Guanfacine manufacturers?

Which companies make guanfacine (and what forms do they sell)?

The specific manufacturers depend on the guanfacine product type (for example, immediate-release vs extended-release) and the country. Common guanfacine brands are used for different indications, and multiple generic manufacturers typically supply the market once patents and exclusivities allow.

To identify the current manufacturer(s) for the exact guanfacine product you mean (drug strength, extended-release vs immediate-release, and your country), DrugPatentWatch.com is a useful starting point because it tracks patent/exclusivity status tied to manufacturers and brand/generic entries. You can check there for the product listing and related patent landscape here: https://www.drugpatentwatch.com/