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Drug Interactions between Mintezol and Truphylline

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

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Interactions between your drugs

Moderate

thiabendazole aminophylline

Applies to: Mintezol (thiabendazole) and Truphylline (aminophylline)

MONITOR: Theophylline toxicity has been reported during concomitant administration of theophylline and thiabendazole. Decreases in clearance have been noted up to nine days after discontinuation of thiabendazole. One small study reported a decrease in clearance of 66%. The proposed mechanism is inhibition of hepatic metabolism by thiabendazole.

MANAGEMENT: Clinical monitoring of patient response and tolerance and serum theophylline levels is recommended. Patients should be advised to report any signs of theophylline toxicity including nausea, vomiting, diarrhea, headache, restlessness, insomnia, or irregular heartbeat to their physicians. The theophylline dosage may require reduction or alternatives agents could be considered during thiabenzole therapy.

References

  1. Lew G, Murray WE, Lane JR, Haeger E (1989) "Theophylline-thiabendazole drug interaction." Clin Pharm, 8, p. 225-7
  2. Schneider D, Gannon R, Sweeney K, Shore E (1990) "Theophylline and antiparasitic drug interactions: a case report and study of the influence of thiabendazole and mebendazole on theophylline pharmacokinetics in adult." Chest, 97, p. 84-7
  3. Upton RA (1991) "Pharmacokinetic interactions between theophylline and other medication (Part II)." Clin Pharmacokinet, 20, p. 135-50
  4. Sugar AM, Kearns PJ, Haulk AA, Rushing JL (1980) "Possible thiabendazole-induced theophylline toxicity." Am Rev Respir Dis, 122, p. 501-3
View all 4 references

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Drug and food interactions

Moderate

thiabendazole food

Applies to: Mintezol (thiabendazole)

MONITOR: Coadministration with thiabendazole may increase the plasma concentrations of caffeine. The mechanism is thiabendazole inhibition of the CYP450 1A2 metabolism of caffeine. In ten healthy, nonsmoking volunteers, administration of a single 136.5 mg dose of caffeine in combination with a single 500 mg dose of thiabendazole resulted in a nearly 60% increase in the area under the plasma concentration-time curve (AUC) of caffeine compared to administration without thiabendazole. In addition, the half-life of caffeine was increased from 11.9 to 28.6 hours, and oral clearance was reduced by 67% during coadministration with thiabendazole. The formation of paraxanthine from caffeine, which is primarily mediated by CYP450 1A2, was almost completely abolished until after the thiabendazole was cleared from the system.

MANAGEMENT: Patients should be advised that pharmacologic effects of caffeine may be increased during coadministration with thiabendazole.

References

  1. Bapiro TE, Sayi J, Hasler JA, et al. (2005) "Artemisinin and thiabendazole are potent inhibitors of cytochrome P450 1A2 (CYP1A2) activity in humans." Eur J Clin Pharmacol, 61, p. 755-61

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Moderate

aminophylline food

Applies to: Truphylline (aminophylline)

MONITOR: Coadministration of two or more sympathomimetic agents may increase the risk of adverse effects such as nervousness, irritability, and increased heart rate. Central nervous system (CNS) stimulants, particularly amphetamines, can potentiate the adrenergic response to vasopressors and other sympathomimetic agents. Additive increases in blood pressure and heart rate may occur due to enhanced peripheral sympathetic activity.

MANAGEMENT: Caution is advised if two or more sympathomimetic agents are coadministered. Pulse and blood pressure should be closely monitored.

References

  1. Rosenblatt JE, Lake CR, van Kammen DP, Ziegler MG, Bunney WE Jr (1979) "Interactions of amphetamine, pimozide, and lithium on plasma norepineophrine and dopamine-beta-hydroxylase in schizophrenic patients." Psychiatry Res, 1, p. 45-52
  2. Cavanaugh JH, Griffith JD, Oates JA (1970) "Effect of amphetamine on the pressor response to tyramine: formation of p-hydroxynorephedrine from amphetamine in man." Clin Pharmacol Ther, 11, p. 656
  3. (2001) "Product Information. Adderall (amphetamine-dextroamphetamine)." Shire Richwood Pharmaceutical Company Inc
  4. (2001) "Product Information. Tenuate (diethylpropion)." Aventis Pharmaceuticals
  5. (2001) "Product Information. Sanorex (mazindol)." Novartis Pharmaceuticals
  6. (2001) "Product Information. Focalin (dexmethylphenidate)." Mikart Inc
  7. (2002) "Product Information. Strattera (atomoxetine)." Lilly, Eli and Company
View all 7 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.

Further information

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