The best replacement for aminophylline is theophylline.

The best alternatives to aminophylline are rated as following:
★★★★★  theophylline
  terbutaline

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Speaking about aminophylline, one probably shouldn't forget about lexiscan.

Other search terms related to aminophylline and their ratings are:
★★★★★ lexiscan
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aminophylline
theophylline
terbutaline