Hi, I am 55 and have been on Concerta XL 38mg and 54mg for 6 months having recently been diagnosed. No problems with dispensing on the UK NHS but paid £1200 incl to get assessed. I did have some anxiety issues with 54mg so dropped back to 38mg. But have now raised to 54mg again and seems OK. It made a big difference to my concentration and I will see how it goes over the next 6 months.