If my cats monthly flea medicine was applied 2 days ago and she has fleas, how long do I need to wait to try a different medicine?

It seems like the medicine isn’t working. When can I give her a new dose of something different?

submitted by /u/felorva
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from Pets https://www.reddit.com/r/Pets/comments/bwjay2/if_my_cats_monthly_flea_medicine_was_applied_2/