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The two are often believed to be interchangeable, but the main difference is that retinol is eventually converted into retinoic acid. Retinol is a natural form of vitamin A, while Retin-A is derived from retinoic acid, a synthetic derivative of vitamin A, and considered pharmaceutical.
Difference Between Coumadin and Lovenox. Although both medications are blood thinners, there are important differences between Coumadin and Lovenox (enoxaparin). Coumadin is an oral medication that is fairly inexpensive, while Lovenox comes in the form of an injection and is much more expensive. Also, there are no dietary restrictions when using Lovenox, as opposed to using Coumadin.