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Drug Interactions between Kaletra and Norvir

This report displays the potential drug interactions for the following 2 drugs:

  • Kaletra (lopinavir/ritonavir)
  • Norvir (ritonavir)

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Interactions between your drugs

No interactions were found between Kaletra and Norvir. This does not necessarily mean no interactions exist. Always consult your healthcare provider.


A total of 712 drugs are known to interact with Kaletra.


A total of 592 drugs are known to interact with Norvir.

Drug and food interactions


lopinavir food

Applies to: Kaletra (lopinavir / ritonavir)

Food may affect the absorption of lopinavir-ritonavir (brand name Kaletra) depending on whether you are taking the oral solution or the tablet. The oral solution should be taken with food to enhance absorption and help it work better. The tablet formulation can be take with or without food. Talk to your doctor or pharmacist if you have questions on how to take this or other medications you are prescribed. It is important to tell your doctor about all other medications you use, including vitamins and herbs. Do not stop using any medications without first talking to your doctor.

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ritonavir food

Applies to: Kaletra (lopinavir / ritonavir) and Norvir (ritonavir)

Ritonavir should be taken with food to lessen gastrointestinal side effects. It is important that you take this medication exactly as prescribed by your doctor. Do not change your treatment or stop treatment without first talking to your doctor.

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Therapeutic duplication warnings

Therapeutic duplication is the use of more than one medicine from the same drug category or therapeutic class to treat the same condition. This can be intentional in cases where drugs with similar actions are used together for demonstrated therapeutic benefit. It can also be unintentional in cases where a patient has been treated by more than one doctor, or had prescriptions filled at more than one pharmacy, and can have potentially adverse consequences.


Antiviral boosters

Therapeutic duplication

The recommended maximum number of medicines in the 'antiviral boosters' category to be taken concurrently is usually one. Your list includes two medicines belonging to the 'antiviral boosters' category:

  • Kaletra (lopinavir/ritonavir)
  • Norvir (ritonavir)

Note: The benefits of taking this combination of medicines may outweigh any risks associated with therapeutic duplication. This information does not take the place of talking to your doctor. Always check with your healthcare provider to determine if any adjustments to your medications are needed.

Drug Interaction Classification

These classifications are only a guideline. The relevance of a particular drug interaction to a specific individual is difficult to determine. Always consult your healthcare provider before starting or stopping any medication.
Major Highly clinically significant. Avoid combinations; the risk of the interaction outweighs the benefit.
Moderate Moderately clinically significant. Usually avoid combinations; use it only under special circumstances.
Minor Minimally clinically significant. Minimize risk; assess risk and consider an alternative drug, take steps to circumvent the interaction risk and/or institute a monitoring plan.
Unknown No interaction information available.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.