Reference cards tailored to your protocols for dose calcs would be a good idea. No one's at their best at 0300 hours. For dopa, it's easy. Mix 200 in a 250 bag, and to run at 10mcg/kg/min all you need to do is multiply the pt's weight in kg's by .75 (75%) and you have your drip rate. Try it the long way, it's 100% accurate, not just a ballpark figure.
For example, at that concentration, the 100kg pt gets 75gtts/min, the 80kg pt gets 60gtts/min, the 60 kg pt gets 45gtts/min. It's equally accurate for odd weights , such as 53, 77, 92 or whatever.
