Can I take both citalopram 20mg and quetiapine 25mg at bedtime? I take citalopram in the evening because I find it makes me sleepy during the day.

It is generally recommended to increase one medication at a time and wait a few days before increasing the second one. You can take both medications together, and if you want to switch the timing of when you take citalopram, you can gradually transition to taking it in the morning. As for stopping quetiapine, at the dosage mentioned, it is usually safe to stop it suddenly if needed and keep it for emergencies.