The Complete Guide to Interpreting Your Dreams

by Stearn Robinson - Tom Corbett
To dream that you had to take a laxative predicts that you will be called on to perform a difficult duty which will, however, be to your eventual credit, but if your dream concerned administering a laxative, it signifies a gain where you expected a loss.

See also Constipation, Bowel Movement, and Feces.

New American Dream Dictionary

by Joan Seaman - Tom Philbin
1. Emotional “constipation” or repression, often regarding a specific situation.

2. A need or desire for cleansing—often health related, possibly emotional.

3. Difficult work in the offing.

Strangest Dream Explanations

by Dream Explanations - Anonymous
Dreams of a laxative symbolize a need for release from negative and toxic thoughts and feelings. This dream reflects your desire to be rid of all that would weigh you down.