The biopharmaceutical study of doxycycline interaction with mineral waters and soft drinks in vitro
Keywords:doxycycline capsules, dissolution test, metal cations, complexes, interaction with mineral water
When taking the antibiotics of the tetracycline group together with food and drinks the components may decrease bioavailability, the effectiveness of the drug and change the kinetics of its release. A bright example is the interaction of doxycycline with antacid drugs, food products such as milk, cheese and others, containing alkaline earth metal cations. However, the experimental data on the possible interaction of doxycycline with mineral water and soft drinks are absent.
Aim. To study the possible interaction of doxycycline with salts of alkaline earth metals and its effect on bioavailability in the experiment in vitro.
Materials and methods. The study objects were doxycycline hyclate capsules, mineral waters and soft drinks. During the study a Mettler Toledo AB-204 / A analytical balance was used. The test “Dissolution” for solid dosage forms was performed on a PharmaTest-DT70 device (Germany). The quantitative content of the active substance was determined on a “Specord 200” spectrophotometer (Germany).
Results. There was an increase in the concentration of doxycycline in the medium of 0.1 M HCl solution when adding such mineral waters as “Karpatska Dzherelna”, “Truskavetska”, “Essentuki No. 17”, “Polyana kvasova”. With addition of “Sprite” soft drink a decrease in the concentration compared to the control sample was observed. The dissolution profile of doxycycline capsules in the medium of 0.1 M HCl with addition of “Truskavetska” mineral water is not comparable to the control sample. The dissolution profiles of other mineral waters studied and “Sprite” are similar.
Conclusions. The assumption can be made about the possible interaction of calcium and magnesium cations in waters mentioned above with the doxycycline hyclate molecule. In practical terms, this means unacceptability of simultaneous intake the mineral waters studied with doxycycline hyclate capsules.
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