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Fewer relapses in schizophrenia with long-acting injections

Karolinska Institutet Jun 22, 2017

The risk of relapse among patients with schizophrenia differs depending on what drug is administered, suggests a register study from Karolinska Institutet in Sweden published in the journal JAMA Psychiatry. Clozapine and long–acting injections were linked to fewer re–admissions to hospital than other antipsychotics.

researchers at Karolinska Institutet carried out a register–based study of 29,823 Swedish patients who were aged between 16 and 64 in 2006 and who were diagnosed with schizophrenia between 2006 and 2013. Every individual was used as his/her own control to eliminate selection bias that might otherwise occur, because patients who are more seriously ill are often treated with other drugs than those who are not as ill. The researchers then looked at what medications the patients had been used and if they had been admitted to hospital again, attempted suicide, stopped taking their medication or died.

“We saw considerable differences between the various antipsychotic treatments. Clozapine and long–acting injections were linked to the best results,” says Jari Tiihonen, specialist doctor and professor at Karolinska Institutet’s Department of Clinical Neuroscience.

The risk of the patients having been re–admitted to hospital was about 20–30 per cent lower if the patients were given long–acting injections of antipsychotic drugs compared to if the patients received the same medication but orally. This difference was in particular observed in those patients experiencing their first episode.

“Our findings indicate that the risk of the patient being admitted to hospital again varies between different antipsychotics,” says Jari Tiihonen.
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