PT - JOURNAL ARTICLE AU - Hulbert, J. TI - Urinary tract infection and oral penicillin G AID - 10.1136/jcp.25.1.73 DP - 1972 Jan 01 TA - Journal of Clinical Pathology PG - 73--75 VI - 25 IP - 1 4099 - http://jcp.bmj.com/content/25/1/73.short 4100 - http://jcp.bmj.com/content/25/1/73.full SO - J Clin Pathol1972 Jan 01; 25 AB - The urinary excretion of three oral preparations of penicillin G was measured in six subjects. After a dose of 500 mg of potassium penicillin G the mean urine level was 597 μg/ml in the first of three two-hour periods, 324 μg/ml in the second, and 40 μg/ml between the fourth and sixth hours. Of the dose, 13·4% was excreted in the urine in 24 hours. Differences among the three preparations were not significant therapeutically. Most Gram-negative urinary pathogens are sensitive to 5-50 μg of penicillin G per ml. There is a rational basis for the use of oral penicillini G to treat urinary infection due to Gram-negative bacilli.