This section is from the book "Botanic Drugs Their Materia Medica, Pharmacology and Therapeutics", by Thomas S. Blair. Also available from Amazon: Botanic Drugs, Their Materia Medica, Pharmacology and Therapeutics.
Garlic, Allium sativum. Has long been classed as stimulant, diuretic, expectorant, and rubefacient, and much used in domestic practice, both internally and as a poultice. It is listed in the National Formulary. In these domestic uses neither garlic nor the common onion (Allium cepa) are to be despised.
In The Lancet, Sept. 11, 1915, Cook and Gabriel, of Paddington Infirmary, report that a lotion of garlic juice is employed by them in wound dressing, and that it controls pus and relieves pain. They use one part of the fresh juice in 3 or 4 parts of distilled water. Free drainage is maintained and the wounds are washed out with the solution twice a day.
Enough alcohol may be added to preserve the solution.
Minchin has long employed garlic juice as an inhalation for the treatment of active mixed infections in pulmonary tuberculosis; it has a phenol coefficient of 2.