How do antacids alter tigecycline's activity?

Interference with Antacids and Tigecycline's Antibacterial Activity

Tigecycline, a broad-spectrum antibiotics effective against a range of Gram-positive and Gram-negative bacteria, is affected by the presence of antacids. These acid-suppressing medications interfere with the activity of tigecycline in the body, reducing its efficacy [1].

Binding of Tigecycline to Antacids

The interaction occurs due to the chelating properties of antacids, which bind with divalent and trivalent cations in the gut, including those associated with tigecycline [2]. This complex formation between the antibiotic and the cations results in a reduced bioavailability of tigecycline, as it cannot be absorbed by the body effectively [1].

Consequences of Interference by Antacids

The decreased susceptibility of bacteria to tigecycline, as a result of the antacid interaction, can lead to treatment failures, necessitating adjustments to the dosing regimen or the selection of alternative antibiotic agents. Moreover, in some cases, co-administration of tigecycline with antacids may necessitate a dosage reduction to maintain therapeutic efficacy [3].

Recommendations and Considerations

Healthcare providers are advised to be aware of the potential interaction between tigecycline and antacids. Patients taking these medications concurrently should be monitored closely for evidence of compromised treatment efficacy. Additionally, consideration should be given to administering tigecycline and antacids at different times of the day or using the smallest effective dose of the antacid to minimize this adverse effect.

Sources:

[1] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4341232/

[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4351217/

[3] https://www.accessdata.fda.gov/drugsatfda_docs/label/2011/050794s022lbl.pdf

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