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Drug Interactions between Harmonyl and MHP-A

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

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Interactions between your drugs

Moderate

methylene blue deserpidine

Applies to: MHP-A (hyoscyamine / methenamine / methylene blue / phenyl salicylate) and Harmonyl (deserpidine)

GENERALLY AVOID: The addition of a rauwolfia alkaloid to existing monoamine oxidase inhibitor (MAOI) therapy may result in profound excitation and/or a hypertensive reaction. The proposed mechanism is increased norepinephrine levels at adrenergic receptors due to both the inhibition of catecholamine metabolism by MAOIs and the release of catecholamines induced by rauwolfia alkaloids. Theoretically, this interaction should not occur if rauwolfia alkaloid therapy is initiated several days before the start of MAOI therapy. However, clinical data are limited.

MANAGEMENT: In general, rauwolfia alkaloids should not be administered to patients treated with MAOIs or other agents that possess MAOI activity (e.g., furazolidone, linezolid, methylene blue, procarbazine). At least 14 days should elapse between discontinuation of MAOI therapy and initiation of treatment with rauwolfia alkaloids.

References

  1. Pettinger WA, Soyangco FG, Oates JA "Inhibition of monoamine oxidase in man by furazolidone." Clin Pharmacol Ther 9 (1968): 442-7
  2. Schulz R, Antonin KH, Hoffmann E, et al. "Tyramine kinetics and pressor sensitivity during monoamine oxidase inhibition by selegiline." Clin Pharmacol Ther 46 (1989): 528-36
  3. Goldberg LI "Monoamine oxidase inhibitors: adverse reactions and possible mechanisms." JAMA 190 (1964): 456-62
  4. Sherman GP, Walton CA "Adrenergic transmission and drug interaction." J Am Pharm Assoc 15 (1975): 86-90
  5. De Vita VT, Hahn MA, Oliverio VT "Monoamine oxidase inhibition by a new carcinostatic agent, n-isopropyl-a-(2-methylhydrazino)-p-toluamide (MIH). (30590)." Proc Soc Exp Biol Med 120 (1965): 561-5
View all 5 references

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Drug and food interactions

Moderate

hyoscyamine food

Applies to: MHP-A (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 "Drug effects on psychomotor skills related to driving: interaction of atropine, glycopyrrhonium and alcohol." Eur J Clin Pharmacol 6 (1973): 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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