Wirkt eine Pille MDMA?

That depends. If MDMA is actually present, an effect will occur. Then it is even that such pills are usually massively overdosed, so that only a fraction of them suffices to produce the full bandwidth of effects. Without drug checking, this illegal and unstandard product does not know what to take.

• https://www.eve-rave.org/drogen-abc/drugchecking/

General information on the effects and side effects as well as the risks associated with consumption can be found here:

• https://www.saferparty.ch/substances/mdma
• https://drugscouts.de/lexikon/mdma
• https://psychonautwiki.org/wiki/mdma