Getting a prescription weight loss medication involves meeting specific medical criteria, finding a prescriber, and navigating cost and availability. The standard threshold is a BMI of 30 or higher, or a BMI of 27 or higher with at least one weight-related health condition such as type 2 diabetes, high blood pressure, high cholesterol, sleep apnea, or cardiovascular disease. Here’s what the process looks like from start to finish.
Who Qualifies for Weight Loss Medication
The FDA uses BMI as the primary gatekeeper. If your BMI is 30 or above, you’re eligible regardless of other health conditions. If your BMI falls between 27 and 29.9, you’ll need a documented weight-related condition to qualify. The most common qualifying conditions are type 2 diabetes, high blood pressure, high cholesterol, sleep apnea, and cardiovascular disease.
For adolescents, the threshold is a BMI at or above the 95th percentile for their age and sex, or the 85th percentile if they also have a weight-related condition like type 2 diabetes or high blood pressure. Pediatric patients also need a documented history of trying lifestyle changes first without enough success.
Certain conditions disqualify you from specific medications. If you’re pregnant or breastfeeding, GLP-1 drugs are off the table due to insufficient safety data. A personal or family history of a rare thyroid cancer called medullary thyroid carcinoma rules out both semaglutide (Wegovy) and liraglutide (Saxenda). Uncontrolled high blood pressure, a history of seizures, or active eating disorders are contraindications for some oral options. Your prescriber will screen for these before writing a prescription.
Where to Get a Prescription
You have several options for finding a prescriber, and the right one depends on your situation and budget.
Your primary care doctor is the most straightforward starting point. Most PCPs can prescribe weight loss medications and already have your medical history. If your doctor isn’t comfortable prescribing them or doesn’t have experience with newer medications, ask for a referral to an obesity medicine specialist or endocrinologist.
Telehealth platforms have become a popular route. Several companies now offer virtual consultations specifically for weight management, often with faster appointment availability than in-person clinics. These visits typically involve a health questionnaire, a video consultation, and lab work either through their partner labs or your own doctor. Turnaround from first appointment to prescription can be a matter of days.
Weight management clinics and bariatric centers offer a more comprehensive approach, often pairing medication with nutritional counseling, behavioral support, and regular monitoring. These tend to be a better fit if you have complex health conditions or want structured, long-term support.
What to Expect at Your First Visit
Your provider will take your height and weight, review your medical history, and ask about previous weight loss attempts. They’ll want to know about any medications you currently take, since several weight loss drugs interact with antidepressants, seizure medications, and opioids.
Most prescribers order baseline blood work before starting treatment. Common tests include a comprehensive metabolic panel, which checks kidney function, liver enzymes, electrolytes, and blood sugar. If you have diabetes risk factors, expect a hemoglobin A1C test that reflects your average blood sugar over the past two to three months. A lipid panel measuring cholesterol and triglycerides is standard if you have cardiovascular risk. Thyroid function testing is common as well, especially before starting GLP-1 medications. Some providers also check vitamin D, B12, and iron levels if nutritional deficiencies are suspected.
This blood work serves two purposes: it identifies any conditions that might rule out certain medications, and it gives your doctor a baseline to track how the medication affects your body over time.
Types of Medications Available
Six prescription medications are currently FDA-approved for long-term weight management, and they work through different mechanisms. Your provider will recommend one based on your health profile, preferences, and what your insurance covers.
Injectable GLP-1 Medications
These are the medications driving most of the current demand. They mimic a gut hormone called GLP-1 that targets appetite-regulating areas of the brain, making you feel less hungry and satisfied sooner.
Semaglutide (Wegovy) is a once-weekly injection and one of the most effective options, with clinical trials showing average weight loss of around 15% of body weight. Tirzepatide (Zepbound) is also a weekly injection that targets two gut hormones instead of one, and trials have shown even greater average weight loss. Liraglutide (Saxenda) is a daily injection, older than the other two and generally producing more modest results, but still effective for many people.
Oral Medications
If you prefer a pill over injections, there are three long-term options. Phentermine-topiramate (Qsymia) combines an appetite suppressant with a seizure medication that also reduces hunger; it’s taken once daily and is one of the more effective oral options. Naltrexone-bupropion (Contrave) pairs an addiction treatment drug with an antidepressant, working on brain pathways involved in cravings and reward. Orlistat (Xenical) works differently from the others: instead of affecting appetite, it blocks your gut from absorbing about a third of the fat you eat. It’s taken three times daily with meals.
There’s also phentermine on its own, which is FDA-approved only for short-term use of a few weeks. Some providers prescribe it as a bridge while patients start a longer-term medication.
Dealing With Cost and Insurance
Cost is the biggest barrier for most people. The injectable GLP-1 medications carry list prices above $1,000 per month without insurance. Oral options tend to be less expensive, and orlistat is available over the counter at a lower dose (sold as Alli).
Insurance coverage varies wildly. Some plans cover weight loss medications fully or with a standard copay. Others exclude them entirely or require prior authorization, meaning your doctor must submit documentation proving medical necessity before the insurer approves the prescription. Check with your insurance company before your appointment so you know what’s covered and what hoops you’ll need to jump through.
If your insurance doesn’t cover these drugs, you have a few options. Manufacturer savings programs can reduce costs significantly for eligible patients. Some employers have created separate reimbursement programs specifically for Wegovy and Zepbound, contributing a set amount per month. These programs change frequently, so check the manufacturer websites (NovoCare for Wegovy, LillyDirect for Zepbound) for the latest offers.
Telehealth weight loss platforms sometimes negotiate lower pricing or offer bundled plans that include the medication, consultations, and monitoring for a flat monthly fee. It’s worth comparing several before committing.
What About Compounded Versions
During recent shortages of semaglutide and tirzepatide, compounding pharmacies stepped in to produce custom-made versions of these drugs at lower prices. However, as of early 2026, neither tirzepatide nor semaglutide appears on the FDA’s official drug shortage list. This matters because compounding pharmacies had legal flexibility to produce copies of these drugs specifically because they were in shortage. With supply stabilizing, the FDA has been tightening enforcement.
Compounded medications are not FDA-approved and don’t go through the same testing for safety, potency, or sterility as brand-name drugs. If you’re considering a compounded version, make sure the pharmacy is licensed and regulated, and discuss the risks with your prescriber.
What Happens After You Start
Most medications are started at a low dose and gradually increased over several weeks to minimize side effects. For the GLP-1 injectables, this dose escalation period typically takes two to four months before you reach the full therapeutic dose. Nausea, constipation, and decreased appetite are the most common early side effects and usually improve as your body adjusts.
Your provider will schedule follow-up appointments to check your progress, adjust your dose, and repeat blood work. Expect kidney function, liver enzymes, and blood sugar to be monitored periodically, especially in the first year. Weight loss is typically fastest in the first six months, then gradually slows.
These medications work best alongside changes to eating patterns and physical activity. They reduce hunger and cravings, which makes those behavioral changes easier to sustain, but the medication alone isn’t the whole picture. Most prescribers expect you to engage with some form of lifestyle modification alongside the drug, whether that’s a structured program or guidance from a dietitian.