TY - JOUR
T1 - Divalproex, lithium and suicide among Medicaid patients with bipolar disorder
AU - Collins, Jon C.
AU - McFarland, Bentson H.
N1 - Funding Information:
This work was supported in part by Abbott Laboratories. B.H.M. currently receives research grant funding from Eli Lilly. The authors have no other conflicts of interest.
PY - 2008/4
Y1 - 2008/4
N2 - Background: Suicide completion and attempted suicide are major concerns for people with bipolar disorder. Studies in the private sector have suggested that lithium treatment may be superior to divalproex therapy with regard to minimizing suicidal behavior among individuals with bipolar disorder. However, few data are available regarding Medicaid patients diagnosed with bipolar disorder. Methods: Subjects were 12,662 Oregon Medicaid patients diagnosed with bipolar disorder and treated with medication between 1998 and 2003. Outcomes measures were completed suicide and emergency department visits for suicide attempts (including non-fatal poisoning). Cox proportional hazards models were used to adjust for demographics, co-morbidity, and concurrent psychotropic medication use. Results: Divalproex was the most common mood stabilizer (used by 33% of subjects) followed by gabapentin (32%), lithium (25%), and carbamazepine (3%). There were 11 suicide deaths and 79 attempts. Adjusted hazard ratios (versus lithium users) for suicide attempts were 2.7 for divalproex users (p < 0.001), 1.6 for gabapentin users (not significant) and 2.8 for carbamazepine users (not significant). For suicide deaths, the adjusted hazard ratios were 1.5 for divalproex users (not significant), 2.6 for gabapentin users (p < 0.001), and not available for carbamazepine users. Limitations: It should be noted that subjects were not assigned at random to medication use, data on prior suicide attempts were not available, medication use was measured by automated pharmacy records, and duration of mood stabilizer utilization may have been brief. Conclusions: Lithium may have a protective effect with regard to suicide attempts among Medicaid patients with bipolar disorder. It remains unclear whether or not lithium protects these patients against completed suicide.
AB - Background: Suicide completion and attempted suicide are major concerns for people with bipolar disorder. Studies in the private sector have suggested that lithium treatment may be superior to divalproex therapy with regard to minimizing suicidal behavior among individuals with bipolar disorder. However, few data are available regarding Medicaid patients diagnosed with bipolar disorder. Methods: Subjects were 12,662 Oregon Medicaid patients diagnosed with bipolar disorder and treated with medication between 1998 and 2003. Outcomes measures were completed suicide and emergency department visits for suicide attempts (including non-fatal poisoning). Cox proportional hazards models were used to adjust for demographics, co-morbidity, and concurrent psychotropic medication use. Results: Divalproex was the most common mood stabilizer (used by 33% of subjects) followed by gabapentin (32%), lithium (25%), and carbamazepine (3%). There were 11 suicide deaths and 79 attempts. Adjusted hazard ratios (versus lithium users) for suicide attempts were 2.7 for divalproex users (p < 0.001), 1.6 for gabapentin users (not significant) and 2.8 for carbamazepine users (not significant). For suicide deaths, the adjusted hazard ratios were 1.5 for divalproex users (not significant), 2.6 for gabapentin users (p < 0.001), and not available for carbamazepine users. Limitations: It should be noted that subjects were not assigned at random to medication use, data on prior suicide attempts were not available, medication use was measured by automated pharmacy records, and duration of mood stabilizer utilization may have been brief. Conclusions: Lithium may have a protective effect with regard to suicide attempts among Medicaid patients with bipolar disorder. It remains unclear whether or not lithium protects these patients against completed suicide.
KW - Anticonvulsant
KW - Antiepileptic
KW - Carbamazepine
KW - Community mental health
KW - Gabapentin
KW - Mood stabilizer
KW - Valproate
KW - Valproic acid
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U2 - 10.1016/j.jad.2007.07.014
DO - 10.1016/j.jad.2007.07.014
M3 - Article
C2 - 17707087
AN - SCOPUS:39749094359
SN - 0165-0327
VL - 107
SP - 23
EP - 28
JO - Journal of Affective Disorders
JF - Journal of Affective Disorders
IS - 1-3
ER -