Endocrinology Book

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OrlistatAka: Xenical

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  1. Indication for Obesity Management
    1. Body Mass Index over 30 kg/m2
    2. Body Mass Index over 27 kg/m2 with comorbidity
      1. Diabetes Mellitus
      2. Hypertension
      3. Dyslipidemia
  2. Mechanism
    1. Pentanoic acid ester binds gastric, pancreatic Lipase
    2. Lipase Inhibitor (Blocks Fat absorption)
      1. Decreased Triglyceride absorption
      2. Decreased Cholesterol absorption
  3. Pharmacokinetics
    1. Minimal systemic absorption
  4. Efficacy
    1. Combined results of two large Placebo controlled trials
      1. Year one
        1. Orlistat: 9-10 kg loss (10% of baseline weight)
        2. Placebo: 6 kg (6% of baseline weight)
      2. Year two
        1. Orlistat: 1.5-3 kg regained weight
        2. Placebo: 4-6 kg regained weight
    2. References
      1. Sjostrom (1998) Lancet 352:167
      2. Davidson (1999) JAMA 281:235
  5. Adverse effects
    1. Gastrointestinal side effects (40%)
      1. Flatus with discharge
      2. Oily stool with spotting
      3. Fecal urgency
      4. Fecal Incontinence
      5. Abdominal Pain
    2. Fat soluble Carotenoid (fruit, vegetable) malabsorption
    3. Fat soluble vitamin malabsorption: No supplement needed
      1. Vitamin A
      2. Vitamin D
      3. Vitamin E
      4. Vitamin K
  6. Drug Interactions
    1. Does not interfere with absorption of other medications
      1. Coumadin
      2. Oral Contraceptives
      3. Antihypertensives
  7. Dosing
    1. Take three times daily with each meal containing fat
    2. Prescription dose: 120 mg orally three times daily
    3. OTC dose: 60 mg orally three time daily
  8. Precautions
    1. Avoid fat-soluble vitamins within 2 hours of orlistat
    2. Maintain dietary fat intake <30% of calories
  9. References
    1. (1999) Med Lett Drugs Ther 41(1055):55

orlistat (C0076275)

Definition (NCI)A reversible active-site inhibitor of gastrointestinal lipases. Orlistat forms a covalent bond with the active serine site in gastric and pancreatic lipases, thereby inhibiting their activity and preventing dietary fat from being hydrolyzed and absorbed. (NCI04)
ConceptsOrganic Chemical (T109) , Pharmacologic Substance (T121)
Englishorlistat, ORLISTAT PREPARATION, tetrahydrolipstatin, THLP
Spanishorlistat
CreditsDerived from the NIH UMLS (Unified Medical Language System)


Xenical (C0732649)

ConceptsOrganic Chemical (T109) , Pharmacologic Substance (T121)
EnglishRoche brand of orlistat, Xenical
CreditsDerived from the NIH UMLS (Unified Medical Language System)



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