I've read claims that garlic is one of the most healthy vegetables out there. I don't know ... but I do know that my stomach does get pretty upset if I eat raw garlic or too much garlic, so I generally try to avoid that nowadays (which is pretty hard, as I love garlic).
In my point of view, "medicine" is by definition not something healthy, but most often something one can take to reduce some symptoms and sometimes something one can take to combat some disease or disorder - but as @steemchiller says, it's wrong to take medicine when not being sick!
Garlic is mildly antibiotic and can help against bacterial infections - but as anyone ought to know, eating antibiotics is not good, it should only be done if it's strictly needed, and never to fight viral diseases!