Texas Attorney General Ken Paxton is investigating two pharmaceutical companies — Endo Pharmaceuticals and AbbVie Inc. — for allegedly advertising puberty blockers to children and their parents to treat gender dysphoria rather than the other medical conditions they are approved to treat.

Paxton opened the investigation in December and filed civil investigative demands with the two companies on Thursday.

This is the latest move in an ongoing effort by Paxton and Gov. Greg Abbott to limit access to gender-affirming medical care for transgender teens in Texas.

Gender-affirming care is a treatment model to address gender dysphoria, the distress a person feels when their gender identity does not match the sex they were assigned at birth. Young people often focus on social transition — dressing a certain way or using different pronouns — but can be prescribed puberty blockers or hormone therapy in consultation with a doctor.