Spanish fly
US /ˌspæn.ɪʃ ˈflaɪ/
UK /ˌspæn.ɪʃ ˈflaɪ/

1.
mouche espagnole, cantharide
a preparation made from dried beetles (family Meloidae) that contains cantharidin and was formerly used as an aphrodisiac, but is now known to be dangerous and ineffective for that purpose
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The old tale spoke of a love potion made with Spanish fly.
L'ancienne histoire parlait d'une potion d'amour faite avec de la mouche espagnole.
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Using Spanish fly is dangerous and can cause serious health problems.
L'utilisation de la mouche espagnole est dangereuse et peut causer de graves problèmes de santé.