MAINTENANCE OF THE BLOOD LEVEL OF PENICILLIN AFTER INTRAMUSCULAR INJECTION.

Blood concentrations of penicillin were maintained at measurable levels for as long as seven or eight hours following single intramuscular injections of penicillin in the dog and in patients by means of vehicles containing 6 per cent. to 20 per cent. ossein gelatin and a long-acting vasoconstrictor drug. Intramuscular administration of penicillin can thus be carried on with three instead of eight injections per day with less variation in the extremes of penicillin blood levels.