Nostrum

Near-synonyms: paternoster, patent medicine, snake oil

Source: wiktionary

Nay, he would sometimes retire hither to take his beer, and it was not without difficulty that he was prevented from forcing Jones to take his beer too: for no quack ever held his nostrum to be a more general panacea than he did this; which, he said, had more virtue in it than was in all the physic in an apothecary's shop.

Source: wiktionary

In precisely the same way does a quack doctor prescribe his infallible nostrum to every patient, without taking into account differences of constitution, or [...]

Source: wiktionary

I stammered out some few halting words of congratulation and then sat downcast, with my head drooped, deaf to the babble of our new acquaintance. He was clearly a confirmed hypochondriac, and I was dreamily conscious that he was pouring forth interminable trains of symptoms, and imploring information as to the composition and action of innumerable quack nostrums, some of which he bore about in a leather case in his pocket.

Source: wiktionary