Stand firm, don't give in and understand that sometimes when you say no it really isn't registering. Its not always a ploy to get his own way so you want to be firm but don't go ballistic which is the normal adult reaction to repetitive nagging.
Something that may help is to make sure you engage his attention when you are saying no. Stop, get him to stop nagging and look you in the eye and calmly explain that the answer is no, plus explain why, if he will stay calm long enough for you to.
I think all kids try this not just the ADHD kids but yes stand firm.Read or listen to 1-2-3-Magic. I had the same problem and now I just explain why it is no and at the first whine or beg I say that's one! Usually these days it stops! is it just me? i can tell my son no or that he can't do it. and it seems like he just keep on and on asking like he thinks i'm going to get tired of hearing him and give in but i'm just as stubborn as he is. does anyone else have this problem? how do you solve this problem? lesnathan39078.8244212963