Marbocyl P 5mg, 20mg and 80mg Tablets Presentation Beige brown spotted round tablets Three strengths are available. Marbocyl P 5 mg containing 5 mg marbofloxacin. For use in dogs and cats. Marbocyl P 20 mg containing 20 mg marbofloxacin.For use in dogs. Marbocyl P 80 mg containing 80 mg marbofloxacin. For use in dogs.