Seroquel XR 400mg QHS – Next Dose Timing
Take the next dose of quetiapine extended-release 400 mg approximately 24 hours after your last dose, at bedtime tonight. Quetiapine XR is formulated for once-daily dosing and should be taken at the same time each day to maintain stable therapeutic levels 1.
Dosing Schedule for Quetiapine XR
- Standard regimen: Once daily at bedtime (QHS)
- Timing: Approximately the same time each evening
- With or without food: Either is acceptable 1
The extended-release formulation is specifically designed to provide 24-hour coverage with a single daily dose, unlike immediate-release quetiapine which requires twice-daily dosing 2, 3.
If You Miss a Dose
If you realize you missed last night's dose:
- Take it as soon as you remember today if you're not close to tonight's scheduled dose
- Skip the missed dose if it's already close to your next scheduled bedtime dose
- Never double up – do not take two doses at the same time unless specifically instructed by your healthcare provider 1
- Call your provider if you're uncertain about timing 1
Important Considerations
Avoid abrupt discontinuation: If you've missed multiple doses or are considering stopping quetiapine XR, contact your healthcare provider first. Suddenly stopping can cause withdrawal symptoms including insomnia, nausea, and vomiting 1.
Maintain consistency: Taking quetiapine XR at the same time each evening optimizes therapeutic effect and minimizes side effects like daytime sedation 2, 4.
Common pitfall: Some patients confuse extended-release (XR) formulations with immediate-release quetiapine. The XR formulation you're taking (400 mg QHS) should never be split, crushed, or taken more than once daily, as this destroys the extended-release mechanism.