Der rapporteredes oftere om udslæt hos børn (i en klinisk undersøgelse, der omfattede 57 børn, som fik efavirenz i en periode på 48 uger, blev der rapporteret om udslæt hos 46%) og var oftere mere omfattende end hos voksne (alvorligt udslæt blev rapporteret hos 5, 3% af børnene).
Rash was reported more frequently in children (in a clinical study including 57 children who received efavirenz during a 48-week period, rash was reported in 46%) and was more often of higher grade than in adults (severe rash was reported in 5.3% of children).