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Drug Interactions between ampicillin / probenecid and Famvir

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

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Interactions between your drugs

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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Minor

probenecid famciclovir

Applies to: ampicillin / probenecid and Famvir (famciclovir)

Probenecid may increase the serum concentrations of famciclovir and its active metabolite, penciclovir, through competitive inhibition of renal tubular secretion. Initial dosage adjustments are not usually necessary, but patients should be monitored for famciclovir-related toxicities. The clinical significance is unknown.

References

  1. Cerner Multum, Inc. "UK Summary of Product Characteristics." O 0

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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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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

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

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