Orlistat is a medication widely used in the UK to aid weight loss by preventing the absorption of dietary fats. It functions by inhibiting the action of lipase, an enzyme responsible for breaking down fats in the intestine. By impeding this process, Orlistat reduces the absorption of fats by up to 30%, leading to decreased calorie intake and subsequent weight loss.

Available both over-the-counter and via prescription under brand names like Alli and Xenical, Orlistat is typically recommended for individuals with a BMI (Body Mass Index) over 30 or those with a BMI over 28 who have additional risk factors such as high blood pressure or diabetes. It's often suggested in conjunction with a reduced-calorie diet and exercise regimen to maximize its effectiveness.

However, Orlistat can cause side effects such as oily stools, flatulence, abdominal pain, and an increased urgency to have bowel movements due to the undigested fat passing through the digestive system. It may also interfere with the absorption of fat-soluble vitamins, necessitating the use of supplements.

Orlistat is regulated and available in the UK, offering an option for individuals seeking pharmaceutical aid to manage their weight. As with any medication, it's crucial to consult a healthcare professional before starting Orlistat to ensure its suitability and minimize potential risks.