Celexa is not a mood stabilizer. It is a selective serotonin reuptake inhibitor (SSRI), a class of antidepressant. The FDA approved Celexa (citalopram) specifically for the treatment of major depressive disorder in adults, and its mechanism of action is fundamentally different from medications classified as mood stabilizers.
How Celexa Works
Celexa increases the availability of serotonin in the brain by blocking its reabsorption after nerve cells release it. This makes more serotonin available to improve signaling between neurons, which can relieve symptoms of depression like persistent low mood, loss of interest, and sleep disruption. It comes in 10 mg, 20 mg, and 40 mg tablets, with a typical starting dose of 20 mg once daily. The maximum recommended dose is 40 mg per day, and doses above that aren’t recommended because of the risk of heart rhythm changes.
For adults over 60 or those with liver problems, the maximum dose drops to 20 mg daily.
What Mood Stabilizers Actually Do
Mood stabilizers serve a different purpose entirely. They prevent or reduce the extreme swings between depression and mania that characterize bipolar disorder. Lithium, the oldest and most well-known mood stabilizer, is a first-line treatment for both acute episodes and long-term maintenance of bipolar disorder. It is also the only psychiatric medication shown to reduce suicide risk. Lamotrigine is another mood stabilizer, sometimes called the “mood stabilizer for depression” because it’s particularly effective at preventing the depressive episodes of bipolar disorder.
The key distinction: mood stabilizers work in both directions. They can bring someone down from mania and lift them out of bipolar depression while keeping mood within a stable range over time. Celexa only works in one direction, pushing mood upward by boosting serotonin. That one-directional effect is exactly why it can be problematic for people with bipolar disorder.
Why This Distinction Matters
If someone with bipolar disorder takes an antidepressant like Celexa without a mood stabilizer, it can potentially trigger a manic episode, a phenomenon called “switching.” A large network meta-analysis published in The Lancet reviewed 13 randomized controlled trials involving over 1,300 patients and found that while the overall risk of antidepressant-induced mania wasn’t statistically significant compared to placebo, certain antidepressants showed higher risk estimates than others. Among those studied, venlafaxine (an SNRI, not an SSRI like Celexa) showed the highest risk signal, though even that didn’t reach statistical significance.
The American Psychiatric Association’s guidelines for bipolar disorder are clear on this point: antidepressant monotherapy is not recommended for bipolar depression. During acute manic or mixed episodes, antidepressants should be tapered and discontinued if possible. For rapidly cycling bipolar disorder, most treatment guidelines recommend combining mood stabilizers and actively avoiding antidepressants.
Why People Confuse the Two
The confusion often arises because Celexa does stabilize mood in a general sense. If you have major depression, taking Celexa can make your emotional state feel more even and predictable. That everyday sense of “mood stabilization” is real, but it’s not what clinicians mean when they use the term. In psychiatric practice, “mood stabilizer” refers specifically to medications that manage the full cycle of bipolar disorder, preventing both highs and lows.
Another source of confusion is that Celexa is sometimes prescribed alongside a true mood stabilizer for people with bipolar disorder, particularly during depressive episodes. In that combination, the mood stabilizer acts as a guardrail against mania while the antidepressant addresses the depression. But even in that scenario, Celexa is playing the role of antidepressant, not mood stabilizer.
Conditions Celexa Treats vs. Mood Stabilizers
- Celexa (citalopram): FDA-approved for major depressive disorder. Often prescribed off-label for generalized anxiety disorder, panic disorder, and obsessive-compulsive disorder. Works by increasing serotonin levels.
- Lithium: First-line treatment for bipolar disorder, covering both manic and depressive episodes. Used for acute treatment and long-term maintenance.
- Lamotrigine: Mood stabilizer with particular strength in preventing bipolar depressive episodes. Also used as maintenance therapy.
If you’re taking Celexa and wondering whether it’s the right medication for mood swings that go in both directions, that’s a conversation worth having with your prescriber. The treatment approach for unipolar depression (major depressive disorder) and bipolar disorder looks very different, and using the wrong class of medication can make symptoms worse rather than better.