Thanks for your PM Sameericu, I have moved your thread to the ICU forum for more appropriate input.
From your message I understand the particular drugs your are interested in
are adrenaline, nor-adrenaline, dopamine and dobutamine.
Obviously there is a great deal of information already available about these drugs and I would suggest that you start with the medication information sheets that come with all drugs.
The drugs that you mention are all inotropic medications which alter the force of muscular contraction, the ones above are all positive inotropes which increase the force of contraction
Adrenaline or Ephinepharine which is a fight or flight hormone, it increases heart rate and stroke volume and contricts aterioles in the skin and gut.
It is used in cardiac arrest or other cardiac arrythmias that cause reduces cardiac output.
I remember a time when adrenaline infusion were used frequently in the ICU setting but there are better alternatives now and I believe it's use is much reduced.
Nor-Adrenaline (norepinepharine) has similar actions to epinepharine and if you do a little search through this section you will find quite a bit of information about it and it's side effects
Dopamine - the only time I have seen dopamine use is at a renal dose as it was thought to improve renal perfusion and reduce incidence or acute renal failure however I think this is now not the case.
http://www.bestbets.org/cgi-bin/bets.pl?record=00368
I am sure that there will be some very clever ICU nurses along shortly who will be able to give you more up to date information and uses of these drugs, it has been a while since I have worked in ICU so my information is mostly out of date.