A supposed aphrodisiac extracted from the beetle Lytta vesicatoria; cantharidin, the active ingredient, a vesicant used as a defence by L. vesicatoria and other blister beetles.
The beetle Lytta vesicatoria.
love drug
noun
The drug Viagra.
The drug ecstasy.
How often have the words Spanish fly and love drug occurred in a corpus of books? (source: Google Ngram Viewer )