The best replacement for piperazine is pyrantel.

The best alternatives to piperazine are rated as following:
★★★★★  pyrantel
★★★  mebendazole
★  praziquantel

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

Other search terms related to piperazine and their ratings are:
★★★★★ mdea
You have in mind a companion for piperazine and it is not yet here? Propose!



Google Trends

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piperazine
pyrantel
mebendazole