Was told that strattera (atomoxetine) can affect the heart's electrical conduction. is this rare or is it common amongst patients who take strattera (atomoxetine)?

I said that!: It prolongs the qt interval. For most people who are taking the recommended dose, this is of no consequence, but there are rarely people who have a genetic predisposition to have a very prolonged qt interval which is bad-they can't feel this and have no way to know it. It can only be seen on the ekg - thus you should get one after starting strattera (atomoxetine). If that's normal, nothing more to worry about!

It is uncommon: It is less common than with methylphenidate, and even there it is not common unless there is some preexisting, predisposing condition. Your doctor is practicing good medicine by checking an ekg first

Heart problems: Strattera (atomoxetine) has the same mechanism of action as the tricyclic antidepressants like imipramine. Rarely prolonged qt may occur as a result.