Well my understanding is that stimulants should generally be prescribed for pronounced ADHD, even with a history of substance abuse- that's if the substance abuse problem is currently stabalized. If its ongoing, then perhaps treating the substance abuse first may take priority.

Strattera is effective in around 1/3rd to 1/2 people with ADHD. An non-response to Strattera does not in any way rule out the diagnosis of ADHD.

Strattera can help definitely, but it usually not as much as stimulants. It can take several weeks at a strong dose before benefits are solidly noticed. Typical adult dose is 80mg.