Abacavir var ikke mutagent i bakterietests, men viste aktivitet in vitro i kromosomafvigelsesprøven med humane lymfocytter, muselymfomcelletesten og i in vivo mikronukleusundersøgelsen.
Abacavir was not mutagenic in bacterial tests but showed activity in vitro in the human lymphocyte chromosome aberration assay, the mouse lymphoma assay, and the in vivo micronucleus test.