I did a quick internet search for 'side effects Adderall' as well as for 'Strattera.' I think this website sums it up well - http://www.strattera.com/1_2_taking_strattera/1_2_4_safety.jsp:
"Some children may lose weight when starting treatment with Strattera. As with all ADHD medications, growth should be monitored during treatment."
If your physician is unconcerned at the moment, then I would try asking when he will start to worry or suspect the drugs as being either the cuplrit or contributing. Approaching your pharmacist and asking similar questions may also give you more information.