You started an antidepressant hoping to feel more like yourself again. Instead, you suddenly feel like you’re running on overdrive. You’re sleeping less but have more energy. Your thoughts are racing, your words are coming faster, and you’re taking on projects or risks that don’t feel like you.
Could your medication be playing a role?
For some people, antidepressants can contribute to mania or hypomania, especially when an underlying bipolar disorder hasn’t been recognized. Knowing the warning signs can help you understand when a mood change calls for a closer look.
What Is Mania?
Mania is a significant change in mood, energy, activity, and behavior that can interfere with everyday life. A person experiencing mania may seem almost “electrified”—full of energy, barely sleeping, talking quickly, and behaving in ways that are very different from their usual personality.
Some common signs include:
- Needing very little sleep without feeling tired
- Feeling unusually energetic or restless
- Having racing thoughts
- Talking much more or faster than usual
- Becoming easily distracted
- Feeling unusually confident or powerful
- Taking risks or making impulsive decisions
- Spending excessive amounts of money
- Becoming unusually irritable or agitated
- Experiencing paranoia, hallucinations, or delusions in severe cases
Not everyone experiences mania in exactly the same way, however. Some people feel euphoric and energized. Others become angry, restless, or extremely irritable. And sometimes, what looks like “just being in a great mood” from the outside is actually the beginning of a serious mood episode.
Can Antidepressants Trigger a Manic Episode?
They can, but the answer isn’t quite that simple.
Antidepressants are designed to help relieve symptoms of depression. But for someone with an underlying vulnerability to bipolar disorder, an antidepressant may contribute to a manic or hypomanic episode.
That’s one reason distinguishing ordinary depression from bipolar depression matters. Unfortunately, misdiagnosis is common. Someone may seek treatment because they feel deeply depressed, while previous periods of little sleep, unusually high energy, impulsivity, or racing thoughts may have been dismissed as personality traits or simply “good days.”
And if a person is treated for depression without recognizing an underlying bipolar disorder, the treatment plan may need to be reconsidered if manic symptoms appear.
What Does the Research Say?
The relationship between antidepressants and mania is complicated, and research does not support the idea that every antidepressant automatically causes mania.
A 2025 systematic review and network meta-analysis published in EClinicalMedicine looked at 13 randomized controlled trials involving 1,362 people with bipolar depression. Researchers found that no individual antidepressant had a statistically significant increase in the risk of switching to mania compared with placebo. However, some medications showed signals that warrant caution, which led the researchers to emphasize that treatment decisions should be individualized.
Why Can This Happen?
One possibility is that the antidepressant is revealing an underlying bipolar pattern that wasn’t previously recognized.
Bipolar disorder involves episodes of depression as well as mania or hypomania. Depression may be the symptom that causes someone to seek help, particularly if elevated periods have never been identified as problematic.
It’s also important to remember that a mood change after starting medication doesn’t automatically prove that the medication caused it. Mood episodes can occur as part of the natural course of bipolar disorder. Sleep deprivation, substance use, other medications, stress, and other factors can also affect mood and behavior.
Should You Stop Taking Your Antidepressant?
If you believe you’re experiencing symptoms of mania after starting an antidepressant, contact your prescribing provider as soon as possible. Your provider may review your medication, dosage, treatment history, sleep patterns, substance use, family history, and previous mood episodes. From there, they can determine whether your treatment plan needs to change.
Don’t stop or change your medication on your own unless a medical professional tells you to. Abruptly stopping an antidepressant or changing the dosage too quickly can cause unwanted withdrawal or discontinuation symptoms, such as dizziness, nausea, headaches, sleep problems, irritability, anxiety, mood changes, or flu-like sensations. A sudden change can also cause depression symptoms to return or become more severe.
When Does Mania Become an Emergency?
Mania can become dangerous when judgment is significantly impaired or when someone becomes disconnected from reality. These symptoms may indicate a need for immediate medical attention, possibly with inpatient treatment:
- Severe agitation or confusion
- Hallucinations or delusions
- Extremely reckless behavior
- Inability to sleep for extended periods
- Behavior that places the person or others in danger
- Thoughts of suicide or self-harm
- Inability to safely care for basic needs
Listen to What Your Mood Is Telling You
Antidepressants help many people, but sudden changes such as reduced sleep, racing thoughts, unusually high energy, impulsive behavior, or extreme irritability should be viewed with caution. If your mood changes after starting an antidepressant, talk with your healthcare provider. It may be a sign that your treatment plan needs a closer look.
At Raleigh Oaks Behavioral Health, we provide compassionate, evidence-based care for people experiencing depression, bipolar disorder, and other mental health concerns. If you or a loved one are struggling with significant mood changes, help is available. Contact us today for a free, confidential assessment or to learn more about the programs available at our Garner, North Carolina mental health treatment facility.
