Drug interactions
Atazanavir + Nizatidine
Severity: Major
Atazanavir and Nizatidine: major interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Atazanavir needs an acidic stomach for dissolution, and nizatidine raises gastric pH. This can substantially lower atazanavir levels and risk virologic failure and resistance.
What this interaction means in plain words
Atazanavir and Nizatidine can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Atazanavir belongs to Anti Virals; Nizatidine belongs to Gastrointestinal Tract.
Why it happens
Nizatidine raises gastric pH, reducing the pH-dependent solubility and absorption of atazanavir.
What to do
Give atazanavir with or at least 10 hours after the H2 blocker, and use ritonavir boosting at the labeled doses; avoid in treatment-experienced patients unless labeled adjustments are followed.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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Other interactions of Nizatidine
- Dasatinib + Nizatidine Major
- Erlotinib + Nizatidine Major
- Itraconazole + Nizatidine Major
- Ketoconazole + Nizatidine Major
- Nizatidine + Pazopanib Major
- Nizatidine + Rilpivirine Major
Other interactions of Atazanavir
- Alfuzosin + Atazanavir Contraindicated
- Atazanavir + Avanafil Contraindicated
- Atazanavir + Dronedarone Contraindicated
- Atazanavir + Eletriptan Contraindicated
- Atazanavir + Eplerenone Contraindicated
- Atazanavir + Ergotamine Contraindicated
Frequently asked questions
Can I take Atazanavir with Nizatidine?
MediHelp rates the interaction as major. Atazanavir and Nizatidine can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Atazanavir needs an acidic stomach for dissolution, and nizatidine raises gastric pH. This can substantially lower atazanavir levels and risk virologic failure and resistance.
How serious is the interaction between Atazanavir and Nizatidine?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Give atazanavir with or at least 10 hours after the H2 blocker, and use ritonavir boosting at the labeled doses; avoid in treatment-experienced patients unless labeled adjustments are followed.
What other medicines interact with Nizatidine?
MediHelp also lists interactions of Nizatidine with, for example, Dasatinib, Erlotinib, Itraconazole. The full list is on the Nizatidine page.
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