To get prescription-strength orlistat (sold as Xenical), you need a BMI of 30 or higher, or a BMI of 27 or higher with at least one weight-related health condition such as high blood pressure, diabetes, or high cholesterol. You can get the prescription through an in-person doctor visit or through a telehealth consultation. A lower-dose version (Alli) is available over the counter without a prescription.
Who Qualifies for a Prescription
The FDA approved prescription orlistat for two groups of patients. The first is anyone with a BMI of 30 or above, which is the clinical threshold for obesity. The second is anyone with a BMI of 27 or above who also has a related risk factor like type 2 diabetes, high blood pressure, or abnormal cholesterol levels. If you’re unsure of your BMI, you can calculate it using your height and weight with any online BMI calculator.
Your doctor will also review your medical history to rule out conditions that make orlistat a poor fit. If you have chronic malabsorption syndrome (where your gut already struggles to absorb nutrients) or cholestasis (a bile flow problem), orlistat won’t be prescribed. People taking certain medications, particularly those for organ transplant rejection or thyroid conditions, may need special timing or monitoring because orlistat can interfere with how those drugs are absorbed.
In-Person vs. Telehealth Prescriptions
The most straightforward path is scheduling an appointment with your primary care doctor. Come prepared with your weight history, any previous diet or exercise attempts, and a list of current medications. Doctors are more likely to prescribe orlistat when you can show you’ve already tried lifestyle changes and need additional support. The visit itself is typically quick once eligibility is confirmed.
Telehealth platforms are another option. During a virtual consultation, a licensed physician will evaluate your medical history, current health status, and weight loss goals. Most platforms require you to provide accurate height and weight measurements, and some may ask you to upload a photo or step on a scale during a video call. If the provider determines you qualify, they can send the prescription directly to your pharmacy. The key requirement is that the consultation must be with a licensed doctor through an approved telehealth platform, not a website that simply sells the medication without a real medical evaluation.
Prescription Strength vs. Over-the-Counter
Orlistat comes in two strengths. The prescription version is 120 mg, taken three times a day with each fat-containing meal. The over-the-counter version, Alli, contains 60 mg per capsule, exactly half the prescription dose. Both work the same way: they block enzymes in your gut that break down dietary fat, so about 30% of the fat you eat passes through your body unabsorbed (at the 120 mg dose).
If you don’t meet the BMI criteria for a prescription, or you’d rather skip the doctor visit, Alli is available at most pharmacies without any prescription. It’s a reasonable starting point, though the lower dose means a smaller effect on fat absorption. Many people try Alli first and move to the prescription strength if they need more support.
What to Expect for Weight Loss
Orlistat works best as part of a reduced-calorie, lower-fat diet. In a large review of 17 clinical trials covering over 10,000 patients, people taking the prescription dose were about 74% more likely to lose at least 5% of their body weight over one year compared to those on diet alone. They were nearly twice as likely to hit the 10% weight loss mark. These are meaningful numbers, but they also make clear that orlistat is a tool that amplifies diet efforts rather than replacing them.
You take each capsule during or up to one hour after a meal that contains fat. If a meal has no fat, you skip the dose. Taking more than 120 mg three times daily provides no additional benefit.
Managing Side Effects With Diet
The most common side effects are gastrointestinal: oily or fatty stools, urgent bowel movements, gas with oily discharge, and more frequent bowel movements. These happen because the unabsorbed fat has to go somewhere. They tend to be worst in the first few weeks and improve as your body adjusts and as you learn to manage your fat intake.
The single most effective way to reduce these effects is to keep each meal’s fat content moderate. Spreading your daily fat intake evenly across three meals helps more than eating a low-fat breakfast and lunch followed by a high-fat dinner. Most people find that keeping meals to around 15 to 20 grams of fat each minimizes discomfort. A meal with 40 or 50 grams of fat while on orlistat will almost certainly cause noticeable GI symptoms.
Because orlistat reduces fat absorption, it also reduces absorption of fat-soluble vitamins (A, D, E, and K). Taking a daily multivitamin at bedtime, at least two hours before or after your orlistat dose, helps compensate for this.
Cost and Insurance Coverage
Prescription orlistat is not cheap. A one-month supply is 90 capsules (three per day), and without insurance, generic orlistat runs roughly $634 to over $700 for that quantity. Brand-name Xenical costs more. Insurance coverage varies widely. Some plans cover it, especially if you have documented obesity-related conditions, while others classify it as a lifestyle medication and exclude it.
Before filling the prescription, check with your insurance provider about coverage. If it’s not covered, pharmacy discount programs can sometimes lower the price. For comparison, over-the-counter Alli typically costs between $30 and $60 for a month’s supply, making it a significantly cheaper option if the lower dose meets your needs.