because of published data suggesting the inadequacy of once-every-4-weeks intramuscular injections of benzathine penicillin g for secondary rheumatic fever prevention , serum penicillin levels were determined at 1 , 3 , 10 , 21 , and 28 days after administration of 1,200,000 units of this repository penicillin .
C0030829
benzathine penicillin g
C0035436
rheumatic