Drug interactions
Armodafinil + Guanfacine
Severity: Moderate
Armodafinil and Guanfacine: moderate 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
Armodafinil may reduce guanfacine concentrations, weakening blood pressure or ADHD symptom control.
What this interaction means in plain words
Armodafinil and Guanfacine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Armodafinil belongs to Central Nervous System; Guanfacine belongs to Cardiovascular.
Why it happens
Armodafinil induces CYP3A4, which is the main route of guanfacine metabolism.
What to do
Monitor blood pressure and clinical response and increase guanfacine dose as needed; for ER guanfacine in ADHD consider the labeled dose increase.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Armodafinil
Other interactions of Guanfacine
- Clonidine + Guanfacine Major
- Guanfacine + Lofexidine Major
- Aldesleukin + Guanfacine Moderate
- Amiodarone + Guanfacine Moderate
- Amisulpride + Guanfacine Moderate
- Amitriptyline + Guanfacine Moderate
Frequently asked questions
Can I take Armodafinil with Guanfacine?
MediHelp rates the interaction as moderate. Armodafinil and Guanfacine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Armodafinil may reduce guanfacine concentrations, weakening blood pressure or ADHD symptom control.
How serious is the interaction between Armodafinil and Guanfacine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor blood pressure and clinical response and increase guanfacine dose as needed; for ER guanfacine in ADHD consider the labeled dose increase.
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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