Dr. Vinay Prasad, the controversial critic of the US Food and Drug Administration who took a top role at the regulatory agency in May, has resigned less than three months into the job.

Vinay Prasad, a top official at the Food and Drug Administration, has suddenly departed after a series of controversial decisions about a treatment for boys with Duchenne muscular dystrophy.

Dr. Vinay Prasad had been serving as the FDA's director of the Center for Biologics Evaluation and Research since May, and was later named chief medical and scientific officer.