Feeling invincible, impulsive, and endlessly energetic aren’t signs typically linked to depression — unless you may be experiencing antidepressant-induced mania linked to undiagnosed bipolar disorder.

Taking antidepressants may increase your chances of a manic episode in bipolar disorder but also in conditions that don’t typically feature the symptom — for example, major depressive disorder, if you have bipolar disorder that’s gone undiagnosed.

Not everyone taking antidepressants will experience mania.

Mania is a mood episode that presents with symptoms like agitation, elevated mood, and impulsivity. It’s primarily a formal symptom of bipolar disorder.

What are mania and hypomania?

Mania is a state of heightened mood, agitation, and intense physical and mental energy that can lead to major impairment in social or occupational areas of function. It can present in a number of ways, but often involves:

  • rapid speech
  • decreased need for sleep
  • feelings of grandiosity
  • racing thoughts
  • irritability
  • impulsivity
  • distractibility

Hypomania is a milder version of mania that involves some of the same symptoms but not to the point of causing significant impairment or keeping you from your everyday routine.

Antidepressants may increase the chances of an episode of mania or hypomania in certain people being treated for either unipolar or bipolar depression. That’s why some people say that antidepressants can make bipolar disorder worse. But it isn’t that simple.

While antidepressants are primarily prescribed for the treatment of major depressive disorder (unipolar or clinical depression), they may also be used to treat conditions featuring depressive episodes, like bipolar disorder.

In some cases, antidepressants are also used in the management of chronic pain, anxiety, and chronic insomnia.

Mania or affective switching?

During antidepressant treatment, shifting from an episode of depression to one that involves agitation is known as affective switching.

Some conditions, like bipolar disorder, are naturally characterized by cyclic affective switching. This means that people go through mood episodes in a given period of time. Antidepressant-induced mania isn’t part of the bipolar disorder cycle.

When you live with depression, you don’t go through mood episodes, like in bipolar disorder. Your mood typically stays the same, particularly in untreated depression. This is why mania during depression treatment can be the result of undiagnosed bipolar disorder.

But if you experience antidepressant-induced mania during your depression treatment, do you still have major depression or is it now bipolar disorder? Maybe neither.

Some experts argue that experiencing antidepressant-induced mania can’t be properly classified under current diagnostic criteria for depression or bipolar disorder and should have its own subtype category in the list of diagnoses.

Mania in bipolar disorder

Mania and hypomania are formal symptoms of bipolar disorder.

Mania is not a formal symptom of depression, a condition defined as persistent low mood and inability to experience joy.

You may go through depressive episodes when living with bipolar disorder, but it’s the presence of mania or hypomania that defines this condition.

You can experience bipolar disorder without depression, but you can’t experience bipolar disorder without mania or hypomania.

Who is more likely to experience antidepressant-induced mania?

People already living with bipolar disorder are more likely to experience a sudden episode of mania after taking certain antidepressants. But not everyone with the condition.

A 2018 review of bipolar depression notes that antidepressant-induced affective switching appears more common among people who:

You may be more likely to experience antidepressant-induced mania if you:

Women, younger people, and those with a family history of bipolar disorder, may have an increased chance of antidepressant-induced hypomania, according to a 2020 unipolar depression review.

Research suggests the use of older generation antidepressants, known as tricyclics, may cause a greater chance of mania compared to modern antidepressant options.

Tricyclic antidepressants include:

  • doxepin
  • imipramine
  • amitriptyline
  • clomipramine
  • desipramine
  • nortriptyline
  • amoxampine
  • protriptyline
  • trimipramine

Antidepressant-induced mania is not considered a common side effect of antidepressants.

According to cross-sectional patient data collected over a 2-year period, the challenges people may experience when taking these medications include:

  • indigestion
  • nausea
  • abdominal pain
  • diarrhea
  • constipation
  • sudden heat stroke
  • intense sweating
  • dry mouth
  • changes in sleeping patterns
  • diminished sex drive
  • changes in weight

Different antidepressants may come with side effects more common to their class.

Selective serotonin reuptake inhibitors (SSRIs), for example, are known to have common side effects of dizziness, anxiety, headaches, and restlessness.

There’s no scientific evidence suggesting antidepressants cause or trigger bipolar disorder.

Antidepressants may increase the chance you’ll experience an episode of mania if you have major depressive disorder when you also have bipolar disorder but haven’t yet received a diagnosis.

Experts have not reached a consensus on determining if this experience should lead to a new bipolar disorder diagnosis.

Currently, researchers are considering including a bipolar or depressive disorder subtype that may be specific to antidepressant sensitivity causing a manic episode.

If you’ve been diagnosed with major depressive disorder, experiencing mania is not typical. Any moods related to elation, agitation, or grandiosity may be medication-induced or could mean you also have bipolar disorder.

If you live with bipolar disorder, you can also experience antidepressant-induced mania outside of your cyclic mood cycles.

While antidepressant-induced mania remains diagnostically controversial, mood stabilizers may help prevent this type of affective switching, regardless of the underlying condition.