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Stability and antibacterial potency of ceftazidime and vancomycin eyedrops reconstituted in BSS against Pseudomonas aeruginosa and Staphylococcus aureus.
Acta Ophthalmol. 2009 Aug; 87(5):555-8.AO

Abstract

PURPOSE

We aimed to study the stability and the in vitro antibacterial potency of ceftazidime and vancomycin eyedrops against Pseudomonas aeruginosa and Staphylococcus aureus, respectively, under different storage temperatures and light conditions.

METHODS

Solutions of ceftazidime 50 mg/ml and vancomycin 50 mg/ml were prepared by reconstituting with balanced salt solution (BSS) and stored at 4 degrees C and at 24 degrees C with and without exposure to light. The minimum bactericidal concentrations against P. aeruginosa and S. aureus were measured to evaluate the antimicrobial potency over a 4-week period. Changes in the pH values and physical characteristics of the solutions were recorded over the same period of time.

RESULTS

The antibacterial potency of ceftazidime decreased significantly from days 3 and 7 onwards at storage temperatures of 24 degrees C and 4 degrees C, respectively, but was not affected by light exposure. The pH value progressed from acidic to alkaline, peaking at day 3, in all solutions. The antibacterial potency of vancomycin remained stable during the 4-week period, but its pH showed a slight progression from acidic to less acidic, in all solutions.

CONCLUSIONS

Ceftazidime eyedrops in BSS appear to remain effective against P. aeruginosa for > or = 7 days when stored at 4 degrees C, but were less effective when stored at 24 degrees C. Loss of antibacterial potency coincides with the appearance of visual and olfactory signs of degradation. The transient rise in pH at day 3 is a matter of possible concern, however, as it may affect patient tolerance. By contrast, vancomycin eyedrops in BSS can be safely used for > or = 4 weeks, stored at either 4 degrees C or 24 degrees C.

Authors+Show Affiliations

Aristotle University of Thessaloniki, Greece. karophth@auth.grNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

18700884

Citation

Karampatakis, Vasileios, et al. "Stability and Antibacterial Potency of Ceftazidime and Vancomycin Eyedrops Reconstituted in BSS Against Pseudomonas Aeruginosa and Staphylococcus Aureus." Acta Ophthalmologica, vol. 87, no. 5, 2009, pp. 555-8.
Karampatakis V, Papanikolaou T, Giannousis M, et al. Stability and antibacterial potency of ceftazidime and vancomycin eyedrops reconstituted in BSS against Pseudomonas aeruginosa and Staphylococcus aureus. Acta Ophthalmol. 2009;87(5):555-8.
Karampatakis, V., Papanikolaou, T., Giannousis, M., Goulas, A., Mandraveli, K., Kilmpasani, M., Alexiou-Daniel, S., & Mirtsou-Fidani, V. (2009). Stability and antibacterial potency of ceftazidime and vancomycin eyedrops reconstituted in BSS against Pseudomonas aeruginosa and Staphylococcus aureus. Acta Ophthalmologica, 87(5), 555-8. https://doi.org/10.1111/j.1755-3768.2008.01306.x
Karampatakis V, et al. Stability and Antibacterial Potency of Ceftazidime and Vancomycin Eyedrops Reconstituted in BSS Against Pseudomonas Aeruginosa and Staphylococcus Aureus. Acta Ophthalmol. 2009;87(5):555-8. PubMed PMID: 18700884.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Stability and antibacterial potency of ceftazidime and vancomycin eyedrops reconstituted in BSS against Pseudomonas aeruginosa and Staphylococcus aureus. AU - Karampatakis,Vasileios, AU - Papanikolaou,Theoharis, AU - Giannousis,Michael, AU - Goulas,Antonis, AU - Mandraveli,Kaliopi, AU - Kilmpasani,Maria, AU - Alexiou-Daniel,Stella, AU - Mirtsou-Fidani,Vassiliki, Y1 - 2008/08/12/ PY - 2008/8/15/pubmed PY - 2009/11/7/medline PY - 2008/8/15/entrez SP - 555 EP - 8 JF - Acta ophthalmologica JO - Acta Ophthalmol VL - 87 IS - 5 N2 - PURPOSE: We aimed to study the stability and the in vitro antibacterial potency of ceftazidime and vancomycin eyedrops against Pseudomonas aeruginosa and Staphylococcus aureus, respectively, under different storage temperatures and light conditions. METHODS: Solutions of ceftazidime 50 mg/ml and vancomycin 50 mg/ml were prepared by reconstituting with balanced salt solution (BSS) and stored at 4 degrees C and at 24 degrees C with and without exposure to light. The minimum bactericidal concentrations against P. aeruginosa and S. aureus were measured to evaluate the antimicrobial potency over a 4-week period. Changes in the pH values and physical characteristics of the solutions were recorded over the same period of time. RESULTS: The antibacterial potency of ceftazidime decreased significantly from days 3 and 7 onwards at storage temperatures of 24 degrees C and 4 degrees C, respectively, but was not affected by light exposure. The pH value progressed from acidic to alkaline, peaking at day 3, in all solutions. The antibacterial potency of vancomycin remained stable during the 4-week period, but its pH showed a slight progression from acidic to less acidic, in all solutions. CONCLUSIONS: Ceftazidime eyedrops in BSS appear to remain effective against P. aeruginosa for > or = 7 days when stored at 4 degrees C, but were less effective when stored at 24 degrees C. Loss of antibacterial potency coincides with the appearance of visual and olfactory signs of degradation. The transient rise in pH at day 3 is a matter of possible concern, however, as it may affect patient tolerance. By contrast, vancomycin eyedrops in BSS can be safely used for > or = 4 weeks, stored at either 4 degrees C or 24 degrees C. SN - 1755-3768 UR - https://www.unboundmedicine.com/medline/citation/18700884/Stability_and_antibacterial_potency_of_ceftazidime_and_vancomycin_eyedrops_reconstituted_in_BSS_against_Pseudomonas_aeruginosa_and_Staphylococcus_aureus_ L2 - https://doi.org/10.1111/j.1755-3768.2008.01306.x DB - PRIME DP - Unbound Medicine ER -