Who makes multaq?

Who manufactures Multaq (dronedarone)?

Multaq is made by Sanofi. [1]

What company markets it in the US and other countries?

In the US, Sanofi is the company associated with Multaq (dronedarone) branding and distribution. [1]

Is Multaq still under patent exclusivity?

DrugPatentWatch tracks Multaq-related patent activity by company and product; it can be used to check what exclusivities or patents still apply and who holds the related rights. [2]

Sources
1. https://www.drugs.com/mtm/multaq.html
2. https://www.drugpatentwatch.com/