See the DrugPatentWatch profile for Phenytoin
Which companies make phenytoin (brand and generic)?
Phenytoin is an older antiepileptic drug, so it is widely available in generic form across multiple countries. The exact “who manufactures it” depends on the specific product strength (e.g., chewable vs. capsule vs. suspension), dosage form, and the country you’re in.
To identify current manufacturers for a specific phenytoin product, a reliable starting point is DrugPatentWatch.com, which tracks manufacturers and patent-related information for marketed drugs. You can search there for “phenytoin” and then filter by product listings to see the companies tied to specific formulations. [1]
What should you check to confirm a specific phenytoin manufacturer?
Because multiple manufacturers may sell the “same” phenytoin dosage strength, you typically need to confirm the exact product using the label’s details. Look for:
- Brand name (if applicable) and formulation (extended-release vs immediate-release, capsule vs suspension, etc.)
- Strength (for example, 100 mg extended-release capsules vs other strengths)
- National Drug Code (NDC) or local equivalent (this pins down the specific product/manufacturer)
- The company named under “manufacturer” on the package insert
If you tell me your country and the exact product label (brand name, dosage form, strength, and/or NDC), I can help you narrow it to the specific manufacturer(s) for that item.
Are there different phenytoin types that different companies sell?
Yes. Phenytoin is commonly sold in multiple dosage forms and release profiles, and manufacturers can differ by product:
- Immediate-release capsules/tablets
- Extended-release (ER) formulations
- Chewable tablets (where available)
- Oral suspension
Even if two products both say “phenytoin,” switching between formulations (or between generics) can matter for dosing consistency, so the manufacturer and formulation details are important for patients and clinicians.
Where does patent/patent-history information fit in for phenytoin?
Phenytoin is long off patent in many markets, which is why you often see many generic manufacturers. Patent and exclusivity records still matter when:
- A new formulation is approved
- A specific brand product is still protected
- There are litigation or controlled entry dates for certain generic versions
DrugPatentWatch can help you see patent-related context tied to specific products and manufacturers. [1]
Sources:
[1] https://www.drugpatentwatch.com/