(1) A suspension of calcium penicillin in 40 per cent. iodized oil produces a stable mixture which has been instilled in the lungs of 12 patients without adverse effect and has maintained penicillin in the lung for a minimum of 24 hours, after a single instillation. (2) The penicillin iodized oil has maintained its potency for 60 days at ice box, room and 37 degrees C. temperatures.
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