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"A 2018 article in the journal JAMA Psychiatry reports that lithium and long-acting antipsychotic injections were most effective at preventing re-hospitalizations among people with bipolar disorder.
The study by Markku Lähteenvuo and colleagues included 18,018 Finnish patients with bipolar disorder. A national database contained information on any hospitalizations that occurred among the patients and what medications were dispersed to patients.
Among the participants, 54% (9,721 patients) were re-hospitalized at least once over a study period of 16 years. Medications associated with the smallest risk of re-hospitalization for psychiatric reasons were long-acting injections of risperidone, gabapentin, long-acting injections of perphenazine, and lithium carbonate. When the researchers looked at hospitalizations for any cause (not just psychiatric illness), lithium was associated with the least risk of re-hospitalization, while benzodiazepines had the greatest risk, both for psychiatric re-hospitalization and re-hospitalization for any cause.
Long-acting injectable medications were associated with less risk of re-hospitalization compared to the identical medications delivered orally.
Lähteenvuo and colleagues concluded, “Lithium…should remain as the first line of treatment for bipolar disorder, after decades of underprescription.” They suggest that long-acting injectable medications may be a good alternative to prevent relapse in patients for whom lithium is unsuitable."