Your doctor will monitor you for signs of methotrexate overdose. • Ciprofloxacin may inhibit the excretion of methotrexate via the kidney, causing an increased methotrexate level in the blood. • Pre-medicants (used before anaesthesia induction): it is recommended that opiate pre-medicants, (e. g. papaveretum) or opiate pre-medicants used with anticholinergic pre-medicants, (e. g. atropine or hyoscine) are not used concomitantly with ciprofloxacin, as the serum levels of ciprofloxacin are reduced.