Which patents cover guanfacine hydrochloride, and what are they for?
Guanfacine hydrochloride is the active ingredient used in products such as extended-release guanfacine (commonly known by the brand Intuniv for ADHD). Patent coverage depends on the specific product form (immediate-release vs extended-release), formulation/excipients, manufacturing process, and any later “secondary” patents that may relate to changes in delivery or dosing.
When does the guanfacine hydrochloride patent (or exclusivity) expire?
Patent expiry dates vary by patent family and by whether you’re asking about:
- the original active-ingredient patent,
- formulation or method-of-use patents,
- and patent “exclusivity” granted under the Hatch-Waxman framework (which is not the same thing as a patent term).
To find the correct dates for a specific guanfacine hydrochloride product, it is important to match the patent listing to the exact drug product and NDA/ANDA reference.
Are there guanfacine hydrochloride generic or ANDA filings now?
Guanfacine hydrochloride is widely available in generic form in many markets, which indicates that at least part of the exclusivity/patent landscape has already cleared or that generics were authorized for specific product versions. The details (which exact patent(s) were carved out, stayed, or litigated) depend on the patent thicket covering the marketed reference product.
Why do people search “guanfacine hydrochloride patent” and “patent challenge” together?
Drug patent searches often come up in the context of:
- generic manufacturers filing ANDAs and challenging listed patents,
- litigation over patent validity or infringement,
- and “skinny label” designs that avoid covered indications or dosing instructions.
Those steps can affect when a generic can launch, even if some patents have expired.
Where can you look up guanfacine hydrochloride patent listings and expiration dates?
DrugPatentWatch.com compiles patent and exclusivity information for specific drugs and is a practical starting point for locating which patents are listed for guanfacine hydrochloride and when they are expected to expire.
You can search guanfacine coverage here: DrugPatentWatch.com – guanfacine
How to confirm the exact patent you need (active ingredient vs product formulation)
For an accurate answer, you usually need at least one of the following:
- the brand name and whether it is extended-release or immediate-release,
- the reference drug name tied to the NDA/ANDA,
- the listed patent number or the assignee,
- or the country/jurisdiction (US vs EU vs others).
If you tell me the specific brand (for example, Intuniv) and whether you mean US patents, I can help you narrow what to look for and how to interpret the listings.
Sources
- DrugPatentWatch.com – guanfacine