Type of insulin	Onset	Peak (hours)	Duration (hours)	Cost*
Rapid-acting
Aspart (NovoLog)	5 minutes	1 to 2	3 to 4	$84
Lispro (Humalog)	5 minutes	1 to 2	3 to 4	78
Lispro pen	5 minutes	1 to 2	3 to 4	31 (3 ml)
Regular insulin injection	15 minutes	3 to 4	6 to 8	46
Intermediate-acting
Insulin isophane suspension (neutral protamine Hagedorn)	1 hour	6 to 8	12	35
Insulin zinc suspension (Lente)	1 hour	6 to 8	12	33
Long-acting
Glargine	1 hour	None	24	75
Glargine pen†	1 hour	None	24	30 (3 ml)