Thanks for your query.
As you mentioned your wife was taking Monocef
(ceftrixone) and Levoflox (levefloxacin) for Urinary tract infection
. So far no any study showed that these drugs can delay periods, however researchers are studying if it really delays periods as some post-marketing side effects of ceftrixone related to periods have been reported.
However, stress caused by any infection can delay periods. you are advised to rule out pregnancy
and repeat urine analysis and urine culture to rule out infection.
Ceftrixone is safe during pregnancy but Levofloxacin
should be avoided during pregnancy.
Hope it helps.