WASHINGTON (AP) - U.S. regulators took action Wednesday that will make it easier to get a cheaper, near-copy of a brand-name insulin at the drugstore.Doctors now have to specifically prescribe what’s called a biosimilar or OK substituting it for a more expensive brand-name insulin.Wednesday’s move by the Food and Drug Administration will allow pharmacists to automatically substitute the cheaper version, just as they do with generic pills for other kinds of drugs.It’s the FDA’s first approval of an "interchangeable" biosimilar, a near-copy of an injected biologic medicine that’s manufactured inside living cells.