Product Information
THEOPHYLLINE ER 300 MG TABLET is a generic product labeled by Heritage Pharmaceuticals Inc., priced at $0.3422 per EA under NDC 23155074101. Its NADAC has been published 202 times since Oct 12, 2022.
FDA first approved this application on Apr 30, 1990. Its Orange Book therapeutic-equivalence code is AB — FDA rates it therapeutically equivalent to (substitutable for) its reference product.
Strength
300 mg/1
Manufacturer
Heritage Pharmaceuticals Inc.NDC
23155074101
Classification
Generic
Dosage Form
TABLET, EXTENDED RELEASE
Route
ORAL
Effective Date
8/19/2026
Active Ingredients
THEOPHYLLINE ANHYDROUSApproval Type
Generic (ANDA)
FDA Application
ANDA089763FDA Approved
4/30/1990
TE Code
AB
On Market Since
6/27/2022
Pharmacological Classes
Price Statistics
The NADAC for THEOPHYLLINE ER 300 MG TABLET has been published 202 times since Oct 12, 2022, and over the history we have for it it has declined 88.6%. The table below summarizes its recorded NADAC range and movement.
| Current price | $0.3422 per EA |
|---|---|
| All-time high | $2.9916 (Oct 12, 2022) |
| All-time low | $0.3196 (May 20, 2026) |
| 52-week high | $0.5576 |
| 52-week low | $0.3196 |
| Median price | $0.9944 |
| Average price | $1.2344 |
| Largest weekly change | +88.5% (Aug 21, 2024) |
| Weeks tracked | 202 |
| Tracking since | Oct 12, 2022 |
Generic Alternatives
The matcher finds 9 manufacturers offering a NADAC-published product with this drug's active ingredient and strength in a comparable dosage form (cheapest from each manufacturer, up to 10 shown below). None of the shown alternatives sit below the current price. These are candidates to verify clinically, not guaranteed substitutes — see our generic drug prices guide.
Related Drugs
Same classification
Frequently asked questions
What is the NADAC price of THEOPHYLLINE ER 300 MG TABLET?
The current National Average Drug Acquisition Cost (NADAC) for THEOPHYLLINE ER 300 MG TABLET, manufactured by Heritage Pharmaceuticals Inc., is $0.3422 per EA (NDC 23155074101), effective Aug 19, 2026.
How has the price of THEOPHYLLINE ER 300 MG TABLET changed over time?
Over the history we have for it, the NADAC for THEOPHYLLINE ER 300 MG TABLET has declined 88.6%. It has been tracked across 202 weekly CMS publications since Oct 12, 2022.
What are the highest and lowest recorded NADAC prices for THEOPHYLLINE ER 300 MG TABLET?
Since Oct 12, 2022, the NADAC for THEOPHYLLINE ER 300 MG TABLET has ranged from a low of $0.3196 (May 20, 2026) to a high of $2.9916 (Oct 12, 2022), with a median of $0.9944 per EA.
Are there cheaper alternatives to THEOPHYLLINE ER 300 MG TABLET?
9 manufacturers publish a NADAC-priced product with the same active ingredient and strength as THEOPHYLLINE ER 300 MG TABLET in a comparable dosage form, but none are currently priced below it.
Who manufactures THEOPHYLLINE ER 300 MG TABLET?
THEOPHYLLINE ER 300 MG TABLET (NDC 23155074101) is labeled by Heritage Pharmaceuticals Inc., and CMS classifies it as a generic product.