What Is Quetiapine XR? Uses, Dosage, and What You Need to Know in 2026

Quetiapine XR — extended-release quetiapine fumarate, sold as Seroquel XR by AstraZeneca — is one of the most widely used psychiatric medications in the world. This comprehensive guide covers what it is, what it treats, how it's dosed, how to take it, and what key facts every patient and caregiver should understand in 2026.

What Is Quetiapine XR?

Quetiapine XR is an atypical antipsychotic (second-generation antipsychotic) belonging to the dibenzothiazepine chemical class. It works by blocking multiple receptor types in the brain — primarily dopamine D2 and serotonin 5-HT2A receptors — to help stabilize mood, reduce psychosis, and manage depressive and manic symptoms.

The "XR" designation stands for extended-release — meaning the tablet uses a specialized hydrophilic matrix technology to release quetiapine gradually over approximately 24 hours, allowing for once-daily dosing. This is different from the immediate-release (IR) version of quetiapine, which is taken two or three times per day.

What Is Quetiapine XR FDA-Approved to Treat?

Quetiapine XR has the following FDA-approved indications:

Schizophrenia: Adults and adolescents ages 13–17 (acute and maintenance treatment)

Bipolar I disorder — acute manic or mixed episodes: Adults and children 10–17 (as monotherapy or adjunct to lithium or divalproex)

Bipolar I disorder — acute depressive episodes: Adults (monotherapy)

Bipolar I disorder — maintenance: Adults (as adjunct to lithium or divalproex)

Major depressive disorder (MDD) — adjunctive treatment: Adults (added to an antidepressant; XR only — approved in 2009)

Off-Label Uses of Quetiapine XR

Quetiapine is also frequently prescribed off-label for conditions including generalized anxiety disorder (GAD), insomnia (low doses, typically 25–100 mg), post-traumatic stress disorder (PTSD), and obsessive-compulsive disorder (OCD) augmentation. The evidence base varies by condition — discuss these uses with your prescriber.

Quetiapine XR Dosage Strengths and Forms

Quetiapine XR is available in the following extended-release tablet strengths: 50 mg (peach), 150 mg (white), 200 mg (yellow), 300 mg (pale yellow), and 400 mg (white). All tablets are capsule-shaped and film-coated.

Typical dosing ranges by indication:

Schizophrenia: 400–800 mg/day; start at 300 mg on Day 1, titrate up

Bipolar mania: 400–800 mg/day; start at 300 mg Day 1, 600 mg Day 2

Bipolar depression: 300 mg/day; start at 50 mg on Day 1, increase by 100 mg/day to 300 mg; no additional benefit observed at 600 mg

MDD adjunctive: 150–300 mg/day as an add-on to antidepressants; start at 50 mg/day

How to Take Quetiapine XR

Take once daily in the evening

Take without food or with a light meal (approximately 300 calories) — a high-fat meal significantly increases drug absorption

Swallow tablets whole — do not crush, split, or chew (this destroys the extended-release mechanism)

Take at the same time each day for consistency

Do not stop suddenly — taper under your prescriber's guidance

Is Quetiapine XR a Controlled Substance?

No. Quetiapine XR is not a controlled substance under the U.S. Controlled Substances Act. It requires a prescription but does not require DEA scheduling or special state monitoring program checks. It can be refilled by electronic prescription or phone and is available through telehealth prescribers in most states.

How Much Does Quetiapine XR Cost?

Generic quetiapine XR costs approximately $30–$65 for a 30-day supply at retail, or as low as $2–$10 per month with GoodRx or similar discount programs. Brand-name Seroquel XR can cost $400–$800+ per month without assistance. Most insurance plans cover generic quetiapine as Tier 1 or Tier 2 with copays often under $30.

Once you have your prescription, medfinder can help you locate which pharmacies near you have your specific strength in stock. Enter your medication, dosage, and ZIP code, and we'll call local pharmacies and text you the results.

Curious about how quetiapine XR works in the brain? Read: How Does Quetiapine XR Work? Mechanism of Action Explained in Plain English