It is my understand that it can take up to 4-6 weeks to see improvements. It does depend on the kiddo though. Some medicines we have tried for my son I can see within a week or so (even thought they say 4-6 weeks) and some have taken longer to see. Just depends on how their body processes the medication. Are you seeing a psychiatrist? If so, I would ask them to do a cheek swap dna test that tests for what medications work best for him. My son was diagnosed at age 4 and we didn’t get one done (because I didn’t know about them) until he was 7 and I wish I would have had it sooner! Good luck!