Creativity suppression is a decrease in both a person's motivation and capabilities when performing tasks that involve producing artistic output or novel problem-solving.  This effect may be particularly frustrating to deal with for artists of any sort as it will induce a temporary creative block.
Although creative subjects paradoxically more often have a history of depression than the average, their creative work is not done during their depressions, but in rebound periods of increased energy between depressions.  
Creativity suppression is often accompanied by other coinciding effects such as depression  , anxiety, and emotion suppression in a manner which further decreases the person's creative abilities.  It is most commonly induced under the influence of moderate dosages of antipsychotics    . However, it can also occur due to SSRI's  and during the withdrawal symptoms of almost any dopaminergic compound. 
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