A Food and Drug Administration (FDA) letter warning a company about its marketing of injectable CBD products has led to a voluntary recall that the federal agency announced on Wednesday.

Biota Biosciences received the letter last month, with FDA directing the firm to cease sales of its line of CBD vials, which it markets as a pain reliever that serves as an alternative to opioids and can help with detoxification.

The agency said the company was violating federal statutes both by engaging in interstate commerce of an unapproved new drug and failing to properly label the products by neglecting to include directions for use.