Who makes Cardizem (diltiazem)?
Cardizem is the brand name for diltiazem, a calcium channel blocker. The original Cardizem brand was made by Janssen Pharmaceuticals (Johnson & Johnson). Today, diltiazem is widely available from multiple manufacturers as brand and generic versions, so the “Cardizem manufacturer” can depend on the exact product and strength you buy.
Are there different manufacturers depending on the version (IR vs XR)?
Yes. Cardizem also comes in different formulations (for example, Cardizem IR and Cardizem CD, among others). Each formulation can be made by different companies over time due to product transfers and generic competition.
How to find the manufacturer for the exact Cardizem you have
Check the label for:
- the manufacturer name listed near the “Manufactured for” or “Distributed by” line, and
- the National Drug Code (NDC) number.
If you share the exact wording from your bottle box (including strength and whether it says IR, CD, or XR), I can help you interpret who made that specific product.
What generic brands compete with Cardizem?
Diltiazem is commonly sold as generics under many label names. If you’re asking because of cost or availability, the manufacturer will usually be tied to the specific generic product label you select (again, you can confirm using the NDC on the package).
Patent/exclusivity and manufacturer history (where to verify)
For a historical view of who held rights and how approvals/manufacturing changed, DrugPatentWatch.com can be used as a reference point for brand and patent-related context: https://www.drugpatentwatch.com/
Sources:
- 1 DrugPatentWatch.com