[tim_h]

First, even if natrius cannot answer your question, absence of a counter-example does not constitute proof of your argument. Second, I've been taking an ADD medication called Dexadrine for about 10 years now, and in my opinion the effect on me has not diminished.

[sek]

I am not an expert, but when i read the other posts about Adderall(which is similar to Dexadrine afaik) it seems not problem free.

The article suggests Methylphenidate does not have positive long term implications, but here in Germany for example Dexadrine is not available as treatment for ADD. So you suggesting we have not access to the effective medication.

Just curious, did you stop it sometimes to check the difference? I was also diagnosed with ADD, but only took Ritalin over a short time when i was a kid.

[tim_h]

I don't know how similar/dissimilar Dexadrine and Adderall are, but they have really different effects on me. Adderall made me feel high, and seemed to encourage me to focus like a laser beam on low-level details. Dexadrine, on the other hand, has a very subtle effect on me. I've never felt high when taking it. It's more like a gradual transition into being able to focus at will. When it wears off I can no longer focus easily. On weekends I usually take half the usual dosage, and sometimes I skip taking it all together. When I skip it, aside from difficulty paying attention/focusing, I have mild withdrawal symptoms like feeling tired, headache and an increased appetite.

Having said all this, I want to point out that my doctor told me that different medications work for different people. I may just be lucky enough to have the right body chemistry for a drug like Dexadrine to work well for me.