Drug interactions
Armodafinil + Istradefylline
Severity: Minor
Armodafinil and Istradefylline: minor interaction.
Last updated
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
Istradefylline at higher doses inhibits CYP3A4 and may raise armodafinil concentrations, which could increase stimulant adverse effects such as headache, anxiety and insomnia. At lower doses the effect is minimal.
What this interaction means in plain words
Armodafinil and Istradefylline have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Armodafinil belongs to Central Nervous System; Istradefylline belongs to Central Nervous System.
Why it happens
CYP3A4 inhibition by istradefylline reduces armodafinil metabolism.
What to do
Monitor for stimulant adverse effects, especially at the highest istradefylline dose, and lower the armodafinil dose if they occur.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Armodafinil
Other interactions of Istradefylline
Frequently asked questions
Can I take Armodafinil with Istradefylline?
MediHelp rates the interaction as minor. Armodafinil and Istradefylline have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Istradefylline at higher doses inhibits CYP3A4 and may raise armodafinil concentrations, which could increase stimulant adverse effects such as headache, anxiety and insomnia. At lower doses the effect is minimal.
How serious is the interaction between Armodafinil and Istradefylline?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor for stimulant adverse effects, especially at the highest istradefylline dose, and lower the armodafinil dose if they occur.
What other medicines interact with Armodafinil?
MediHelp also lists interactions of Armodafinil with, for example, Avapritinib, Elacestrant, Elbasvir / grazoprevir. The full list is on the Armodafinil page.
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