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Xenical Side Effects

Common side effects of Xenical include gastrointestinal symptoms such as:

  • Fecal incontinence
  • Flatulence with oily spotting
  • Frequent or urgent bowel movements
  • Oily, loose stools

The chance of gastrointestinal side effects is increased if Xenical is taken with a very high-fat meal.

Things to Know, Precautions, Things to Ask Your Physician: 

Tell your doctor about all existing conditions you may have that could affect your treatment with Xenical, including the following:

  • Gallbladder problems
  • Hypothyroidism

Xenical is not recommended for use in patients with any of the following conditions:

  • Breast feeding
  • Chronic malabsorption syndrome
  • Cholestasis (impaired bile flow)
  • Pregnancy

Patients taking Xenical are advised to take a multivitamin supplement containing fat-soluble vitamins (vitamins D, E, K, and beta carotene) to ensure adequate nutrition. Multivitamin supplements should be taken once a day at least 2 hours before or after taking Xenical.

The safety of Xenical has not established for treatment lasting more than 4 years.

What to Avoid When Taking the Drug: 

Avoid eating high-fat foods while using Xenical. A reduced-calorie diet of no more than 30 percent calories from fat is recommended in order for Xenical to be most effective.

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