The best replacement for indacaterol is tiotropium.

The best alternatives to indacaterol are rated as following:
★★★★★  tiotropium
★★★★  formoterol
  tiotropio

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Speaking about indacaterol, one probably shouldn't forget about mometasone.

Other search terms related to indacaterol and their ratings are:
★★★★★ mometasone
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indacaterol
tiotropium
formoterol