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Drug Interactions between telotristat and tretinoin

This report displays the potential drug interactions for the following 2 drugs:

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Interactions between your drugs

Moderate

tretinoin telotristat ethyl

Applies to: tretinoin and telotristat

MONITOR: Concomitant use of moderate CYP450 3A4 inducers with tretinoin (systemic) may decrease the plasma concentration of tretinoin, which is a CYP450 3A4 substrate. Reduced efficacy of tretinoin may occur. Studies document the interaction between endogenous retinoids and CYP450 3A4 inducers (e.g., carbamazepine, phenytoin, phenobarbital) showing decreased concentration of the retinoids and reduced efficacy. While clinical data specific to tretinoin are not available, similar effects may occur.

MANAGEMENT: The manufacturer recommends monitoring patients for reduced efficacy of tretinoin.

References (8)
  1. (2023) "Product Information. Jamp Tretinoin (tretinoin)." Jamp Pharma Corporation
  2. (2023) "Product Information. Vesanoid (tretinoin)." Neon Healthcare Ltd
  3. fex g, larsson k, andersson a, Berggren-Soderlund M (1995) "Low serum concentration of all-trans and 13-cis retinoic acids in patients treated with phenytoin, carbamazepine and valproate. Possible relation to teratogenicity" Arch Toxicol, 69, p. 572-74
  4. nau h, tzimas g, mondry m, plum c, spohr hl (1995) "Antiepileptic drugs alter endogenous retinoid concentrations: a possible mechanism of teratogenesis of anticonvulsant therapy" Life Sci, 57, p. 53-60
  5. (2024) "Product Information. Vesanoid (tretinoin)." H2-Pharma LLC
  6. (2024) "Product Information. Vesanoid (tretinoin)." Pharmaco Australia Ltd
  7. (2022) "Product Information. Vesanoid (tretinoin)." Xediton Pharmaceuticals Inc
  8. (2023) "Product Information. VESANOID (tretinoína)." CHEPLAPHARM ARZNEIMITTEL GMBH

Drug and food interactions

Moderate

telotristat ethyl food

Applies to: telotristat

ADJUST DOSING INTERVAL: Food increases the systemic exposure to both telotristat ethyl and its active metabolite, telotristat. Following administration of a single 500 mg dose of telotristat ethyl (twice the recommended dose) with a high-fat meal, telotristat ethyl peak plasma concentration (Cmax) and systemic exposure (AUC) were 112% and 264% higher, respectively, compared to administration under fasted conditions. The Cmax and AUC values for telotristat were also increased by 47% and 33%, respectively. The in vitro inhibitory potency of telotristat towards tryptophan hydroxylase has been shown to be approximately 29 times higher than that of the parent drug.

MANAGEMENT: Telotristat ethyl should be administered with food.

References (1)
  1. (2017) "Product Information. Xermelo (telotristat ethyl)." Lexicon Pharmaceuticals, Inc.

Therapeutic duplication warnings

No warnings were found for your selected drugs.

Therapeutic duplication warnings are only returned when drugs within the same group exceed the recommended therapeutic duplication maximum.

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Drug Interaction Classification

These classifications are only a guideline. The relevance of a particular drug interaction to a specific individual is difficult to determine. Always consult your healthcare provider before starting or stopping any medication.
Major Highly clinically significant. Avoid combinations; the risk of the interaction outweighs the benefit.
Moderate Moderately clinically significant. Usually avoid combinations; use it only under special circumstances.
Minor Minimally clinically significant. Minimize risk; assess risk and consider an alternative drug, take steps to circumvent the interaction risk and/or institute a monitoring plan.
Unknown No interaction information available.

Further information

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