coumadin and cleanses

having had much success with my parasite cleanse, i'm almost ready to pursue the liver cleanse... but my husband, who has an artificial heart valve, is on the drug coumadin... this drug keeps his blood thin so no clots form on the valve, which of course would be deadly... knowing that coumadin is not the best drug, since it was originally made as rat poison, we are hopeful that we will find a natural blood thinning agent... in the meanwhile, he would like very much to do a parasite cleanse himself, but the herbs that are used to not mix with the coumadin (lessening it's effectiveness)... he's tried a week of oil of oregano even, but his blood test today indicated a .4 drop in his blood level .4 doesn't seem like a large amount, but it is evidence that the o of o has somewhat of a clotting factor in it... coQ10 is also on the No list, as it too has clotting factors... the Black-Walnut , Wormwood , and cloves is what i used, but cloves is also on the coumadin No list... any advise? anyone know of an antiparasitic that wouldn't interfer with his blood levels?