The bitterness in a dream symbolizes trouble, hard work, or other people's opinions.
Dreaming of the bitterness of drugs reminds you to listen to the opinions and suggestions of others in your career and life, and not to be afraid of inner resistance.
Dreaming of other bitter tastes indicates that there is something troubling in your heart or frustration in life or emotion, and bitterness in your heart. You might as well find a friend to talk about it and put your troubles behind you.