The best replacement for fipronil is imidacloprid.

The best alternatives to fipronil are rated as following:
★★★★★  imidacloprid
★★★  permethrin
★★★  etofenprox
★★★  hydramethylnon
★★  bifenthrin
★★  phenothrin
★  boric acid
★  avermectin
★  indoxacarb
★  chlorpyrifos
★  dinotefuran
★  methoprene
  cypermethrin
  spinosad
  selamectin
  propoxur

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No companions for fipronil have been suggested so far.
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Google Trends

Scale is based on the average worldwide traffic of fipronil in all years. Click on graph for more.
fipronil
imidacloprid
permethrin