What the FDA labels say about taking them together
Ciprofloxacin and propranolol
Propranolol's FDA label of January 15, 2026 names ciprofloxacin in its drug interactions section; the ciprofloxacin labels PlainMeds reads (3) do not name propranolol. The propranolol label: “… with substrates or inhibitors of CYP1A2, such as imipramine, cimetidine, ciprofloxacin, fluvoxamine, isoniazid, ritonavir, theophylline, zileuton, zolmitriptan, and rizatriptan.”
Check it at the source: the ciprofloxacin FDA label on DailyMed (effective March 2, 2026, Bayer HealthCare Pharmaceuticals Inc.); the propranolol FDA label on DailyMed (effective January 15, 2026, Mylan Pharmaceuticals Inc.).
What does the ciprofloxacin label say about propranolol?
Ciprofloxacin's label (effective March 2, 2026) and its 2 other brand-application labels do not name propranolol in these sections. A label lists what its studies and reports found; it is not a complete list.
Source: FDA drug label (Cipro), Bayer HealthCare Pharmaceuticals Inc., effective March 2, 2026 (SPL set 888dc7f9-ad9c-4c00-8d50-8ddfd9bd27c0), via openFDA; the full label on DailyMed
What does the propranolol label say about ciprofloxacin?
Propranolol label, drug interactionsSubstrates or Inhibitors of CYP1A2 Blood levels and/or toxicity of propranolol may be increased by co-administration with substrates or inhibitors of CYP1A2, such as imipramine, cimetidine, ciprofloxacin, fluvoxamine, isoniazid, ritonavir, theophylline, zileuton, zolmitriptan, and rizatriptan.
Inderal Xl label (ANI Pharmaceuticals, Inc., August 27, 2026), drug interactionsImpact of Other Drugs on Propranolol CYP2D6, CYP1A2 and CYP2C19 Inhibitors: CYP2D6 inhibitors (e.g. bupropion, fluoxetine, paroxetine, quinidine), CYP1A2 inhibitors (e.g., ciprofloxacin, enoxamine, fluvoxamine) and CYP2C19 inhibitors (e.g., fluconazole, fluvoxamine, ticlopidine) increase exposure to propranolol when co-administered with INDERAL XL.
Source: FDA drug label (Inderal Xl, NDA021438), ANI Pharmaceuticals, Inc., effective August 27, 2026 (SPL set ac196ff5-9215-402b-bc57-69aa87f8bade), via openFDA
Source: FDA drug label (Propranolol Hydrochloride), Mylan Pharmaceuticals Inc., effective January 15, 2026 (SPL set b94dcec7-7633-4a33-9cea-48161adeaf93), via openFDA; the full label on DailyMed
These are the labels' own sentences. PlainMeds does not grade interactions; a pharmacist or prescriber can say what they mean for one person's medicines.
Both medicines on the record
| Ciprofloxacin | Propranolol | |
|---|---|---|
| Labeled for | Diarrhea, Urinary tract infections, Bacterial infections | High blood pressure, Angina, Atrial fibrillation, Migraine |
| Boxed warning | Yes | No |
| Pharmacy cost (NADAC) | $0.123 per tablet 500 mg tablet | $0.0493 per tablet 20 mg tablet |
| Shortage now | No current entry | In shortage |
Source: FDA NDC Directory, CMS NADAC of October 7, 2026 and the FDA Drug Shortage Database (FDA files October 8, 2026)
What next?
- Check more medicines together
- up to five at once