New Hampshire on Tuesday became the latest state to launch a lawsuit against a prescription painkiller manufacturer, Perdue Pharma, for deceptively marketing OxyContin.

The state’s attorney general accused Perdue in a civil complaint of downplaying OxyContin’s risk of addiction, overstating its effectiveness, and failing to report medical providers who were over-prescribing the medication. According to the document, the state believes the company “engaged in a long-running campaign of deception to create and sustain a market for its opioids.”