A generic drug is a copy of the brand-name drug with the same dosage, safety, strength, quality, consumption method, performance, and intended use. Before generics become available on the market, the generic company must prove it has the same active ingredients as the brand-name drug and works in the same way and in the same amount of time in the body.
The only differences between generics and their brand-name counterparts is that generics are less expensive and may look slightly different (eg. different shape or color), as trademarks laws prevent a generic from looking exactly like the brand-name drug.
Generics are less expensive because generic manufacturers don't have to invest large sums of money to develop a drug. When the brand-name patent expires, generic companies can manufacture a copy of the brand-name and sell it at a substantial discount.
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Nafarelin belongs to a group of medications known as gonadotropin-releasing hormone (GnRH) analogues. It is used to relieve the symptoms of endometriosis (e.g., pelvic pain, dysmenorrhea (painful menstruation)), and to reduce the size and number of endometriotic lesions.
The usual recommended dose of nafarelin nasal spray is one spray (200 µg) into one nostril in the morning, and one spray into the other nostril in the evening, about 12 hours between doses, for a total daily dose of 400 µg. Some women may require higher doses (e.g., 800 µg per day).