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Drug Interactions between itraconazole and Triam-Forte

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

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Major

itraconazole triamcinolone

Applies to: itraconazole and Triam-Forte (triamcinolone)

MONITOR CLOSELY: Coadministration with potent inhibitors of CYP450 3A4 may significantly increase the plasma concentrations of triamcinolone. No pharmacokinetic data are available. However, there have been numerous published case reports of Cushing's syndrome and adrenal suppression associated with concomitant use of triamcinolone with various ritonavir-containing antiretroviral regimens and one case report with nefazodone.

MANAGEMENT: The possibility of increased corticosteroid effects should be considered when triamcinolone is used with potent CYP450 3A4 inhibitors. Some authorities advise against concomitant use unless the potential benefit outweighs the risk. If coadministration is necessary, a lower dosage of triamcinolone may be appropriate. Patients should be monitored for signs and symptoms of hypercorticism such as acne, striae, thinning of the skin, easy bruising, moon facies, dorsocervical "buffalo" hump, truncal obesity, increased appetite, acute weight gain, edema, hypertension, hirsutism, hyperhidrosis, proximal muscle wasting and weakness, glucose intolerance, exacerbation of preexisting diabetes, depression, and menstrual disorders. Other systemic glucocorticoid effects may include adrenal suppression, immunosuppression, posterior subcapsular cataracts, glaucoma, bone loss, and growth retardation in children and adolescents. Following extensive use with a potent CYP450 3A4 inhibitor, a progressive dosage reduction may be required over a longer period if triamcinolone is to be withdrawn from therapy, as there may be a significant risk of adrenal suppression. Signs and symptoms of adrenal insufficiency include anorexia, hypoglycemia, nausea, vomiting, weight loss, muscle wasting, fatigue, weakness, dizziness, postural hypotension, depression, and adrenal crisis manifested as inability to respond to stress (e.g., illness, infection, surgery, trauma).

References

  1. EMEA. European Medicines Agency "EPARs. European Union Public Assessment Reports. http://www.ema.europa.eu/ema/index.jsp?curl=pages/includes/medicines/medicines_landingpage.jsp&mid" (2007):
  2. Agencia Española de Medicamentos y Productos Sanitarios Healthcare "Centro de información online de medicamentos de la AEMPS - CIMA. https://cima.aemps.es/cima/publico/home.html" (2008):
  3. Hagan JB, Erickson D, Singh RJ "Triamcinolone Acetonide Induced Secondary Adrenal Insufficiency Related to Impaired CYP3A4 Metabolism by Coadministration of Nefazodone." Pain Med (2010):
  4. Dort K, Padia S, Wispelwey B, Moore CC "Adrenal suppression due to an interaction between ritonavir and injected triamcinolone: a case report." AIDS Res Ther 6 (2009): 10
  5. Levine D, Ananthakrishnan S, Garg A "Iatrogenic Cushing syndrome after a single intramuscular corticosteroid injection and concomitant protease inhibitor therapy." J Am Acad Dermatol 65 (2011): 877-8
  6. Grierson MJ, Harrast MA "Iatrogenic Cushing Syndrome After Epidural Steroid Injections for Lumbar Radiculopathy in an HIV-Infected Patient Treated With Ritonavir: A Case Report Highlighting Drug Interactions for Spine Interventionalists." PM R 4 (2012): 234-7
  7. Albert NE, Kazi S, Santoro J, Dougherty R "Ritonavir and Epidural Triamcinolone as a Cause of Iatrogenic Cushing's Syndrome." Am J Med Sci (2012):
  8. Fessler D, Beach J, Keel J, Stead W "Iatrogenic hypercortisolism complicating triamcinolone acetonide injections in patients with HIV on ritonavir-boosted protease inhibitors." Pain Physician 15 (2012): 489-93
  9. Schwarze-Zander C, Klingmuller D, Klumper J, Strassburg CP, Rockstroh JK "Triamcinolone and ritonavir leading to drug-induced Cushing syndrome and adrenal suppression: description of a new case and review of the literature." Infection (2013):
  10. Hall JJ, Hughes CA, Foisy MM, Houston S, Shafran S "Iatrogenic Cushing syndrome after intra-articular triamcinolone in a patient receiving ritonavir boosted darunavir." Int J STD AIDS (2013):
  11. McConkey HZ, Williams H, Kulasegaram R, Graham E "Orbital floor triamcinolone causing Cushing's syndrome in a patient treated with Kaletra for HIV 1." BMJ Case Rep 2013 (2013):
  12. Sadarangani S, Berg ML, Mauck W, Rizza S "Iatrogenic Cushing Syndrome Secondary to Ritonavir-Epidural Triamcinolone Interaction: An Illustrative Case and Review." Interdiscip Perspect Infect Dis 2014 (2014): 849432
View all 12 references

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Drug and food interactions

Moderate

itraconazole food

Applies to: itraconazole

ADJUST DOSING INTERVAL: Food increases the absorption of itraconazole capsules but decreases the absorption of itraconazole oral solution. Cola beverages may increase the bioavailability of itraconazole capsules. Itraconazole capsules require an acidic gastric pH for adequate dissolution and subsequent absorption. Cola beverages help lower gastric pH and improve absorption.

GENERALLY AVOID: Grapefruit juice may impair the absorption of itraconazole capsules, resulting in decreased antifungal effects. In a small, randomized, crossover study, the administration of itraconazole capsules with double-strength grapefruit juice (compared to water) was associated with significantly decreased (43%) plasma concentrations of itraconazole and its pharmacologically active hydroxy metabolite, as well as delayed times to reach peak concentrations of both. The exact mechanism of interaction is unknown but may involve reduced absorption of itraconazole secondary to enhanced activity of intestinal P-glycoprotein drug efflux pumps and delayed gastric emptying induced by certain compounds present in grapefruits. Another study reported no pharmacokinetic changes with single-strength grapefruit juice. Whether or not these observations apply to itraconazole oral solution is unknown.

MANAGEMENT: The manufacturer recommends that the capsules be taken immediately after a full meal and the solution be taken on an empty stomach to ensure maximal absorption. Cola beverages may help increase the bioavailability of itraconazole capsules, particularly in patients with hypochlorhydria or those treated concomitantly with gastric acid suppressants. Until more information is available, it may be advisable to avoid the consumption of grapefruits and grapefruit juice during itraconazole therapy.

References

  1. Van Peer A, Woestenborghs R, Heykants J, et al. "The effects of food and dose on the oral systemic availability of itraconazole in healthy subjects." Eur J Clin Pharmacol 36 (1989): 423-6
  2. Wishart JM "The influence of food on the pharmacokinetics of itraconazole in patients with superficial fungal infection." J Am Acad Dermatol 17 (1987): 220-3
  3. "Product Information. Sporanox (itraconazole)." Janssen Pharmaceuticals PROD (2002):
  4. Barone JA, Koh JG, Bierman RH, Colaizzi JL, Swanson KA, Gaffar MC, Moskovitz BL, Mechlinski W, Van de Velde V "Food interaction and steady-state pharmacokinetics of itraconazole capsules in healthy male volunteers." Antimicrob Agents Chemother 37 (1993): 778-84
  5. Zimmermann T, Yeates RA, Albrecht M, Laufen H, Wildfeuer A "Influence of concomitant food intake on the gastrointestinal absorption of fluconazole and itraconazole in japanese subjects." Int J Clin Pharmacol Res 14 (1994): 87-93
  6. "Product Information. Sporanox (itraconazole)." Janssen Pharmaceuticals (2022):
  7. Kawakami M, Suzuki K, Ishizuka T, Hidaka T, Matsuki Y, Nakamura H "Effect of grapefruit juice on pharmacokinetics of itraconazole in healthy subjects." Int J Clin Pharmacol Ther 36 (1998): 306-8
  8. Barone JA, Moskotitz BL, Guarnieri J, Hassell AE, Colaizzi JL, Bierman RH, Jessen L "Food interaction and steady-state pharmacokinetics of itraconazole oral solution in healthy volunteers." Pharmacotherapy 18 (1998): 295-301
  9. Penzak SR, Gubbins PO, Gurley BJ, Wang PL, Saccente M "Grapefruit juice decreases the systemic availability of itraconazole capsules in healthy volunteers." Ther Drug Monit 21 (1999): 304-9
  10. Katz HI "Drug interactions of the newer oral antifungal agents." Br J Dermatol 141 (1999): 26-32
View all 10 references

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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.

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