TELOTRISTAT ETHYL Drug Interactions: What You Need to Know

INTERACTIONS CYP3A4 Substrates (e.g., midazolam) and CYP2B6 Substrates (e.g., bupropion, efavirenz): Efficacy of concomitant drugs may be decreased; monitor patients’ response and consider increasing the dosage of the concomitant drug, if necessary. ( 7.1 )

7.1 CYP3A4 Substrates Concomitant use of Xermelo may decrease the efficacy of drugs that are CYP3A4 substrates (e.g., midazolam) by decreasing their systemic exposure. Monitor patients’ response to CYP3A4 substrates when co-administered with Xermelo and consider increasing the dosage of the interacting drug, if necessary <span class="opacity-50 text-xs">[see Clinical Pharmacology ( 12.3 )]</span> .

7.2 CYP2B6 Substrates Concomitant use of Xermelo may decrease the efficacy of drugs that are CYP2B6 substrates (e.g., bupropion, efavirenz) by decreasing their systemic exposure. Monitor patients’ response to CYP2B6 substrates when co-administered with Xermelo and consider increasing the dosage of the interacting drug, if necessary <span class="opacity-50 text-xs">[see Clinical Pharmacology ( 12.3 )]</span> .

7.3 Short-Acting Octreotide Concurrent administration of short-acting octreotide with Xermelo significantly decreased the systemic exposure of telotristat ethyl and telotristat, the active metabolite. If treatment with short-acting octreotide is needed in combination with Xermelo, administer short-acting octreotide at least 30 minutes after administration of Xermelo <span class="opacity-50 text-xs">[see Clinical Pharmacology ( 12.3 )]</span> .

Xermelo is contraindicated in patients with a history of a hypersensitivity reaction to telotristat. Reactions have included angioedema, rash and pruritis. History of hypersensitivity to telotristat. ( 4 )

AND PRECAUTIONS Constipation: Xermelo reduces bowel movement frequency; monitor patients for constipation, and/or severe persistent or worsening abdominal pain.

Discontinue

Xermelo if constipation or abdominal pain develops. ( 5.1 )

5.1 Constipation Xermelo reduces bowel movement frequency and may lead to constipation. Serious complications of constipation have been reported during clinical trials and postmarketing. In a 12-week, placebo-controlled trial, in which patients had 4 or greater bowel movements per day, 2 out of 45 patients treated with a higher than recommended dosage of Xermelo reported constipation. In one patient the constipation was serious, resulting in hospitalization. During the 36-week extension period with higher than the recommended dosage of Xermelo, 10 of 115 patients reported constipation, with individual reports of intestinal perforation, obstruction, and fecaloma. In another 12-week, placebo-controlled trial in which patients had less than 4 bowel movements per day, 4 out of 25 patients treated with the recommended dosage of Xermelo reported constipation. Serious complications of constipation in patients treated with Xermelo at the recommended dosage (e.g., intestinal obstruction) have also been reported in the postmarket setting. Most patients had additional risk factors, including underlying disease and concomitant constipating medications. Given that patients with metastatic carcinoid tumors may have impaired integrity of the gastrointestinal tract wall, monitor for the development of constipation and/or severe, persistent, or worsening abdominal pain in patients taking Xermelo.

Discontinue

Xermelo if severe constipation or severe persistent or worsening abdominal pain develops [see Dosage and Administration ( 2 ), Adverse Reactions ( 6.1 )] .