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New ciprofloxacin (CFX) derivatives show improved pharmacokinetics compared to the parent drug. These potent antibiotics offer promising alternatives for combating resistant microbes.

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Area of Science:

  • Pharmacology
  • Medicinal Chemistry
  • Microbiology

Background:

  • Ciprofloxacin (CFX) is a second-generation fluoroquinolone antibiotic.
  • Development of novel CFX derivatives targets resistant microbes via modifications at C3 and C7 positions.
  • Three out of seven synthesized CFX derivatives demonstrated potent activity against resistant microorganisms.

Purpose of the Study:

  • To evaluate and compare the pharmacokinetic parameters of ciprofloxacin (CFX) and its novel derivatives.
  • To assess the absorption, distribution, metabolism, and excretion (ADME) profile of CFX analogues in an animal model.
  • To determine if CFX derivatives exhibit enhanced pharmacokinetic properties over the parent compound.

Main Methods:

  • Seven ciprofloxacin derivatives were synthesized, with three showing potent antimicrobial activity.
  • A preclinical pharmacokinetic study was conducted on fifteen rabbits.
  • Animals received a single oral dose of 40mg/kg of CFX or its analogues after a 12-hour fast.
  • Blood samples were collected over 24 hours post-administration.
  • Pharmacokinetic parameters were analyzed using a validated high-performance liquid chromatography (HPLC) method.

Main Results:

  • CFX and its analogues were rapidly absorbed and distributed, with moderate elimination from the animal body.
  • The volume of distribution (Vdss) ranged from 263.51 to 1068.89 (mg)/(μg/ml).
  • Total body clearance (CL) varied between 42.35 and 200.16 mg/(μg/ml)/h.
  • Peak plasma concentration (Cmax) of 1.04-5.66 μg/mL was achieved at a time to maximum concentration (Tmax) of 0.5 hours.
  • Elimination half-life (T1/2) ranged from 4.055 to 10.14 hours.

Conclusions:

  • The synthesized ciprofloxacin analogues exhibit favorable pharmacokinetic profiles.
  • All evaluated CFX analogues demonstrated superior pharmacokinetic properties compared to the parent ciprofloxacin after oral administration.
  • These findings suggest that CFX derivatives hold potential as improved therapeutic agents against resistant microbial infections.