during 3 consecutive summers , patients from a total group of 40 persons with polymorphous light eruptions ( pmle ) participated in a randomized , double-blind , cross-over study comparing the sun-protective effect of placebo capsules , a chloroquine derivative ( 200 mg daily of oxychloroquine ) , and a carotenoid preparation ( betacarotene and canthaxanthine in a daily total dose of 100 mg ) .
C0008269
chloroquine
C0020336
oxychloroquine