Time may help cut the cost of drugs used to treat workers’ compensation cases, a new study by The Hartford Financial Services Group suggests.

The company’s recent annual survey of the top 25 drugs in workers’ compensation found overall pharmaceutical costs for its workers’ compensation claims actually dropped in 2005. The data suggests the decline is at least partly caused by the greater availability of generic substitutes, especially for the most popular and expensive name-brand drugs.

OxyContin ranks first among all drugs used in workers’ comp cases, the company reports.