The efficacy and tolerability of a marbofloxacin-clotrimazole-dexamethasone otic suspension (MCD) was compared with a standard topical treatment using a phase III clinical trial protocol. In a total of 140 dogs with clinical signs of acute or subacute otitis externa, Staphylococcus, Pseudomonas, Enterobacteriaceae and Malassezia were isolated from samples taken at inclusion to identify the causative pathogen; a further sample was collected in the event of failure or relapse, and from dogs (at day 14) for which Pseudomonas species had been isolated at inclusion. One group received MCD (10 drops per affected ear) once daily and a second received Surolan (containing polymyxin B, miconazole and prednisolone) (5 drops per affected ear), twice daily. Each group received treatment for 7 or 14 days according to the clinical outcome on day 7. Efficacy and tolerability were evaluated on days 7, 14 and, if necessary, 28 for dogs treated for 14 days. The trial demonstrated equivalence of both treatments in terms of efficacy, with a cure rate of 58.3% for MCD and 41.2% for Surolan. Both medications were equally well tolerated by dogs, but MCD was superior in terms of pain relief, decrease in pus quantity and smell, response rate and investigator's assessment on day 14.
A multicentre, controlled, randomized and blinded trial was carried out in 180 ruminating calves with pyrexia and respiratory sign(s) on nine Belgian, British and French farms. All animals were sampled for pathogenic bacteria before treatment and at failure/relapse. Calves were injected with either marbofloxacin (M) solution [Marbocyl (Laboratoire Vétoquinol, Lure, France) 10%] at 2 mg/kg/24 h for 4 days intravenously on the first day then subcutaneously, or tilmicosin (T) solution (Micotil, Elanco Products Ltd, Basingstoke, Hants, UK) at 10 mg/kg as a single subcutaneous (s.c.) injection. The animals were examined clinically eight times up to day 28. The bacterial pathogens were found to be sensitive to marbofloxacin: for Pasteurella haemolytica the minimum inhibitory concentration (MIC)90 was 0.08 microg/mL and for P. multocida the MIC90 was 0.04 microg/mL. Cure rates at day 4 for group M and group T were 84 vs. 82%, respectively (P > or = 0.05). However, overall clinical score was significantly lower after 1 day in group M (P < 0.05). There was no difference in either relapse rate or average daily weight gain between groups. Marbofloxacin was found to be better tolerated than tilmicosin at the s.c. injection site (77.5 vs. 42.2% calves without local swelling, P=0.001) and was well tolerated when injected intravenously. Marbofloxacin was shown to have comparable but faster efficacy and better local tolerance than tilmicosin in the treatment of bovine respiratory disease (BRD).
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