2 adjectives to describe soporific

Mr. SPECTATOR, 'I have read this Day's Paper with a great deal of Pleasure, and could send you an Account of several Elixirs and Antidotes in your third Volume, which your Correspondents have not taken Notice of in their Advertisements; and at the same time must own to you, that I have seldom seen a Shop furnished with such a Variety of Medicaments, and in which there are fewer Soporifics.

I have a little soporific in a paper packet that could be mixed with the whisky to make him sleep soundly.

2 adjectives to describe  soporific