How can someone with attention deficit problems concentrate at

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Find out what your attention span is, for example by writing a short story with a stopwatch so you know when you're getting distracted and how long it typically takes.
Divide what you have to do into tasks small enough to complete during that period, for example write one sentence at a time, let your brain wander a bit, and write another.
Over time, work on lenghtening your attention span. Try lenghtening those tasks, or trying to complete two at a time.
It's not easy and it's not a full solution to the problem (more like working around it), but it does help without the need for meds.