It also depends on the mg of the tabs ur friend took. how many mg were they?
Welcome to medhelp! You might need to take your friend to the hospital if he/she experiences the following symptoms: drowsiness, fast heart rate, feeling light-headed, or fainting. If he/she don't have any of these symptoms, then just chill. Don't forget to use common sense, if anything unusual happens you still have to take your friend to the hospital.
I would highly recommend going to the doctor. I am not trying to scare you, but taking 2 seoquel is not good. Get to a doctor.