Orlistat debuted as Xenical 120-mg capsules in 1999. Its mechanism of action is inhibition of gastric and pancreatic lipases in the stomach lumen and small intestine.[10,11] Triglycerides in the diet cannot be enzymatically degraded into absorbable, free fatty acids. As a result, the amount of fat absorbed is reduced by 30%.[12,13] Orlistat was approved by the FDA for nonprescription sales as a 60-mg capsule on February 7, 2007. Company literature uses the trade names alli and Alli. The product gradually became available after FDA approval as the company developed its marketing plans. Xenical remains available.
Adverse effects due to orlistat are euphemistically referred to as treatment effects by the manufacturer. Those listed on the nonprescription label include gas with oily spotting, loose stools, and more frequent stools that may be hard to control. Collectively, all of these side effects can result in great discomfort and embarrassment. The Internet has several sites allowing orlistat users to exchange information about their experiences while taking it.[15,16,17] The manufacturer instituted a message board that accomplishes the same objective. Users report that with orlistat use, they noticed a "strange orange ring left in the toilet bowl." The pharmacist should peruse these sites to glean useful counseling tips for purchasers of orlistat.
The lay press has attempted to warn users of orlistat about its treatment effects. An example is the Newsweek article of June 25, 2007, entitled, "The Word is 'Leakage.' " The article's author highlights the possibility of soiling one's pants due to uncontrollable anal leakage.
Patients taking orlistat must commit to daily intake of a multivitamin containing beta-carotene and vitamins A, D, E, and K. As orlistat affects their absorption, failure to ingest them could lead to vitamin deficiencies, each with its well-known group of adverse effects.
Rare adverse effects of orlistat also appear in the medical literature. A 57-year-old female was prescribed orlistat 120 mg three times daily with meals; the dosage had been increased from a twice-daily regimen two months before the report. Her renal function had progressively worsened, and she reported general malaise, weakness, and loose oily stools several weeks prior to her hospital admission. Her urine contained numerous calcium oxalate crystals. Renal biopsy yielded a specimen that was examined with light microscopy. The investigators noted calcium oxalate crystals in the tubules and interstitium, hypothesizing that orlistat's effect on fat might have allowed the calcium to "soap out."
The Newsweek article also lauds GlaxoSmithKline for producing a variety of materials designed to allow patients to use orlistat without experiencing problems. The manufacturer sells a "Starter Pack" with comprehensive aids, but the pharmacist will not be able to read them unless one of the expensive packages is opened, after which it cannot be sold. For this reason, this article summarizes the various components.
"Hi." This booklet is a welcome guide that serves several purposes. It provides the unique code number the patient will need to register online for the myalliplan benefits. It also lists the various components of the Starter Pack and provides an overview of orlistat.
"Read Me First." This booklet urges patients to register for help at myalli.com. It also offers several basic points, such as expecting a steady and gradual weight loss, making a change in one's behavior, eating right, writing one's intake down, developing a routine, increasing the activity level, and sticking to the program. In several places, the handout stresses the importance of reducing fat intake (e.g., by cutting out all fried foods).
Quick Facts Cards. This is a set of four plastic, pocket-sized reminder cards with keys to success while on the program, such as tips on cooking, shopping, portion control, and snacking. They also give tips on limiting fat, foods to avoid, and best choices for nutrition.
Companion Guide. The patient should be instructed to peruse this booklet thoroughly before starting orlistat. In less than 60 small pages, it is a valuable discussion of the orlistat program, including appropriate expectations, patient commitments, adverse effects, the mechanism of orlistat, a body mass index calculation table, how to eat right, development of a support network, increasing one's activity level, and facing trouble spots.
Healthy Eating Guide. This booklet is a comprehensive guide to eating in a healthy, low-fat manner. It includes orlistat meal plans and provides the best choices for a variety of international foods and fast-food restaurants (e.g., Wendy's, Subway).
Calorie and Fat Counter. The orlistat user is urged to limit fat intake to minimize treatment effects. This booklet allows the patient to calculate precisely how many fat grams are in each meal.
Daily Journal. The manufacturer explains that the most valuable predictor of weight loss success is simply keeping an accurate record of food and drink intake. To that end, the final written component of the starter kit is a 14-page set of blank pages allowing the patient to record the item consumed, the amount, the calories it contains, and the fat grams.
US Pharmacist. 2007;32(10):10-15. © 2007 Jobson Publishing
Cite this: New Nonprescription Weight Loss Product - Medscape - Oct 01, 2007.