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Drug Interactions between ampicillin / probenecid and Uritact DS

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

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Interactions between your drugs

Moderate

probenecid phenyl salicylate

Applies to: ampicillin / probenecid and Uritact DS (hyoscyamine / methenamine / methylene blue / phenyl salicylate)

GENERALLY AVOID: Large, anti-inflammatory doses of salicylates may inhibit the uricosuric effect of probenecid. The mechanism of interaction has not been established. In contrast, low, daily antiplatelet doses do not seem to interact. In a study of 11 patients with gouty arthritis receiving a stable dosage of probenecid for at least three months, no significant effects on serum levels or 24-hour urinary excretion of uric acid were observed during coadministration with enteric-coated aspirin 325 mg/day, taken simultaneously with probenecid or 6 hours after.

MANAGEMENT: Large doses of salicylates should be avoided in patients who require probenecid for the treatment of hyperuricemia or gout. However, occasional use of low dosages for analgesia or daily use of cardioprotective dosages should generally not be a concern.

References

  1. Diamond JS, Paolino JS "Evidence for a postsecretory reabsorptive site for uric acid in man." J Clin Invest 52 (1973): 1491-9
  2. Regal RE "Aspirin and uricosurics: interaction revisited." Drug Intell Clin Pharm 21 (1987): 219-20
  3. Harris M, Bryant LR, Danaher P, Alloway J "Effect of low dose daily aspirin on serum urate levels and urinary excretion in patients receiving probenecid for gouty arthritis." J Rheumatol 27 (2000): 2873-6
  4. Cerner Multum, Inc. "UK Summary of Product Characteristics." O 0
View all 4 references

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Minor

ampicillin probenecid

Applies to: ampicillin / probenecid and ampicillin / probenecid

Probenecid may increase the plasma concentrations and half-lives of penicillins. The mechanism is competitive inhibition by probenecid of the renal tubular secretion of penicillins. While this interaction is often exploited to enhance the antibacterial effect of penicillins, toxicity may occur and should be considered if high penicillin dosages are administered intravenously.

References

  1. Sommers DK, Schoeman HS "Drug interactions with urate excretion in man?" Eur J Clin Pharmacol 32 (1987): 499-502
  2. Waller ES, Sharanevych MA, Yakatan GJ "The effect of probenecid on nafcillin disposition." J Clin Pharmacol 22 (1982): 482-9
  3. Shanson DC, McNabb R, Hajipieris P "The effect of probenecid on serum amoxycillin concentrations up to 18 hours after a single 3g oral dose of amoxycillin: possible implications for preventing endocarditis." J Antimicrob Chemother 13 (1984): 629-32
  4. Sutherland R, Croydon EA, Rolinson GN "Amoxycillin: a new semi-synthetic penicillin." Br Med J 3 (1972): 13-6
  5. Allen MB, Fitzpatrick RW, Barratt A, Cole RB "The use of probenecid to increase the serum amoxycillin levels in patients with bronchiectasis." Respir Med 84 (1990): 143-6
  6. Gibaldi M, Schwartz MA "Apparent effect of probenecid on the distribution of penicillins in man." Clin Pharmacol Ther 9 (1968): 345-9
View all 6 references

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Drug and food interactions

Moderate

ampicillin food

Applies to: ampicillin / probenecid

ADJUST DOSING INTERVAL: Certain penicillins may exhibit reduced gastrointestinal absorption in the presence of food. The therapeutic effect of the antimicrobial may be reduced.

MANAGEMENT: The interacting penicillin should be administered one hour before or two hours after meals. Penicillin V and amoxicillin are not affected by food and may be given without regard to meals.

References

  1. Neu HC "Antimicrobial activity and human pharmacology of amoxicillin." J Infect Dis 129 (1974): s123-31
  2. Welling PG, Huang H, Koch PA, Madsen PO "Bioavailability of ampicillin and amoxicillin in fasted and nonfasted subjects." J Pharm Sci 66 (1977): 549-52
  3. McCarthy CG, Finland M "Absorption and excretion of four penicillins." N Engl J Med 263 (1960): 315-26
  4. Cronk GA, Wheatley WB, Fellers GF, Albright H "The relationship of food intake to the absorption of potassium alpha-phenoxyethyl penicillin and potassium phenoxymethyl penicillin from the gastrointestinal tract." Am J Med Sci 240 (1960): 219-25
  5. Klein JO, Sabath LD, Finland M "Laboratory studies on oxacillin. I: in vitro activity against staphylococci and some other bacterial pathogens. II: absorption and urinary excretion in normal young." Am J Med Sci 245 (1963): 399-411
  6. Neuvonen PJ, Elonen E, Pentikainen PJ "Comparative effect of food on absorption of ampicillin and pivampicillin." J Int Med Res 5 (1977): 71-6
View all 6 references

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Moderate

hyoscyamine food

Applies to: Uritact DS (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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