Can sertraline cause confusion?

Can Sertraline Cause Confusion?

Yes, sertraline can cause confusion, though it is not among the most common side effects. Confusion is specifically listed in the FDA drug label as a serious adverse event associated with several clinical scenarios, including serotonin syndrome, hyponatremia (low sodium), and withdrawal symptoms 1.

When Confusion Occurs with Sertraline

Serotonin Syndrome (Life-Threatening)

Confusion is a cardinal feature of serotonin syndrome, which can occur when sertraline is combined with other serotonergic medications or even at therapeutic doses in susceptible patients. This presents with 1:

• Confusion or other changes in mental status
• Agitation or hallucinations
• Coordination problems or muscle twitching
• Racing heartbeat, blood pressure changes
• Fever, sweating
• Muscle rigidity

Clinical Pearl: One case report documented serotonin syndrome with confusion, delirium, and agitation in a 75-year-old woman taking only 25 mg/day of sertraline (the minimum dose) when combined with sulpiride 2. This emphasizes that confusion can occur even at low doses, particularly in elderly patients or with drug interactions.

Hyponatremia (Especially in Elderly)

Low sodium levels are a recognized complication of sertraline, with elderly patients at greatest risk. The FDA label specifically lists confusion as a symptom of hyponatremia, along with 1:

• Headache
• Weakness or feeling unsteady
• Problems concentrating or thinking
• Memory problems

A 2025 pharmacovigilance analysis of 49,359 sertraline adverse event reports confirmed hyponatremia as a common adverse event in patients 65 years and older 3.

Overdose and Withdrawal

Confusion appears in two additional contexts:

• Overdose situations: A case report of a 1,500 mg sertraline overdose documented confusion along with agitation, tremors, and hyperthermia 4
• Abrupt discontinuation: Confusion is listed among withdrawal symptoms when sertraline is stopped suddenly 1

Clinical Implications

Monitor for confusion particularly in:

• Elderly patients (higher risk of hyponatremia)
• Patients on multiple serotonergic medications
• Those taking MAOIs, triptans, tramadol, or other SSRIs/SNRIs
• During dose initiation or changes
• If sertraline is abruptly discontinued

If confusion develops, immediately assess for:

1. Signs of serotonin syndrome (fever, muscle rigidity, autonomic instability)
2. Serum sodium levels
3. Recent dose changes or medication additions
4. Overdose possibility

The confusion typically resolves with discontinuation of sertraline or correction of the underlying cause (e.g., sodium replacement), as documented in case reports where symptoms resolved within 48-72 hours 4, 2.