Theophylline Anhydrous
Brand names: Theo-24, Theophylline, Theophylline Er
At a glance
- Medicare prescriptions, 2024
- 91,961
- Medicare drug cost
- $7.5M
- Average cost per prescription
- $81.64
- Clinicians who prescribed it
- 3,573
Where it is prescribed
List the prescribers in any state, county, city or ZIP code →
What it is used for
Theophylline is indicated for the treatment of the symptoms and reversible airflow obstruction associated with chronic asthma and other chronic lung diseases, e.g., emphysema and chronic bronchitis.
From the FDA-approved prescribing information (label dated December 2025). Full labels on DailyMed (opens in a new tab)
Who prescribes it
- Pulmonology 39.1%
- Internal Medicine 17.6%
- Family Medicine 15.8%
- Nurse Practitioners 11.4%
- General Practice 4.9%
- Physician Assistants 3.0%
- Critical Care Medicine 2.4%
- Allergy & Immunology 1.6%
- Cardiology 1.0%
- Geriatric Medicine 0.9%
- Sleep Medicine 0.3%
- Pediatrics 0.2%
All prescribers, by place, name or specialty →
Share of Medicare prescriptions written by each specialty. Select one to list its prescribers.
Trend, 2019–2024
Medicare prescriptions fell 47% from 2019 to 2024.
Biggest change by state since 2019
- Indiana −27%
- Puerto Rico −30%
- Mississippi −34%
- Florida −40%
- Louisiana −40%
- Iowa (smallest change) −57%
- Illinois (smallest change) −56%
From CMS’s yearly state and national Part D summaries, which count every prescriber, including those CMS leaves out of its per-clinician data (fewer than 11 prescriptions). That is why these totals are higher than the count at the top of this page. Prescriptions include refills.
What it looks like
Pills from 5 makers on file. The same medicine can look different depending on who made it, so check the imprint (the letters and numbers on the pill) with your pharmacist if a refill looks different.
Endo USA, Inc.
| Strength | Looks like | Imprint |
|---|---|---|
| 100 mg | orange capsule, 16 mm | THEO 24 100 MG AP 2832 |
| 200 mg | orange capsule, 19 mm | THEO 24 200 MG AP 2842 |
| 300 mg | orange capsule, 22 mm | THEO 24 300 MG AP 2852 |
| 400 mg | pink capsule, 22 mm | THEO 24 400 MG AP 2902 |
Golden State Medical Supply, Inc.
| Strength | Looks like | Imprint |
|---|---|---|
| 400 mg | white round tablet, 11 mm, scored to split in 2 | N T4 |
| 600 mg | white oval tablet, 19 mm, scored to split in 2 | NT6 |
Nostrum Laboratories, Inc.
| Strength | Looks like | Imprint |
|---|---|---|
| 400 mg | white round tablet, 11 mm, scored to split in 2 | N T4 |
| 600 mg | white oval tablet, 19 mm, scored to split in 2 | NT6 |
Proficient Rx LP
| Strength | Looks like | Imprint |
|---|---|---|
| 400 mg | white round tablet, 11 mm, scored to split in 2 | N T4 |
| 600 mg | white oval tablet, 19 mm, scored to split in 2 | NT6 |
Westminster Pharmaceuticals, LLC
| Strength | Looks like | Imprint |
|---|---|---|
| 400 mg | white round tablet, 11 mm, scored to split in 2 | N T4 |
| 600 mg | white oval tablet, 19 mm, scored to split in 2 | NT6 |
Source: DailyMed (U.S. National Library of Medicine), from each maker’s FDA drug listing. A few makers are shown, not every one. Never take a pill you can’t identify; ask a pharmacist.
Industry payments about this drug
No industry payments to clinicians named this drug in 2025.
Recalls and shortages
Not on the FDA drug shortage list.
3 recalls since 2020
- Aug 2025 · Glenmark Pharmaceuticals Inc., USA · Class II
Failed Dissolution Specifications: Failure results (above) were reported for the Dissolution (by UV) test for commercial annual stability at the long-term shelf life stability interval, wherein the dissolution results do not comply with L3 stage dissolution criteria. - May 2025 · Glenmark Pharmaceuticals Inc., USA · Class II
OOS results reported for the Dissolution (by UV) test. - Mar 2021 · Cardinal Health Inc. · Class II
CGMP Deviations: Intermittent exposure to temperature excursion during storage.
Recalls usually affect specific lots from one maker, not every version of a drug. Class I is the most serious; most drug recalls are Class II. FDA recalls (opens in a new tab)
Sources: CMS Medicare Part D Prescribers by Provider and Drug (2024; prescriptions include refills, and CMS hides counts under 11 per prescriber); U.S. Food and Drug Administration, openFDA (drug labels, NDC directory, enforcement reports, drug shortages); CMS Open Payments 2025; ClinicalTrials.gov. General information only, not medical advice; not yet reviewed by our medical reviewer.