In spite that the patients with long-acting neuropletics(LAN)can drop out and have relapses,its use allows a more long-lasting time and more stable plasmatic concentrations that supply clinical and neurocognitive advantages.

To analyze the symptomatology and neurocognitive differences(P300)among the patients that relapse after withdrawing from the previous treatment with oral antipsychotic as regards those treated with LAN.

34 schizophrenic patients with a history of at least one admission in a acute adult psychiatric ward.All the patients have been assessed with the Positive and Negative Syndrome Scale (PANSS) and with potential auditory evocations(wave P300).

Clinical profile: 73.5% suffers from paranoid schizophrenia.Only 32.4% shows antipsychotic monotherapy;the 61.8% have been prescribed with long-acting Risperidone.

PANSS: The patients who had at least two admissions and who in the previous admission received long-acting Risperidone,showed a PANSS-N punctuation lower than the rest of the patients(21.64±4.6 vs. 25.4±3.2)at the end of the last admission(p=0.037).The same takes place with PANSS-PG at the end of the last admission(30.71 ± 3.8 vs. 3.61 ± 5.89(p=0.012).

P300: The latency measures of P300 are lower in those patients who in the previous admission received a long-acting Risperidone treatment(average of 314±34.65msec vs. 344.67±24.67msec),being the differences statistically relevant(p=0.012).The ranges are higher in the patients treated with long-acting Risperidone in the previous admission(average 5.3 ± 2.44vs.5±2.64 μV),though the differences are not statistically relevant.

At the end of the last admission,the patients who in the previous admission received long-acting Risperidone,showed a PANSS-N,a PANSS-PG and a latency of P300 lower than the rest of the patients but the range of P300 was higher.