Mood Stabilizers for Depressive Disorders

Mood stabilizers are not the same thing as antidepressants.  Both classes of medications are sometimes used to treat the various forms of depression. Antidepressant medications work to lift a mood up out of a depressive episode.  Mood-stabilizing medications help to regulate mood and keep it from fluctuating either too high (into mania) or too low (into depression).

Lithium

The oldest and best mood stabilizer is lithium carbonate (lithium). Although this medication is primarily used to treat bipolar disorders, it can also be effective in helping with depressive symptoms. Sometimes, lithium is added on to an antidepressant medication treatment plan when antidepressants alone are not working.

Lithium is not a fun medication to take. Typical side effects include:

• tremors
• weight gain
• heavy urination
• excessive thirst
• decreased coordination
• reduced memory and concentration
• changes in hair quality and quantity
• nausea or diarrhea
• decreases in sexual desire and function
• increase in white blood cells.

Lithium treatment also reduces thyroid function by preventing the release of thyroid hormones.  This may make depression worse.

Lithium is also a potentially dangerous drug in that the dose necessary for it to offer antidepressant effects is uncomfortably close to its toxic dose. Toxic levels of lithium in the blood can cause slowed or stopped breathing, seizures, coma and even death.

Before taking lithium, a person will undergo a group of lab tests including:

• a complete blood count - this measures the number of red and white blood cells and platelets to ensure that these cells are at normal levels, there are no known infections, and that the body can function normally in case of an injury
• tests for serum creatinine - this is a test of kidney function. Since adequate kidney function is essential to clearing lithium from the system, this test is especially important.
• tests for electrolytes, hormones, (thyroid, in particular) and urine components - these indicate the basic health of an individual. They also provide baseline levels for comparison during lithium treatment.

To avoid lithium toxicity, people must have regular monitoring of their blood levels of lithium to make sure that they remain within an acceptable range. Blood lithium levels need to be monitored more frequently during the early stages of treatment.  As treatment stabilizes, monitoring can occur every three to six months.

Lithium is by no means the only mood stabilizing medication in use today. Please consult our Bipolar Disorder topic center for a more complete list of mood stabilizing medications.