Attorneys representing both living and deceased patients of an Oregon hospital filed a $303 million lawsuit against the facility on Tuesday after a nurse was accused of replacing prescribed fentanyl with nonsterile tap water in intravenous drips.

The wrongful death and medical malpractice complaint accuses Asante Rogue Regional Medical Center in Medford of negligence. The suit says the hospital failed to monitor medication administration procedures and prevent drug diversion by their employees, among other claims.