Getting diet pills in the U.S. depends on the type you’re looking for. One option is available over the counter at any pharmacy, but the more effective prescription medications require meeting specific health criteria and working with a doctor or telehealth provider. Here’s how each pathway works and what to expect.
Who Qualifies for Prescription Weight Loss Medication
Prescription weight loss drugs aren’t available to anyone who wants to lose a few pounds. You need to meet one of two thresholds: a BMI of 30 or greater, or a BMI of 27 or greater combined with a weight-related health condition like high blood pressure, type 2 diabetes, high cholesterol, or sleep apnea.
These criteria apply whether you see a doctor in person or use a telehealth service. Insurance companies use the same cutoffs when deciding whether to cover the medication, and they also require that you’re actively making lifestyle changes like adjusting your diet or exercising. If your insurer approves you initially, they’ll check back later to confirm you’ve lost a minimum percentage of your starting weight (typically 3% to 5%, depending on the drug) before authorizing refills.
The Over-the-Counter Option
The only FDA-approved over-the-counter weight loss pill is orlistat, sold under the brand name Alli. It works by blocking your intestines from absorbing about a quarter of the fat you eat. That unabsorbed fat passes through your digestive system, which means greasy or high-fat meals can cause oily stools, gas, and urgent bowel movements.
Alli is approved for adults 18 and older with a BMI of 25 or more. You can buy it at most pharmacies and drugstores without a prescription. It produces modest weight loss, and it works best when paired with a reduced-fat diet. No doctor’s visit is required, but the results are significantly smaller than what prescription medications deliver.
Getting a Prescription Through Your Doctor
Your primary care doctor can prescribe weight loss medication. At your appointment, expect a thorough review of your medical history, current symptoms, and any conditions that might make certain drugs risky. For example, if you have slow stomach emptying (gastroparesis), a doctor would avoid prescribing a GLP-1 medication because it works by slowing digestion further. If you have uncontrolled blood pressure or vision changes, those issues would need to be addressed first.
Good questions to bring to this appointment: How do the available medications compare to each other? Will my insurance cover it, and what’s the out-of-pocket cost if it doesn’t? Is there a generic version? Your doctor can also help you navigate prior authorization, which is the approval process most insurers require before they’ll pay for weight loss drugs.
Getting a Prescription Through Telehealth
Several telehealth platforms now prescribe weight loss medication entirely online. The process typically starts with a health questionnaire covering your weight, BMI, medical history, lifestyle habits, and what you’ve already tried for weight loss. A licensed provider reviews your answers and determines whether you qualify.
Some services connect you with a provider through video or phone calls, while others handle everything through secure messaging. A few platforms require in-person lab work, but many are fully remote. If you’re approved, the prescription is sent to a pharmacy for pickup or delivered to your home. The convenience is real, but so is the cost. Many telehealth weight loss services charge a monthly membership fee on top of the medication price, and insurance coverage varies widely by plan and platform.
What Prescription Medications Are Available
The prescription landscape includes several categories. Older appetite suppressants like phentermine and diethylpropion are typically prescribed for short-term use and cost relatively little. Combination drugs pair appetite suppression with other mechanisms. Then there are the newer GLP-1 receptor agonists, the class that includes semaglutide (Wegovy) and tirzepatide (Zepbound), which reduce appetite and slow digestion. These injectable medications produce the largest average weight loss but also carry the highest price tags.
Your doctor will match you to a medication based on your health profile, your weight loss goals, and what your insurance will cover. There’s no single “best” option for everyone.
Insurance and Cost Realities
Insurance coverage for weight loss drugs is inconsistent. Many plans do cover them, but nearly all require prior authorization. That means your doctor submits documentation proving you meet the BMI requirements and are making lifestyle changes, and then the insurer decides whether to approve it. This process can take days to weeks.
If your insurance doesn’t cover weight loss medication, or if you don’t have insurance, costs vary dramatically. Older generic drugs like phentermine can cost under $30 a month. Brand-name GLP-1 injections can exceed $1,000 a month without coverage. Manufacturer savings programs and pharmacy discount cards can reduce costs, but they don’t always apply to every drug or every situation.
Why to Avoid Unverified Sources
The popularity of GLP-1 drugs has created a flood of questionable options. Counterfeit versions are sold through unlicensed online sellers, and some medical spas and compounding pharmacies offer their own formulations. Compounded drugs are not FDA-approved, meaning they haven’t been tested for safety, effectiveness, or quality the way brand-name medications have. There’s no independent verification that a compounded injection actually contains the amount of active ingredient the label claims, and sterility can’t be guaranteed.
The FDA has been tightening regulations on compounded versions of semaglutide and tirzepatide. Neither drug currently appears on the FDA’s list of bulk substances with established clinical need, and the periods of enforcement flexibility that existed during drug shortages have largely ended. Compounding pharmacies operating under certain federal exemptions are now limited to filling four or fewer prescriptions per month for these drugs.
The safest route is always through a licensed provider and a licensed pharmacy. If a website offers weight loss injections without requiring any health screening, or if the price seems dramatically lower than retail, treat that as a red flag rather than a bargain.