not for human use" peptides, or sources from grey markets. Those are not legitimate medical pathways. Services like eMed, DrHouse, and CareValidate emphasize the clinical consultation and testing side of the process; whatever provider you choose, confirm a licensed clinician is genuinely in the loop.

The FDA labels list contraindications and precautions that only a clinician can apply to you. These include a personal or family history of medullary thyroid carcinoma or Multiple Endocrine Neoplasia syndrome type 2, and a known hypersensitivity to the drug. The labels also flag caution with pregnancy and certain conditions. This is why a thorough intake matters: disclose your full medical history, current medications, and any history of pancreatitis, gallbladder disease, or eating disorders. A provider who rushes past this is not doing the job. GLP-1 treatment is for adults 18 and older, and the decision is always individualized by a licensed prescriber.

Walk in with these written down: (1) Is this brand-name and FDA-approved, or compounded? (2) What is the total monthly and annual cost, and what happens to the price if I need a higher dose? (3) Who is the prescribing clinician, and will I see the same person each time? (4) What labs do you require, and how are they done? (5) How will we manage side effects and titration? (6) What is the plan for muscle, protein, and activity? (7) What does maintenance look like, and what's the off-ramp if I stop? A provider's willingness to answer these clearly is itself a useful signal.

This article is educational and is not medical advice. It is intended for adults 18 and older. GLP-1 medications are prescription drugs, and obtaining one requires a consultation with a licensed healthcare provider who determines whether treatment is appropriate for you. Compounded medications are not FDA-approved as finished products. Efficacy figures cited here are findings from specific published trials or FDA labeling and describe average study results, not promised outcomes for any individual. Prices referenced are attributed to the relevant provider or manufacturer and change frequently; verify current pricing and eligibility at the source. GLP1Samples does not sell, ship, or prescribe medication, and does not accept payment for editorial placement.