A study finds drivers over age 80 or women over age 70 who take Ambien tend to have more motor vehicle collisions, reports Reuters.

“We stand behind the robust clinical data that have demonstrated the safety and efficacy of this product since its approval in the U.S. in 1992, representing more than 20 years of real-world use and 24 billion nights of patient therapy worldwide,” the spokeswoman told Reuters Health by email. “The U.S. FDA-approved label states do not take zolpidem unless you are able to stay in bed a full night (7-8 hours) before you must be active again.”