Seeing poison signifies wealth. If a man sees someone make him drink poison and swellings appear on his body, he will attain wealth in proportion to the swelling that appears.
Drinking poison signifies long life.
Ibn Kathir said that seeing a known person give or make the dreamer drink poison signifies unlawful wealth that will come from that person.
Drinking poison and dying signifies a very long life. Possessing much poison and working with it signifies spending time on deeds that have no benefit for the Hereafter.
Seeing deadly poison signifies death. Poison also signifies sorrow and grief for the person who drinks it in a dream.