Acute Treatment of Manic Episode
The following drugs may be used to treat manic episodes:
- Lithium (Eskalith®)
- Valproate (Depakote®)
- Carbamazepine (Tegretol®)
- Olanzapine (Zyprexa®)
- Ziprasidone (Geodon®)
- Risperidone (Risperdal®)
- Aripiprazole (Abilify®)
In August 2009, the U.S. Food and Drug Administration (FDA) approved the atypical antipsychotic drug asenapine (Saphris®) to treat bipolar I disorder and schizophrenia in adults. Asenapine side effects include decreased sensitivity in the mouth, drowsiness, and an inability to remain still or motionless.
These medications control mood swings and acute symptoms, manage recurrences, reduce the risk of suicide, and restore a sense of well-being.
Lithium revolutionized psychiatry when first introduced as a drug of treatment in the 1950s. The use of a simple salt to effectively treat mental illness supported the theory that chemical imbalances caused the disorders and dispelled beliefs that bad parenting or neglect were the only causes. Lithium is the mainstay of bipolar treatment, and the condition can often be controlled with lithium alone. It effectively treats both manic and depressive episodes and prevents devastating relapses. It typically takes 1 to 2 weeks for lithium to be effective.
There is a high rate of suicide among people with untreated bipolar disorder, and studies show that lithium treatment significantly reduces this risk. Conversely, patients who discontinue lithium treatment are 20 times as likely to commit suicide during the first 6 months following discontinuation.
Common side effects of lithium treatment include the following:
- Blurred vision
- Dry mouth
- Fine hand tremor
- Frequent urination
- Mild nausea, occasional vomiting
Long-term effects include weight gain, possible hypothyroidism, and kidney dysfunction. Patients who have kidney disease should not take lithium. Levels of lithium in the blood are monitored regularly to ensure that the proper concentration is maintained.
Lithium may cause birth defects and pregnant women should discuss the risks of taking the drug during pregnancy with their health care providers.
Valproate, which was initially used to treat seizures, is also approved to treat bipolar disorder. This drug is more effective than lithium in treating rapid-cycling bipolar disorder. Blood levels of valproate must be monitored regularly because high levels can be toxic. Common side effects of valproate include the following:
Long-term effects include weight gain and possible liver dysfunction. Patients with liver disease should not take this medication.
Carbamazapine is also an antiseizure drug. Although not approved by the FDA for the treatment of bipolar disorder, it can be used to control mania and depression in patients with the disorder. Common side effects include the following:
- Nausea and occasional vomiting
Long-term effects include reduced white blood cell count (leukopenia) and liver dysfunction. Patients who have liver disease should not take this drug. Blood levels of carbamazapine are monitored regularly.
Carbamazepine may cause birth defects and pregnant women should discuss the risks of taking the drug during pregnancy with their health care providers. Carbamazepine may cause oral contraceptive (i.e., birth control pill) failure. To avoid becoming pregnant, another form of birth control should be used while taking the drug.
Antipsychotic medications (e.g., olanzapine [Zyprexa®]) can be used to treat psychosis when it occurs in a manic episode. Symbyax® combines olanzapine with fluoxetine hydrochloride (the active ingredient in Prozac®) to treat bipolar disorder. Antipsychotic medications may cause serious long-term side effects (e.g., tardive dyskinesia) and should be used at the lowest effective dose and discontinued as soon as symptoms resolve.
Patients taking antipsychotic medications should be evaluated periodically to assess the need for maintenance therapy (see treatment of schizophrenia). Side effects include the following:
- Blurred vision
- Dry mouth
- Weight gain
Ziprasidone (Geodon®) is an antipsychotic medication that recently has been approved by the FDA to treat manic episodes. This medication, which also is used to treat schizophrenia, is prescribed at higher doses to treat bipolar disorder. Side effects include the following:
- Difficulty swallowing
- Extreme tiredness
- Increased or decreased body temperature
- Low blood pressure (dizziness, increased heart rate, fainting)
- Muscle spasms
Studies indicate that ziprasidone may cause fewer side effects (e.g., weight gain, movement disorders) than other medications.
Benzodiazepines are used to treat anxiety or agitation during a manic episode.
Risperidone (Risperdal®) has been approved by the Food and Drug Administration (FDA) as short-term treatment for acute mania associated with bipolar I disorder. This drug, which also is used to treat schizophrenia, may be used alone (called monotherapy) or in combination with lithium or valproate.
Side effects include the following:
- Excessive sleepiness (somnolence)
Aripiprazole (Abilify®) is a dopamine partial agonist that was approved by the FDA in 2002 to treat acute mania or mixed episodes in adults who have bipolar I disorder. In February 2008, this drug was also approved for use in pediatric patients between the ages of 10 and 17.
Patients who are taking aripiprazole should be monitored closely for unusual changes in behavior, worsening of symptoms, and suicidal tendencies. Side effects include nausea and vomiting, constipation, headache, dizziness, and insomnia. In children, common side effects include excessive sleepiness (somnolence) and headache. Elderly patients with dementia disorders are at higher risk for severe side effects and death.