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Drug Interactions between atazanavir / cobicistat and simeprevir

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

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Interactions between your drugs

Major

atazanavir simeprevir

Applies to: atazanavir / cobicistat and simeprevir

Using simeprevir together with atazanavir is not recommended. Combining these medications may significantly increase the blood levels of simeprevir. This may increase the risk of serious side effects such as skin rash and skin reactions to sunlight (photosensitivity), which may be severe enough to require hospitalization. Your doctor may be able to prescribe alternatives that do not interact. 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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Major

cobicistat simeprevir

Applies to: atazanavir / cobicistat and simeprevir

Using simeprevir together with cobicistat is not recommended. Combining these medications may significantly increase the blood levels of simeprevir. This may increase the risk of serious side effects such as skin rash and skin reactions to sunlight (photosensitivity), which may be severe enough to require hospitalization. Your doctor may be able to prescribe alternatives that do not interact. 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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Drug and food interactions

Moderate

atazanavir food

Applies to: atazanavir / cobicistat

Food can enhance the levels of atazanavir in your body. To ensure maximal oral absorption, atazanavir should be administered with or immediately after a meal. This will make it easier for your body to absorb the medication.

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Moderate

simeprevir food

Applies to: simeprevir

Food significantly increases the absorption of simeprevir. You should take each dose of simeprevir with food. Taking it on an empty stomach may lead to inadequate blood levels and reduced effectiveness of the medication.

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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.

Duplication

Protease inhibitors

Therapeutic duplication

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

  • atazanavir/cobicistat
  • simeprevir

Note: In certain circumstances, the benefits of taking this combination of drugs may outweigh any risks. Always consult your healthcare provider before making changes to your medications or dosage.

See also

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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.

Medical Disclaimer