He took them about one hour apart.
I have googled a similar issue before, but the simple answer is that 2 x 300mg of Seroquel XR is nothing. The maximum dosage is 800mg. A person will just feel extremely drowsy from taking a double dose on accident, and they should most likely just lie down and rest. I once took 2 x 400mg on accident and felt extremely light headed and unstable on my feet, so I went to sleep and just felt a bit more drowsy when I woke up. Since this question was posted in 2013, at this point I am just telling this to anyone else in a similar situation. If you are still worried, like suggested, a poison control center should be able to give you instructions and information.
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