What the FDA labels say about taking them together
Amoxicillin and lansoprazole
Lansoprazole's FDA label of June 24, 2025 names amoxicillin in its contraindications (prescription label) section; the amoxicillin labels PlainMeds reads (2) do not name lansoprazole. The lansoprazole label: “Concomitant administration of clarithromycin with other drugs can lead to serious adverse reactions, including potentially fatal arrhythmias, and are contraindicated. Amoxicillin also has drug interactions.”
Check it at the source: the amoxicillin FDA label on DailyMed (effective February 22, 2024, Sandoz Inc); the lansoprazole FDA label on DailyMed (effective June 24, 2025, L. Perrigo Company).
What does the amoxicillin label say about lansoprazole?
Amoxicillin's label (effective February 22, 2024) and its 1 other brand-application label do not name lansoprazole in these sections. A label lists what its studies and reports found; it is not a complete list.
Source: FDA drug label (Amoxicillin), Sandoz Inc, effective February 22, 2024 (SPL set 13bd4214-9b7f-425b-af5f-fc1ddc678230), via openFDA; the full label on DailyMed
What does the lansoprazole label say about amoxicillin?
Lansoprazole label, contraindications (prescription label)For information about contraindications of antibacterial agents (clarithromycin and amoxicillin) indicated in combination with PREVACID or PREVACID SoluTab, refer to the Contraindications section of their prescribing information.
Lansoprazole label, drug interactions (prescription label)Combination Therapy with Clarithromycin and Amoxicillin Clinical Impact: Concomitant administration of clarithromycin with other drugs can lead to serious adverse reactions, including potentially fatal arrhythmias, and are contraindicated. Amoxicillin also has drug interactions. Intervention: See and in prescribing information for clarithromycin. See in prescribing information for amoxicillin.
Lansoprazole label, warnings and precautions (prescription label)For more information specific to antibacterial agents (clarithromycin and amoxicillin) indicated for use in combination with PREVACID or PREVACID SoluTab, refer to Warnings and Precautions section of their prescribing information.
Source: FDA drug label (Prevacid 24 HR), L. Perrigo Company, effective June 24, 2025 (SPL set 205c9c1e-b422-4e86-a4b0-714b608adc19), 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
| Amoxicillin | Lansoprazole | |
|---|---|---|
| Labeled for | Bacterial infections, Acid reflux and ulcers | Acid reflux and ulcers |
| Boxed warning | No | No |
| Pharmacy cost (NADAC) | $0.0788 per capsule 500 mg capsule | $0.106 per capsule 30 mg capsule |
| Shortage now | No current entry | No current entry |
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