Online Orlistat (Xenical)
Weight Management • Educational only; not medical advice. Prescriptions at clinician discretion.
Overview
Orlistat is a pharmacologic anti-obesity agent that works by inhibiting gastrointestinal lipases — enzymes responsible for breaking down dietary fats. By preventing fat absorption, it reduces caloric intake and assists in long-term weight management. Originally developed by Roche and approved in 1999, orlistat is marketed both as Xenical (120 mg) by prescription and Alli (60 mg) as an over-the-counter formulation.
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Dr. Annie Casta, M.D., FAAP
Pediatrics Specialist
Providing compassionate pediatric care, wellness exams, and preventive treatments for children and adolescents.
Learn MoreDr. Jorge Trapaga, ARNP
Family Medicine & Primary Care
Specializing in primary care, chronic disease management, and wellness services for adults and families.
Meet Dr. TrapagaUses
Orlistat is indicated for weight loss and weight maintenance in overweight or obese adults with a body mass index (BMI) ≥ 30 kg/m² or ≥ 27 kg/m² in the presence of comorbidities such as diabetes, hypertension, or dyslipidemia. It also helps reduce the risk of weight regain after initial loss.Dosage & Administration
The usual adult dose is 120 mg three times daily with each fat-containing meal; the OTC dose (Alli) is 60 mg three times daily. Orlistat should be taken during or up to one hour after the meal. If a meal is missed or contains no fat, the dose should be skipped. Patients should take a daily multivitamin supplement containing vitamins A, D, E, and K, at least 2 hours after orlistat.Side Effects & Warnings
Common effects include oily stools, flatulence with discharge, and urgent bowel movements — all due to unabsorbed fat in the stool. Rare but serious side effects include liver injury, kidney stones, and fat-soluble vitamin deficiency. Contraindicated in chronic malabsorption syndrome or cholestasis.Patient Considerations
Orlistat is most effective when combined with a reduced-calorie, low-fat diet. Patients should maintain adequate hydration and regular physical activity. It is not a stimulant, making it suitable for long-term therapy.Ready for next steps?
Frequently asked questions
Can orlistat be used with other weight-loss drugs?
Combination with stimulants is not recommended; consult a physician before use.
Does it affect carbohydrate absorption?
No, it only blocks dietary fat digestion.
Will I regain weight after stopping it?
Maintaining lifestyle changes prevents rebound weight gain.
Government / NIH sources
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