Here's a Strattera dosing chart:
http://www.johnswank.com/strattera_dosing_chart.htm
Your son's target dose is 25 mg. Your doctor is doing what is recommended -- start low and build up to the target. It generally takes 4 to 6 weeks to see any positive results with Strattera.
i was wondering what the starting dose was when starting strattera,my son psych started him on 10mg for 7 days then 18mg for 7 days,is this about right for a beginning.my son is 7 and weighs a whopping 40 lbs.