Distinguish between complementary and alternative medicine.

Defining Complementary and Alternative Medicine:
Complementary medicine is used in conjunction with more traditional remedies; alternative medicine is used by itself

Complementary medicine refers to healing practices and products that work in conjunction with traditional medicine. For example, a cancer patient receiving chemotherapy may also undergo acupuncture to help manage chemo side effects like nausea and vomiting.

 Alternative medicine differs in that it is not used as a complement to, but rather as a substitute for traditional therapy. An example would be a cancer patient who forgoes recommended chemotherapy and instead chooses to treat the disease with specific dietary changes.

More:
http://www.everydayhealth.com/alternative-health/the-basics.aspx

Complementary medicine is used together with conventional medicine as part of a modern integrative-medicine approach. Alternative medicine, on the other hand, has traditionally been used in place of conventional medicine.

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