I'm a male who wants to have real breasts like a female. What medicine should I take?

Unfortunately there are no effective medication which will give males female-like breasts so I advise you to be wary of drugs that are advertised as such. The most effective way to achieve natural looking female breasts is to consult with a board-certified plastic surgeon who specializes in gender reassignment surgery if this is what you are seeking. There are reputable plastic surgeons who have expertise in this area of surgery, and you can contact the American Board of Plastic Surgery to help in your search.

I don't think a surgeon would offer this kind of advice over the internet. Best advice is to consult at a gender identity clinic, and get lined up with a physician who can advise, prescribe, and follow your clinical course. Best wishes