Humulin N or generic NPH, and their Novo Nordisk competitor Novolin N aka Insulatard and aka Protaphane, are available in the USA without a valid prescription. In the UK, Humulin N is known as Humulin I ("I" standing for its isophane suspension.). Aventis also makes a similar NPH insulin called Insuman Basal.
Humalog is a rapid-acting insulin treatment for diabetes, while Humulin is short-acting, according to Drugs.com. Humalog has an on-set time of 15 minutes, a peak effectiveness at 1 1/2 hours and a duration of two to five hours. Humulin has an on-set time of 30 to 60 minutes, a peak effectiveness between two and five hours and a duration of six ... Medscape - Diabetes dosing for Humulin R, Novolin R (insulin regular human), frequency-based adverse effects, comprehensive interactions, contraindications, pregnancy & lactation schedules, and cost information.