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INFOMATION:
Orlistat (also known as tetrahydrolipstatin) is a drug designed to treat obesity. It is marketed as a prescription drug under the trade name Xenical by Roche in most countries, and is sold over-the-counter as Alli[2] by GlaxoSmithKline in the United Kingdom and the United States.[3] Its primary function is preventing the absorption of fats from the human diet by acting as a lipase inhibitor, thereby reducing caloric intake. It is intended for use in conjunction with a healthcare provider-supervised reduced-calorie diet.[4]
Medical uses
Orlistat is used for the treatment of obesity. The amount of weight loss achieved with orlistat varies. In one-year clinical trials, between 35.5% and 54.8% of subjects achieved a 5% or greater decrease in body mass, although not all of this mass was necessarily fat. Between 16.4% and 24.8% achieved at least a 10% decrease in body fat. After orlistat was stopped, a significant number of subjects regained weight—up to 35% of the weight they had lost.
The incidence of type 2 diabetes in an obese population over four years is decreased with orlistat (6.2%) compared to placebo (9.0%). Long-term use of orlistat also leads to a modest reduction in blood pressure (mean reductions of 2.5 and 1.9 mmHg in systolic and diastolic blood pressure respectively).
Contraindications
Orlistat is contraindicated in:
- Malabsorption
- Hypersensitivity to orlistat
- Reduced gallbladder function (e.g. after cholecystectomy)
- Pregnancy and breastfeeding
- Use caution with: obstructed bile duct, impaired liver function, and pancreatic disease
Side effects
The primary side effects of the drug are gastrointestinal-related, and include steatorrhea (oily, loose stools with excessive flatus due to unabsorbed fats reaching the large intestine), fecal incontinence and frequent or urgent bowel movements. GlaxoSmithKline recommends that all users be cautious of the possible side effects until they "have a sense of any treatment effects". To minimize these effects, foods with high fat content should be avoided; the manufacturer advises consumers to follow a low-fat, reduced-calorie diet. Oily stools and flatulence can be controlled by reducing the dietary fat content to somewhere in the region of 15 grams per meal. The manual for Alli makes it clear that orlistat treatment involves aversion therapy, encouraging the user to associate eating fat with unpleasant treatment effects.
According to Roche, side effects are most severe when beginning therapy and may decrease in frequency with time; this is supported by the results of the XENDOS study, which found that only 36% of people had gastrointestinal adverse effects during their fourth year of taking orlistat, whereas 91% of study subjects had experienced at least one GI-related side effect during the first year of treatment. It has also been suggested that the decrease in side effects over time may be associated with long-term compliance with a low-fat diet.
The side effect profile of orlistat led US consumer group Prescription Access Litigation (PAL) to award its first 2007 "Bitter Pill Award" to GlaxoSmithKline—the 'With Allies Like This, Who Needs Enemas?' Award.
On 26 May 2010, the U.S. Food and Drug Administration (FDA) approved a revised label for Xenical to include new safety information about cases of severe liver injury that have been reported rarely with the use of this medication.
An analysis of over 900 orlistat users in Ontario showed that their rate of acute kidney injury was more than triple that of non-users. The putative mechanism for this effect is postulated to be excessive oxalate absorption from the gut and its subsequent deposition in the kidney, with excessive oxalate absorption being a known consequence of fat malabsorption.
An April 2013 study published in the British Medical Journal looked at 94,695 patients receiving orlistat in the UK between 1999 and 2011. This study showed no evidence of an increased risk of liver injury during treatment. They concluded:
The incidence of acute liver injury was higher in the periods both immediately before and immediately after the start of orlistat treatment. This suggests that the observed increased risks of liver injury linked to the start of treatment may reflect changes in health status associated with the decision to begin treatment rather than any causal effect of the drug.Long-term
Despite a higher incidence of breast cancer amongst those taking orlistat in early, pooled clinical trial data—the analysis of which delayed FDA review of orlistat—a two-year study published in 1999 found similar rates between orlistat and placebo (0.54% versus 0.51%), and evidence that tumors predated treatment in 3 of the 4 participants who had them. There is evidence from an in vitro study to suggest that the introduction of specific varied preparations containing orlistat, namely the concurrent administration of orlistat and the monoclonal antibody trastuzumab, can induce cell death in breast cancer cells and block their growth.
A 2006 animal study linked orlistat with aberrant crypt foci (ACF), lesions found in the colon which are believed to be one of the earliest precursors of colon cancer.
Precautions
Absorption of fat-soluble vitamins and other fat-soluble nutrients is inhibited by the use of orlistat. A multivitamin tablet containing vitamins A, D, E, K, and beta-carotene should be taken once a day, at bedtime, when using orlistat.
On 4 June 2009, the U.S. Food and Drug Administration released its quarterly list of drugs that are under investigation for potential safety issues or new safety information. Orlistat was included in the list as having a "Potential Signal of Serious Risk" of liver toxicity, meaning that a potential risk of liver toxicity was identified based on reports to the FDA Adverse Event Reporting System between October and December 2008. Isolated cases of orlistat-associated liver problems have been reported before. On 24 August, the FDA reported that it would investigate 30 cases of liver damage reported between 1999 and October 2008 in patients taking orlistat, including six cases of liver failure.
Interactions
Orlistat may reduce plasma levels of ciclosporin (also known as "cyclosporin" or "cyclosporine", trade names Sandimmune, Gengraf, Neoral, etc.), an immunosuppressive drug frequently used to prevent transplant rejection; the two drugs should therefore not be administered concomitantly. Orlistat can also impair absorption of the antiarrhythmic amiodarone.
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