WARNINGS
Clinical Worsening And Suicide Risk
Patients with major depressive disorder (MDD), both adult
and pediatric, may experience worsening of their depression and/or the
emergence of suicidal ideation and behavior (suicidality) or unusual changes in
behavior, whether or not they are taking antidepressant medications, and this
risk may persist until significant remission occurs. Suicide is a known risk of
depression and certain other psychiatric disorders, and these disorders
themselves are the strongest predictors of suicide. There has been a
long-standing concern, however, that antidepressants may have a role in
inducing worsening of depression and the emergence of suicidality in certain
patients during the early phases of treatment. Pooled analyses of short-term
placebo-controlled trials of antidepressant drugs (SSRIs and others) showed
that these drugs increase the risk of suicidal thinking and behavior
(suicidality) in children, adolescents, and young adults (ages 18-24) with
major depressive disorder (MDD) and other psychiatric disorders. Short-term
studies did not show an increase in the risk of suicidality with
antidepressants compared to placebo in adults beyond age 24; there was a
reduction with antidepressants compared to placebo in adults aged 65 and older.
The pooled analyses of placebo-controlled trials in
children and adolescents with MDD, obsessive compulsive disorder (OCD), or
other psychiatric disorders included a total of 24 short-term trials of 9
antidepressant drugs in over 4400 patients. The pooled analyses of
placebo-controlled trials in adults with MDD or other psychiatric disorders
included a total of 295 short-term trials (median duration of 2 months) of 11
antidepressant drugs in over 77,000 patients. There was considerable variation
in risk of suicidality among drugs, but the tendency toward an increase in the
younger patients for almost all drugs studied. There were differences in
absolute risk of suicidality across the different indications, with the highest
incidence in MDD. The risk differences (drug vs placebo), however, were
relatively stable within age strata and across indications. These risk
differences (drugplacebo difference in the number of cases of suicidality per
1000 patients treated) are provided in Table 1.
Table 1
Age Range |
Drug-Placebo Difference in Number of Cases of Suicidality per 1000 Patients Treated |
|
Drug-Related Increases |
< 18 |
14 additional cases |
18-24 |
5 additional cases |
|
Drug Related Decreases |
25-64 |
1 fewer cases |
≥ 65 |
6 fewer cases |
No suicides occurred in any of
the pediatric trials. There were suicides in the adult trials, but the number
was not sufficient to reach any conclusion about the drug effect on suicide.
It is unknown whether the
suicidality risk extends to longer-term use, i.e., beyond several months.
However, there is substantial evidence from placebo-controlled maintenance
trials in adults with depression that the use of antidepressants can delay the
recurrence of depression.
All pediatric patients being
treated with antidepressants for any indication should be monitored appropriately
and observed closely for clinical worsening, suicidality, and unusual changes
in behavior, especially during the initial few months of a course of drug
therapy, or at times of dose changes, either increases or decreases.
The following symptoms,
anxiety, agitation, panic attacks, insomnia, irritability, hostility,
aggressiveness, impulsivity, akathisia (psychomotor restlessness), hypomania,
and mania, have been reported in adult and pediatric patients being
treated with antidepressants for major depressive disorder as well as for other
indications, both psychiatric and nonpsychiatric. Although a causal link
between the emergence of such symptoms and either the worsening of depression
and/or the emergence of suicidal impulses has not been established, there is
concern that such symptoms may represent precursors to emerging suicidality.
Consideration should be given to changing the therapeutic
regimen, including possibly discontinuing the medication, in patients whose
depression is persistently worse, or who are experiencing emergent suicidality
or symptoms that might be precursors to worsening depression or suicidality,
especially if these symptoms are severe, abrupt in onset, or were not part of
the patient's presenting symptoms.
Families and caregivers of patients being treated with
antidepressants for major depressive disorder or other indications, both
psychiatric and nonpsychiatric, should be alerted about the need to monitor
patients for the emergence of agitation, irritability, unusual changes in
behavior, and the other symptoms described above, as well as the emergence of
suicidality, and to report such symptoms immediately to health care providers.
Such monitoring should include daily observation by families and caregivers.
Prescriptions for LIMBITROL should be written for the smallest quantity of
tablets consistent with good patient management, in order to reduce the risk of
overdose.
Screening Patients For Bipolar Disorder
A major depressive episode may be the initial
presentation of bipolar disorder. It is generally believed (though not
established in controlled trials) that treating such an episode with an
antidepressant alone may increase the likelihood of precipitation of a
mixed/manic episode in patients at risk for bipolar disorder. Whether any of
the symptoms described above represent such a conversion is unknown. However,
prior to initiating treatment with an antidepressant, patients with depressive
symptoms should be adequately screened to determine if they are at risk for
bipolar disorder; such screening should include a detailed psychiatric history,
including a family history of suicide, bipolar disorder, and depression. It
should be noted that LIMBITROL is not approved for use in treating bipolar depression.
General
Because of the atropine-like action of the amitriptyline
component, great care should be used in treating patients with a history of
urinary retention or angle-closure glaucoma. In patients with glaucoma, even
average doses may precipitate an attack. Severe constipation may occur in
patients taking tricyclic antidepressants in combination with
anticholinergic-type drugs.
Patients with cardiovascular disorders should be watched
closely. Tricyclic antidepressant drugs, particularly when given in high doses,
have been reported to produce arrhythmias, sinus tachycardia and prolongation
of conduction time. Myocardial infarction and stroke have been reported in
patients receiving drugs of this class.
Because of the sedative effects of LIMBITROL, patients
should be cautioned about combined effects with alcohol or other CNS
depressants. The additive effects may produce a harmful level of sedation and
CNS depression.
Patients receiving LIMBITROL should be cautioned against
engaging in hazardous occupations requiring complete mental alertness, such as
operating machinery or driving a motor vehicle.
Usage In Pregnancy
Safe use of LIMBITROL during pregnancy and lactation has
not been established. Because of the chlordiazepoxide component, please note
the following:
An increased risk of congenital malformations
associated with the use of minor tranquilizers (chlordiazepoxide, diazepam and
meprobamate) during the first trimester of pregnancy has been suggested in
several studies. Because use of these drugs is rarely a matter of urgency,
their use during this period should almost always be avoided. The possibility
that a woman of childbearing potential may be pregnant at the time of
institution of therapy should be considered. Patients should be advised that if
they become pregnant during therapy or intend to become pregnant they should
communicate with their physicians about the desirability of discontinuing the
drug.
Withdrawal symptoms of the barbiturate type have occurred
after the discontinuation of benzodiazepines. (See Drug Abuse And Dependence
section.)