My Granddaughter Is 23 Years Old And Is A Herion

My Granddaughter is 23 years old and is a herion addict for at least 3 years She also has mental issues probably from the Herion like Skits, physcios and extreme paranoid ,
Problem Her Dr prescribed several mess she does not take seroquil anymore however continues hydrooxyzine and dephcote Sorry spelling She has been on method employed for 4 days question will this do any worse damage than the herion