"Bitters" usually contain more alcohol than is found in ale or wine, and sometimes more than in the strongest whiskey.

"Jamaica ginger" is almost pure alcohol.

Hence, it is often as harmful for a person to use these medicines freely as to use alcoholic liquors in any other form.
~20.~ Alcoholic liquors of all kinds are often adulterated.

That is, they contain other poisons besides alcohol.

In consequence of this, they may become even more harmful than when pure; but this does not make it safe to use even pure liquor.