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Atazanavir + Sildenafil

Gravità: Controindicata

Atazanavir and Sildenafil: contraindicated interaction.

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Sintesi

Atazanavir inhibits CYP3A4 and can markedly raise sildenafil exposure, increasing the risk of hypotension, syncope, visual disturbances and priapism. With the higher, chronic dosing used for pulmonary arterial hypertension the risk is unacceptable.

Cosa significa questa interazione in parole semplici

Atazanavir and Sildenafil are not normally used together. Taking them at the same time is expected to cause harm or make one of them unsafe, so a different medicine is usually chosen for one of the two.

Atazanavir belongs to Anti Virals; Sildenafil belongs to Genitourinary.

Livello di evidenza: Moderate

Perché avviene

Atazanavir inhibits CYP3A4-mediated first-pass and hepatic metabolism of sildenafil, raising its plasma concentrations.

Cosa fare

Do not combine atazanavir with sildenafil for pulmonary arterial hypertension. For erectile dysfunction, use a reduced sildenafil dose (for example 25 mg no more often than every 48 hours) and counsel on hypotension and priapism.

Cosa chiedere al farmacista

  • Is there an alternative to one of these two medicines for me?
  • If both are essential, who is monitoring me and how often?
  • Which symptoms mean I should stop and seek help straight away?

Bring a full list of your medicines, including over-the-counter products, supplements and herbal remedies, to every pharmacy visit.

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Domande frequenti

Can I take Atazanavir with Sildenafil?

MediHelp rates the interaction as contraindicated. Atazanavir and Sildenafil are not normally used together. Taking them at the same time is expected to cause harm or make one of them unsafe, so a different medicine is usually chosen for one of the two. Atazanavir inhibits CYP3A4 and can markedly raise sildenafil exposure, increasing the risk of hypotension, syncope, visual disturbances and priapism. With the higher, chronic dosing used for pulmonary arterial hypertension the risk is unacceptable.

How serious is the interaction between Atazanavir and Sildenafil?

MediHelp rates it contraindicated, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Do not combine atazanavir with sildenafil for pulmonary arterial hypertension. For erectile dysfunction, use a reduced sildenafil dose (for example 25 mg no more often than every 48 hours) and counsel on hypotension and priapism.

What other medicines interact with Sildenafil?

MediHelp also lists interactions of Sildenafil with, for example, Amyl nitrite, Cobicistat, Elvitegravir / cobicistat / emtricitabine / tenofovir df. The full list is on the Sildenafil page.

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