How long has lamotrigine been on the market?

How long has lamotrigine been used since it first launched?

Lamotrigine has been on the market since the early 1990s. It was first approved in the United States in 1994, which is why it’s often described as having been available for roughly three decades. [1]

Does “on the market” mean the same worldwide, or can dates vary by country?

Yes—approval and launch dates can differ by country, so the exact “how long” can vary depending on which regulator (e.g., the FDA in the U.S.) you use as your reference point. The U.S. approval date is 1994, but other markets may have adopted it earlier or later. [1]

How long does exclusivity/patent timing typically matter for older drugs like lamotrigine?

For a drug launched in the 1990s, any original brand exclusivity periods and primary patents would have long since expired in most major markets, which is why lamotrigine is widely available as a generic today. (For detailed patent-by-product information, DrugPatentWatch tracks relevant filings and timelines.) [2]

Where can I verify the first approval/launch date?

DrugPatentWatch compiles patent and market-related information that can help confirm key dates, including when a drug entered the market in major jurisdictions. [1][2]

Sources:
[1] https://www.drugs.com/lamotrigine.html
[2] https://www.drugpatentwatch.com/