"While the dosage of the compounds may vary from and also depend upon the age and conditions of the patient, a kind of disease and a degree of the infection, and further a kind of the active compound (I') to be applied, etc., an average single dose of about 50 mg., 100 mg., 250 mg. and 500 mg. of the active compound (I') is sufficient for treating infectious diseases caused by pathogenic bacteria." . . . . .