DEA schedule
Is Theo-24 a controlled substance?
Theo-24 contains theophylline. Federal schedule from the FDA NDC directory, checked against the DEA controlled substances list.
Source: FDA NDC Directory file dated 2026-10-22. Publisher page
No. Theo-24 (theophylline) is not a federally controlled substance. None of its FDA NDC listings carries a DEA schedule, and theophylline is not on the DEA controlled substances list.
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Schedule check
| Source | What it lists |
|---|---|
| FDA NDC directory | 4 prescription listings from 1 labelers, none with a DEA schedule |
| DEA controlled substances list | theophylline is not on the list |
Theo-24 NDC listings
| NDC | Product | Form | Strength | Labeler | DEA schedule |
|---|---|---|---|---|---|
| 52244-100 | Theo-24 | capsule, extended release | 100 mg/1 | ENDO USA, Inc. | None |
| 52244-200 | Theo-24 | capsule, extended release | 200 mg/1 | ENDO USA, Inc. | None |
| 52244-300 | Theo-24 | capsule, extended release | 300 mg/1 | ENDO USA, Inc. | None |
| 52244-400 | Theo-24 | capsule, extended release | 400 mg/1 | ENDO USA, Inc. | None |
Questions
Is Theo-24 a controlled substance?
No. Theo-24 (theophylline) is not a federally controlled substance. None of its FDA NDC listings carries a DEA schedule, and theophylline is not on the DEA controlled substances list.
Is Theo-24 a narcotic?
No. Theo-24 (theophylline) is not on the DEA controlled substances list, so the DEA does not classify it as a narcotic. Its FDA established pharmacologic class is Methylxanthine.
Does this page cover state schedules?
No. This page reports the federal schedule only. Some states schedule drugs on their own; check your state board of pharmacy.