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IMO, stop thinking units and know the total dose you are injecting per fractional ml. Units on the syringe are useless unless you know the mcg per unit or 0.01 ml and that depends on the concentration. There are 100 units per 1 ml. If you mix 1 ml of water with 10 mg of PT-141 you have a concentration of 10 mg/ml and that would be 0.1 mg or 100 mcg per unit or 0.01 ml. So yes, 5 units (0.05 ml) would equal 500 mcg. Probably a good place to start at most to see if you experience any nausea, headache or flushing. I usually reconstitute if the vial is big enough for a maximal concentration of 2 mg/ml and inj a larger volume, easier IMO to the get dosing correct. Someone double check my math, its been a while since I've worked in a biochem lab.