Mood issues, and ADD and anxiety are on the spectrum of disorders very similar to bipolar, and treatment is basically the same, depending on the child's needs and symptoms.
The Balanced Mind is a fabulous resource for parents to learn how to parent their child and gives a lot of ideas and information about medications, whether the diagnosis is "mood disorder" or bipolar.
Treatment typically is: stabilize mood with a mood stabilizer medication such as Lamictal, depakote, tegretol etc.... Then, once mood is controlled, then deal with residual symptoms, such as anxiety, ADD etc...
Rages are difficult to see, handle and experience. Psychiatrists may try and treat those first, if they are extreme. Antipsychotics such as risperdal and seroquel target those types of behaviors very well.
I'd urge you to check out the Balanced Mind for support and helpful parenting strategies.
Personally my daughter has not tired either of these meds, but I do know others that have had success with them......That's the tricky part about medication - what works well for one, is a disaster for the next.
Not sure how old your son is, but I'd urge you to check out this organization for more info.
Yes, I have heard of amantadine, but not necessarily used to stabilize mood or rages.
Typically a mood stabilizer medication is needed for that - like Lamictal, lithium, tegretol, etc...
My daughter is on a mood stabilizer and an anti-psychotic med (seroquel). It is not unusual for a child to need both a mood stabilizer medication and an anti-psychotic med to even our their mood and get the rages under control.
Lamictal is typically most effective at a therapeutic range around 200mg to 250 mgs - what was your son's dose?