The best replacement for ecstasy is molly.

The best alternatives to ecstasy are rated as following:
★★★★★  molly
★  cocaine
★  ecstacy
★  mdma
★  methamphetamine
★  extacy
★  sensation
★  meth
★  lsd
  carnival sensation
  herbal ecstasy

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

Other search terms related to ecstasy and their ratings are:

★★★★★ ketamine
★★★★ taking ecstasy
You have in mind a companion for ecstasy and it is not yet here? Propose!

Google Trends

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