Taking 100mg seroquel (quetiapine) at night. will it work as a mood stabilizer at that dose?

Same deal: This is also something to bring up when you talk to your provider. Always ask these sort of questions when a medication or procedure is recommended. Doses are predicted by all sorts of factors including age/size/conditions, etc. Often they are slowly climbed to an effective level and maintained there. You'll help decide if this is too little, too much or just right! Best wishes!