Hello all, So I am working on my medication sheets for nursing school and I came across a medication that was prescribed to my patient and I can't figure out exactly why. The medication is Quetiapine (seroquel) 12.5 mg PRN (q6h). He has a history of alzheimers and insomnia and I can't figure out if this med as been prescribed to help with the alzheimers or the insomnia. If it is for insomnia then why is it allowed for every 6 hours instead of just once a day? Thank you for your help!