NAFDAC explained that the 40 IU/ML insulin syringe was previously approved alongside the 100 IU/ML variant for administering Lente animal insulins, which were available in both strengths.

Thus, to provide syringes for the injection of insulins of U 10, U 20, U 40 and U 80 strengths, the manufacturer supplied a U 10–20 syringe, — used for U 10 and U 20 insulin, — a U 20–40 ...

0.5 mL syringes are for 30 to 50 units of insulin and are numbered at 1-unit intervals. 1.0 mL syringes are for doses more than 50 units of insulin and are numbered at 2 units per interval.