Long- term carcinogenicity studies in rats and mice resulted in no carcinogenic or tumorigenic effects due to ciprofloxacin at daily oral dose levels up to 250 mg kg and 750 mg kg to rats and mice, respectively approximately 1. <a href=https://buydoxycyclineon.com/>doxycycline vomiting</a> Other parental 3rd generation cephalosporin plus doxycycline 100 mg PO bid for 14 d, with metronidazole 500 mg PO bid for 14 d.