Thanks for the citation! It does go into more detail, but whoever wrote the headline didn't read the actual text. It shouts "20% are on medication", but then goes on: "Twenty percent (20%) say that, in the past year, they have sought counseling or mental health treatment from a therapist. Among those who’ve gotten counseling or treatment in the past year, 68% are currently taking one or more prescription drugs for a mental health problem."
(IMHO, seems high, because only psychiatrists can prescribe drugs and many people only see therapists)