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Generic Name: telotristat ethyl (tel OH tri stat ETH il)
Brand Name: Xermelo
Physician reviewed Xermelo patient information - includes Xermelo description, dosage and directions.
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Drug Information:
Xermelo works by blocking the production of serotonin in the body. In people who have carcinoid syndrome, serotonin is over-produced and causes symptoms of diarrhea or frequent bowel movements, stomach pain, and flushing (warmth, redness, or tingly feeling). Xermelo is used to treat carcinoid syndrome diarrhea. Xermelo may also be used for purposes not listed in this medication guide. Follow all directions on your medicine label and package. Tell each of your healthcare providers about all your medical conditions, allergies, and all medicines you use. Learn more

Xermelo Side Effects

Xermelo Side Effects

Note: This document contains side effect information about telotristat. Some of the dosage forms listed on this page may not apply to the brand name Xermelo.

In Summary

Common side effects of Xermelo include: constipation. See below for a comprehensive list of adverse effects.

For the Consumer

Applies to telotristat: oral tablet

Along with its needed effects, telotristat (the active ingredient contained in Xermelo) may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor immediately if any of the following side effects occur while taking telotristat:

Incidence not known

  • Severe constipation
  • severe stomach pain

Some side effects of telotristat may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

More common

  • Bloating or swelling of the face, arms, hands, lower legs, or feet
  • decreased appetite
  • discouragement
  • excess air or gas in the stomach or intestines
  • feeling sad or empty
  • fever
  • full feeling
  • headache
  • irritability
  • lack of appetite
  • loss of interest or pleasure
  • nausea
  • passing gas
  • rapid weight gain
  • tingling of the hands or feet
  • tiredness
  • trouble concentrating
  • trouble sleeping
  • unusual weight gain or loss

For Healthcare Professionals

Applies to telotristat: oral tablet


The most commonly reported side effects include nausea, headache, increased gamma-glutamyltransferase (GGT) and depression.


Very common (10% or more): Nausea (up to 13%)

Common (1% to 10%): Flatulence, abdominal distention, gastrointestinal pain, constipation, abdominal pain/upper and lower abdominal pain

Frequency not reported: Fecaloma

Nervous system

Very common (10% or more): Headache (up to 11%)


Common (1% to 10%): Increased gamma-glutamyltransferase (GGT)

Frequency not reported: Increased alkaline phosphatase, increased alanine aminotransferase, increased aspartate aminotransferase


Common (1% to 10%): Depression


Common (1% to 10%): Peripheral edema


Common (1% to 10%): Decreased appetite


Common (1% to 10%): Pyrexia

Editorial References and Review

Medically reviewed by BestRx Medical Team Last updated on 1/1/2020.

Source: Drugs.com Xermelo