The best replacement for ganirelix is lupron.

The best alternatives to ganirelix are rated as following:
★★★★★  lupron
★★★★  cetrotide
★★  cetrorelix

Your alternative for ganirelix is not listed? Suggest!
Speaking about ganirelix, one probably shouldn't forget about follistim.

Other search terms related to ganirelix and their ratings are:
★★★★★ follistim
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ganirelix
lupron
cetrotide