One thing schizophrenics and depressed patients know is that anhedonia is not caused by dysfunctional beliefs…If simple talk therapy, cognitive exercises and behavioural activation could improve our ability to experience pleasure, we wouldn’t be hearing about so many treatment-resistant patients. Moreover, the research shows that anhedonia in both these conditions is mainly caused by a dopamine dysfunction in the brain reward system, which is not addressed by SSRIs.
“Psychotherapy (CBT) for negative symptoms of schizophrenia”
“Grant et al. (2012) used cognitive therapy (CT) to correct dysfunctional beliefs about pleasure, cognitive abilities, performance and social functioning. Techniques included goal-setting, behavioral experiments, activity scheduling, and more. Several accommodations were used to work around neurocognitive impairments. CT was found to be superior in reducing avolition/apathy and improving levels of functioning. However, other negative symptoms did not improve significantly, such as affective flattening, alogia, and anhedonia- asociality.”
“CBT-n seemed effective in reducing negative symptoms. The changes were partially explained by a reduction in dysfunctional beliefs about cognitive abilities, performance, emotional experience, self-stigma, and social exclusion.”
Psychotherapy for anhedonia in depression
"Psychotherapy may be less appropriate for patients with melancholia (563), particularly if the symptoms prevent engagement with the therapist (e.g., lack of interest in activities).
Melancholic features describe characteristic somatic symptoms, such as the loss of interest or pleasure in all, or almost all, activities or a lack of reactivity to usually plea- surable stimuli."
SSRIs for anhedonia in depression
"When considered from the perspective of the tripartite model, these results suggest that SSRIs reduce levels of general distress and anxious arousal but have limited effects on the anhedonia dimension, perhaps even worsening these symptoms somewhat.
[…] suggest that an SSRI would not be the medication of choice if a primary goal was the reversal of anhedonia and an increase in positive affect. In fact, the inhibition of both positive and negative emotions by serotonin could explain the “flatness” of mood that some patients experience while taking SSRIs."
http://ps.psychiatryonline.org/doi/full/10.1176/appi.ps.52.11.1469#
SSRIs for negative symptoms of schizophrenia
“SSRI augmentation does not improve the negative symptoms of schizophrenia.”
Maybe sarcosine, or even minocycline