Medical studies conclude that certain adjunctive drugs effectively palliate the negative symptoms of schizophrenia, mainly<unk> . In one study, Maprotiline produced the greatest reduction in<unk>  symptoms with severity reduction in 50% of patients (out of 10). Of the negative symptoms of schizophrenia,<unk>  had the second best responsiveness to the drugs, surpassed only by attention deficiency. D-amphetamine is another drug that has been tested on people with schizophrenia and found success in alleviating negative symptoms. This treatment, however, has not been developed greatly as it seems to have adverse effects on other aspects of schizophrenia such as increasing the severity of positive symptoms.
Alogia
Distichia
Oral galvanism
Pellagra
Lonomia
Soteria 
Necrospermia
Koilonychia