So what was the treatment that enable you to increase your concentration? Not medication I hope. I'm bad at focusing on one thing for more that 30 mins at a time, and just accept it as one of those things in life.
I dont see any thing the matter with medication. Just like a diabetic person can not make insulin from their pancreas. An ADD person does not make enough dopamine in their brains to carry signals.
Medication of course needs to be prescribed my a medical Doctor and you should never take other peoples drugs.
There are a lot of variables, dosage, type of ADD, diet, lifestyle, history.