“…(); found ciprofloxacin at concentrations below the LLOQ (0.13 μg/ml) after oral enrofloxacin administration. Low conversion of enrofloxacin to ciprofloxacin has been reported in chickens (Knoll, Glunder, & Kietzmann, ), foals (Bermingham, Papich, & Vivrette, ), and pigs (Nielsen & Gyrd‐Hansen, ) and may be due to reduced biotransformation of enrofloxacin to ciprofloxacin or rapid elimination of ciprofloxacin. Although fluoroquinolones are categorized as CYP1A2 inhibitors in people and dogs (Fish, ; Regmi, Abd El‐Aty, Kuroha, Nakamura, & Shimoda, ), the biotransformation pathway that converts enrofloxacin to ciprofloxacin in other species has not been reported. - Enrofloxacin and marbofloxacin binding to plasma proteins: Medicines circulate with a proportion bound to plasma proteins, with the unbound proportion therapeutically active (Lindup & Orme, ).
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