Relapse-free efficacy at 6 months was 577 % ( 95 % CI 43-70 ) with tafenoquine 50 mg , 541 % ( 40-66 ) with tafenoquine 100 mg , 892 % ( 77-95 ) with tafenoquine 300 mg , 919 % ( 80-97 ) with tafenoquine 600 mg , 773 % ( 63-87 ) with primaquine , and 375 % ( 23-52 ) with chloroquine alone .