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Drug Interactions between itraconazole and lansoprazole / naproxen

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

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Interactions between your drugs

Moderate

naproxen lansoprazole

Applies to: lansoprazole / naproxen and lansoprazole / naproxen

GENERALLY AVOID: Theoretically, proton pump inhibitors may decrease the gastrointestinal absorption of enteric-coated naproxen, which requires an acidic environment for dissolution. The proposed mechanism is an increase in gastric pH (i.e. decreased gastric acidity) induced by proton pump inhibitors. In patients treated with proton pump inhibitors, the possibility of a reduced or subtherapeutic response to enteric-coated naproxen should be considered.

MANAGEMENT: Concomitant use of these drugs is generally not recommended.

References (1)
  1. (2002) "Product Information. Naprosyn (naproxen)." Syntex Laboratories Inc
Moderate

itraconazole lansoprazole

Applies to: itraconazole and lansoprazole / naproxen

GENERALLY AVOID: Proton pump inhibitors may decrease the gastrointestinal absorption of the azole antifungal agents, itraconazole and ketoconazole, both of which require an acidic environment for dissolution. By increasing gastric pH and reducing the acidity, proton pump inhibitors can decrease bioavailability of the azoles by 75% to 80%.

MANAGEMENT: If coadministration is necessary, an acidic pH may be produced with two capsules of glutamic acid hydrochloride administered 15 minutes before the azole dose. Administration with an acidic beverage such as Coca-Cola(R) or Pepsi(R) may also help. However, clinicians should still consider the possibility of a reduced or subtherapeutic antifungal effect. It may be appropriate to switch to an agent like fluconazole or terbinafine whose absorption is not affected by stomach pH.

References (12)
  1. Piscitelli SC, Goss TF, Wilton JH, D'Andrea DT, Goldstein H, Schentag JJ (1991) "Effects of ranitidine and sucralfate on ketoconazole bioavailability." Antimicrob Agents Chemother, 35, p. 1765-71
  2. Van der Meer JW, Keuning JJ (1980) "The influence of gastric acidity on the bio-availability of ketoconazole." J Antimicrob Chemother, 6, p. 552-4
  3. Carlson JA, Mann HJ, Canafax DM (1983) "Effect of pH on disintegration and dissolution of ketoconazole tablets." Am J Hosp Pharm, 40, p. 1334-6
  4. (2022) "Product Information. PriLOSEC (omeprazole)." Merck & Co., Inc
  5. (2001) "Product Information. Prevacid (lansoprazole)." TAP Pharmaceuticals Inc
  6. Chin TWF, Loeb M, Fong IW (1995) "Effects of an acidic beverage (coca-cola) on absorption of ketoconazole." Antimicrob Agents Chemother, 39, p. 1671-5
  7. Jaruratanasirikul S, Sriwiriyajan S (1998) "Effect of omeprazole on the pharmacokinetics of itraconazole." Eur J Clin Pharmacol, 54, p. 159-61
  8. Bottiger Y, Tybring G, Gotharson E, Bertilsson L (1997) "Inhibition of the sulfoxidation of omeprazole by ketoconazole in poor and extensive metabolizers of S-mephenytoin." Clin Pharmacol Ther, 62, p. 384-91
  9. (2001) "Product Information. Aciphex (rabeprazole)." Janssen Pharmaceuticals
  10. (2001) "Product Information. Protonix (pantoprazole)." Wyeth-Ayerst Laboratories
  11. (2001) "Product Information. Nexium (esomeprazole)." Astra-Zeneca Pharmaceuticals
  12. (2009) "Product Information. Kapidex (dexlansoprazole)." Takeda Pharmaceuticals America

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

naproxen food

Applies to: lansoprazole / naproxen

GENERALLY AVOID: The concurrent use of aspirin or nonsteroidal anti-inflammatory drugs (NSAIDs) and ethanol may lead to gastrointestinal (GI) blood loss. The mechanism may be due to a combined local effect as well as inhibition of prostaglandins leading to decreased integrity of the GI lining.

MANAGEMENT: Patients should be counseled on this potential interaction and advised to refrain from alcohol consumption while taking aspirin or NSAIDs.

References (1)
  1. (2002) "Product Information. Motrin (ibuprofen)." Pharmacia and Upjohn
Moderate

naproxen food

Applies to: lansoprazole / naproxen

MONITOR: Smoking cessation may lead to elevated plasma concentrations and enhanced pharmacologic effects of drugs that are substrates of CYP450 1A2 (and possibly CYP450 1A1) and/or certain drugs with a narrow therapeutic index (e.g., flecainide, pentazocine). One proposed mechanism is related to the loss of CYP450 1A2 and 1A1 induction by polycyclic aromatic hydrocarbons in tobacco smoke; when smoking cessation agents are initiated and smoking stops, the metabolism of certain drugs may decrease leading to increased plasma concentrations. The mechanism by which smoking cessation affects narrow therapeutic index drugs that are not known substrates of CYP450 1A2 or 1A1 is unknown. The clinical significance of this interaction is unknown as clinical data are lacking.

MANAGEMENT: Until more information is available, caution is advisable if smoking cessation agents are used concomitantly with drugs that are substrates of CYP450 1A2 or 1A1 and/or those with a narrow therapeutic range. Patients receiving smoking cessation agents may require periodic dose adjustments and closer clinical and laboratory monitoring of medications that are substrates of CYP450 1A2 or 1A1.

References (4)
  1. (2024) "Product Information. Cytisine (cytisinicline)." Consilient Health Ltd
  2. jeong sh, Newcombe D, sheridan j, Tingle M (2015) "Pharmacokinetics of cytisine, an a4 b2 nicotinic receptor partial agonist, in healthy smokers following a single dose." Drug Test Anal, 7, p. 475-82
  3. Vaughan DP, Beckett AH, Robbie DS (1976) "The influence of smoking on the intersubject variation in pentazocine elimination." Br J Clin Pharmacol, 3, p. 279-83
  4. Zevin S, Benowitz NL (1999) "Drug interactions with tobacco smoking: an update" Clin Pharmacokinet, 36, p. 425-38

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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