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Most medicines have generic names (according to their chemical structure) and a second brand name used by the pharmaceutical company manufacturing them. Usually, when a company develops a new medication they apply for a patent. After a number of years the patent expires and other companies may produce it. Norethisterone, for example, is the generic name of a progestogen. It is released by one company as
'Primolut N and by another as 'Utovlan'. Norethisterone is included in eleven oral contraceptive pills and twelve combined HRT preparations. The generic name and the brand name of a drug may vary from country to country.
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