Search USP29  

An Injection is a preparation intended for parenteral administration or for constituting or diluting a parenteral article prior to administration (see Injections 1).
Each container of an Injection is filled with a volume in slight excess of the labeled “size” or that volume that is to be withdrawn. The excess volumes recommended in the accompanying table are usually sufficient to permit withdrawal and administration of the labeled volumes.
Recommended Excess Volume
Labeled Size For Mobile
For Viscous
0.5 mL 0.10 mL 0.12 mL
1.0 mL 0.10 mL 0.15 mL
2.0 mL 0.15 mL 0.25 mL
5.0 mL 0.30 mL 0.50 mL
10.0 mL 0.50 mL 0.70 mL
20.0 mL 0.60 mL 0.90 mL
30.0 mL 0.80 mL 1.20 mL
50.0 mL or more 2% 3%