Antidepressants agitation from

Antipsychotic medications are indicated in the treatment of acute and chronic psychotic disorders. These include schizophrenia, schizoaffective disorder, and manic states occurring as part of a bipolar disorder or schizoaffective disorder. The co-adminstration of antipsychotic medication with antidepressants has also been shown to increase the remission rate of severe depressive episodes that are accompanied by psychotic symptoms. Antipsychotic medications are frequently used in the management of agitation associated with delirium, dementia, and toxic effects of both prescribed medications (e.g. L-dopa used in Parkinson s disease) and illicit dtugs (e.g. cocaine, amphetamines, andPCP). They are also indicated in the management of tics that result from Gilles de la Tourette s syndrome, and widely used to control the motor and behavioural manifestations of Huntington s disease. 

Apart from the antidepressant effect, acute effects occur that are evident also in healthy individuals. These vary in degree among individual substances and thus provide a rationale for differentiated clinical use (p. 233), based upon the divergent patterns of interference with amine transmitters/modula-tors. Amitriptyline exerts anxiolytic, sedative and psychomotor dampening effects. These are useful in depressive patients who are anxious and agitated. 

In general, the pattern of adverse reactions is similar among all the SSRIs and some of the other new antidepressants that block the reuptake of serotonin, especially venlafaxine. As a result, the FDA has required class label warnings for them in regard to suicidality and to the array of stimulant adverse reactions, from agitation and hostility to mania. 

Prozac and the other SSRIs, as well as any antidepressant that blocks the removal of serotonin from the synapse, can produce a well-documented, severe condition called the serotonin syndrome (Sternbach, 1991). This disorder includes the usual signs of overstimulation, such as euphoria and hypomania, agitation, confusion, and gastrointestinal upset, including diarrhea. However, the serotonin syndrome additionally involves overstimulation of the brain stem and spinal cord, producing fever and chills, severe incoordination, muscle spasms, and hyperactive reflexes. It bears some similarity to neuroleptic malignant syndrome, and like NMS it can also be lethal (chapter 4). 

The CNS manifestations of tricyclic antidepressant overdose may vary from mild agitation or drowsiness to delirium, coma, respiratory depression, or seizures. These manifestations are thought to result in part from central anticholinergic and antfliistaminic actions of these drugs. 

Another risk of antidepressants in vulnerable patients (particularly those with unrecognized bipolar depression) is switching, sometimes suddenly, from depression to hypomanic or manic excitement, or mixed, dysphoric-agitated, manic-depressive states. To some extent this effect is dose-related and is somewhat more likely in adults treated with tricyclic antidepressants than with serotonin reuptake inhibitors, bupropion, and perhaps with MAO inhibitors. Risk of mania with newer sedating antidepressants, including nefazodone and mirtazapine, also may be relatively low, but some risk of inducing mania can be expected with any treatment that elevates mood, including in children with unsuspected bipolar disorder. 

---