Drug interactions
Aripiprazole + Saquinavir
Severity: Major
Aripiprazole and Saquinavir: major interaction.
Last updated Sources: US FDA label
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
Saquinavir is a potent CYP3A4 inhibitor and can raise aripiprazole exposure, and it is itself associated with QT and PR prolongation. Aripiprazole has a small QT effect, so the main concern is increased aripiprazole adverse effects plus additive arrhythmia risk.
What this interaction means in plain words
Aripiprazole and Saquinavir 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.
Why it happens
Saquinavir inhibits CYP3A4-mediated aripiprazole metabolism and both drugs may have additive effects on cardiac repolarization.
What to do
Reduce the aripiprazole dose to about half the usual dose (per labeling for strong CYP3A4 inhibitors) and obtain a baseline ECG with monitoring. Correct potassium and magnesium and consider an alternative antiretroviral if QTc lengthens.
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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References
Other interactions of Aripiprazole
- Aripiprazole + Pimozide Contraindicated
- Aripiprazole + Thioridazine Contraindicated
- Amisulpride + Aripiprazole Major
- Aripiprazole + Arsenic trioxide Major
- Aripiprazole + Calcium / magnesium / potassium / sodium oxybates Major
- Aripiprazole + Carbamazepine Major
Frequently asked questions
Can I take Aripiprazole with Saquinavir?
MediHelp rates the interaction as major. Aripiprazole and Saquinavir 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. Saquinavir is a potent CYP3A4 inhibitor and can raise aripiprazole exposure, and it is itself associated with QT and PR prolongation. Aripiprazole has a small QT effect, so the main concern is increased aripiprazole adverse effects plus additive arrhythmia risk.
How serious is the interaction between Aripiprazole and Saquinavir?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Reduce the aripiprazole dose to about half the usual dose (per labeling for strong CYP3A4 inhibitors) and obtain a baseline ECG with monitoring. Correct potassium and magnesium and consider an alternative antiretroviral if QTc lengthens.
What other medicines interact with Aripiprazole?
MediHelp also lists interactions of Aripiprazole with, for example, Pimozide, Thioridazine, Amisulpride. The full list is on the Aripiprazole page.
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