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Drug Interactions between Emflaza and MSP-Blu

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

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Interactions between your drugs

Moderate

phenyl salicylate deflazacort

Applies to: MSP-Blu (hyoscyamine / methenamine / methylene blue / phenyl salicylate) and Emflaza (deflazacort)

MONITOR: Coadministration with corticosteroids may decrease the serum concentrations and therapeutic effects of salicylates. Likewise, serum salicylate levels may increase following withdrawal of corticosteroid therapy, potentially resulting in salicylate toxicity. This interaction has been reported in patients receiving intra-articular as well as oral corticosteroids. One or more mechanisms may be involved, including an increase in the renal clearance and/or an induction of hepatic metabolism of salicylates caused by corticosteroids. Pharmacologically, the potential for increased gastrointestinal (GI) toxicity, including inflammation, bleeding, ulceration and perforation, should be considered due to additive ulcerogenic effects of these agents (especially aspirin) on the GI mucosa.

MANAGEMENT: Patients treated concomitantly with a corticosteroid may require higher dosages of salicylates or salicylate-like drugs. Pharmacologic response to these agents should be monitored more closely whenever a corticosteroid is added to or withdrawn from therapy in patients stabilized on their existing salicylate regimen, and the salicylate dosage adjusted as necessary. During concomitant therapy, patients should be advised to take the medications with food and to immediately report signs and symptoms of GI ulceration and bleeding such as severe abdominal pain, dizziness, lightheadedness, and the appearance of black, tarry stools. The selective use of prophylactic anti-ulcer therapy (e.g., antacids, H2-antagonists) may be appropriate, particularly in patients with a prior history of peptic ulcer disease or GI bleeding and in elderly and debilitated patients.

References

  1. Baer PA, Shore A, Ikeman RL (1987) "Transient fall in serum salicylate levels following intraarticular injection of steroid in patients with rheumatoid arthritis." Arthritis Rheum, 30, p. 345-7
  2. Koren G, Roifman C, Gelfand E, Lavi S, Suria D, Stein L (1987) "Corticosteroids-salicylate interaction in a case of juvenile rheumatoid arthritis." Ther Drug Monit, 9, p. 177-9
  3. Edelman J, Potter JM, Hackett LP (1986) "The effect of intra-articular steroids on plasma salicylate concentrations." Br J Clin Pharmacol, 21, p. 301-7
  4. Piper JM, Ray WA, Daugherty JR, Griffin MR (1991) "Corticosteroid use and peptic ulcer disease: role of nonsteroidal ani-inflammatory drugs." Ann Intern Med, 114, p. 735-40
  5. Hansen RA, Tu W, Wang J, Ambuehl R, McDonald CJ, Murray MD (2008) "Risk of adverse gastrointestinal events from inhaled corticosteroids." Pharmacotherapy, 28, p. 1325-34
View all 5 references

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Drug and food interactions

Moderate

deflazacort food

Applies to: Emflaza (deflazacort)

GENERALLY AVOID: Grapefruit juice may increase the plasma concentrations of 21-desdeflazacort, the active metabolite of deflazacort that is formed by esterases after oral administration and further metabolized by CYP450 3A4 to several inactive metabolites. The proposed mechanism is inhibition of CYP450 3A4-mediated metabolism in the gut wall by certain compounds present in grapefruit. In general, the effect of grapefruit juice is concentration-, dose- and preparation-dependent, and can vary widely among brands. Certain preparations of grapefruit juice (e.g., high dose, double strength) have sometimes demonstrated potent inhibition of CYP450 3A4, while other preparations (e.g., low dose, single strength) have typically demonstrated moderate inhibition. Increased systemic exposure to 21-desdeflazacort may increase the risk of corticosteroid adverse effects such as hypercorticism, hyperglycemia, adrenal suppression, immunosuppression, hypertension, salt and water retention, electrolyte abnormalities, behavioral and mood disturbances, posterior subcapsular cataracts, glaucoma, bone loss, and growth retardation in children and adolescents.

MANAGEMENT: Deflazacort should not be administered with grapefruit juice.

References

  1. Cerner Multum, Inc. "UK Summary of Product Characteristics."

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Moderate

hyoscyamine food

Applies to: MSP-Blu (hyoscyamine / methenamine / methylene blue / phenyl salicylate)

GENERALLY AVOID: Use of anticholinergic agents with alcohol may result in sufficient impairment of attention so as to render driving and operating machinery more hazardous. In addition, the potential for abuse may be increased with the combination. The mechanism of interaction is not established but may involve additive depressant effects on the central nervous system. No effect of oral propantheline or atropine on blood alcohol levels was observed in healthy volunteers when administered before ingestion of a standard ethanol load. However, one study found impairment of attention in subjects given atropine 0.5 mg or glycopyrrolate 1 mg in combination with alcohol.

MANAGEMENT: Alcohol should generally be avoided during therapy with anticholinergic agents. Patients should be counseled to avoid activities requiring mental alertness until they know how these agents affect them.

References

  1. Linnoila M (1973) "Drug effects on psychomotor skills related to driving: interaction of atropine, glycopyrrhonium and alcohol." Eur J Clin Pharmacol, 6, p. 107-12

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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.

See also

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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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