Atazanavir and Lamotrigine interaction
Atazanavir and Lamotrigine: both prescribing labels flag this combination with the strongest language, such as a contraindication, a boxed warning, or an instruction to avoid it.
Do not combine without a prescriber's guidance. The label language below is the strongest FDA uses.
What the FDA labels say
From the Atazanavir (REYATAZ) label · effective 2024-12-05
Drug Class Drugs within class that are contraindicated with REYATAZ Alpha 1-adrenoreceptor antagonist Alfuzosin Anticonvulsants Carbamazepine, phenobarbital, phenytoin Antiarrhythmics Amiodarone (with ritonavir), quinidine (with ritonavir) Antimycobacterials Rifampin Antineoplastics Apalutamide, encorafenib, irinotecan, ivosidenib Antipsychotics Lurasidone (with…
Antiepileptics: carbamazepine ↓ atazanavir ↑ carbamazepine Coadministration of REYATAZ (with or without ritonavir) with carbamazepine is contraindicated due to the risk for loss of virologic response and development of resistance [see Contraindications (4) ]. phenytoin, phenobarbital ↓ atazanavir ↓ phenytoin ↓ phenobarbital Coadministration of REYATAZ (with or…
No dose adjustment of lamotrigine is required when coadministered with REYATAZ without ritonavir.
From the Lamotrigine (SUBVENITE) label · effective 2026-06-04
Atazanavir/ritonavir ↓ lamotrigine Decreased lamotrigine AUC approximately 32%.
Protease inhibitors lopinavir/ritonavir and atazanavir/lopinavir decrease lamotrigine exposure by approximately 50% and 32%, respectively.
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Open in the checkerNot medical advice. Interaction Checker quotes FDA label text and NIH fact sheets. Whether an interaction matters for you depends on doses, timing, kidney and liver function, and other conditions. Confirm with a pharmacist or prescriber.