Online pharmacy company Truepill Inc. said it is temporarily halting prescriptions for Adderall and other controlled substances used to treat attention-deficit hyperactivity disorder, and partner Cerebral Inc. told its clinicians to direct those orders to patients’ local pharmacies.

Cerebral, an online mental-health company based in San Francisco that describes Truepill as its preferred pharmacy, informed its clinicians of Truepill’s decision in a Friday email viewed by The Wall Street Journal. The email said Truepill would no longer support mailing Schedule 2 controlled substances, including Adderall and Vyvanse, “to any of their customers.”