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100% activity is attained after 24 hours. It is also described therein that, 6 hours after oral administration to cats, nitenpyram reaches an activity of 60% against the fleas present on the cats, and on the second day after renewed infestation it still gives 55% activity.
Onset/duration: Novolin n (a brand of nph) is an intermediate acting insulin. It starts working after a few hrs, peaks in 6-8 hrs and lasts 12-16 hrs. Novolog is a rapid acting insulin. It starts to work in a few mins, peaks in an hr or two, lasts 4 hrs or so.