TABLE 2.

BG content of intravenous antimicrobials^a

Medication	Concn of BG (pg/ml) at the:
	RVC	DIC	MPC
Colistin	4,348	627b	<4
Ertapenem	3,472	166	<32
Cefazolin (vials)	2,054	67	<4
Trimethoprim-sulfamethoxazole	1,187	<32	<8
Cefotaxime	560	153	<8
Cefepime	425	106	<8
Ampicillin-sulbactam	519c	<4	<8
Azithromycin	<62,500	<1,250	<8
Pentamidine	<5,000	<2,187	<4
Tobramycin	<1,600	<4	<4
Liposomal amphotericin B	<1,600	<16	4
Vancomycin	<800	<32	<4
Oxacillin	<800	4	<4
Itraconazole	<600	23	<4
Doxycycline	<600	<16	<4
Quinupristin-dalfopristin	<600	5	<4
Nafcillin	<400	22	<4
Rifampin	<400	23	<4
Chloramphenicol	<200	39	5
Amphotericin B deoxycholate	<200	NT	NT
Daptomycin	<200	Optical artifact	4
Voriconazole	<200	14	<4
Amikacin	<80	NT	NT
Aztreonam	<80	14	<4
Caspofungin	<80	NT	NT
Cefuroxime	<80	21	<4
Erythromycin	<80	NT	NT
Gentamicin	<80	NT	NT
Imipenem	<80	NT	NT
Piperacillin-tazobactam	<80	<16	<8
Ticarcillin-clavulanate	<80	13	8
Ampicillin	<40	NT	NT
Cefazolin (bag)	<32	<32	<4
Cefoxitin	<40	NT	NT
Ceftazidime	<40	NT	NT
Ceftriaxone	<40	NT	NT
Ciprofloxacin	<40	<4	<4
Clindamycin	<40	NT	NT
Fluconazole	<40	<4	<4
Levofloxacin	<40	<4	<4
Linezolid	<40	<16	<4
Meropenem	<40	NT	NT
Metronidazole	<40	6	<4
Penicillin G	<40	<16	<4
Tigecycline	<16	NT	NT

^aDrugs were ordered according to their BG reactivity. Antimicrobials that tested positive are listed first, followed by antimicrobials that inhibited the BG assay at the RVC. For positive or highly inhibitory assay results, the value provided is the average of three determinations. NT, not tested.

^bOnly one vial was reactive; the other two lots inhibited the reaction at dilutions up to 1:500 (<1,563 pg/ml of BG).

^cOnly one of three vials was reactive; the other two lots inhibited the reaction at dilutions up to 1:100 (<313 pg/ml of BG).