Drug interactions
Dexamethasone-tobramycin + Guanfacine
Severity: Moderate
Dexamethasone-tobramycin 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
Dexamethasone may induce CYP3A4 and lower guanfacine concentrations, weakening its blood pressure or ADHD effect. The effect is relevant mainly with sustained systemic dexamethasone.
What this interaction means in plain words
Dexamethasone-tobramycin 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.
Dexamethasone-tobramycin belongs to Anti Bacterial; Guanfacine belongs to Cardiovascular.
Why it happens
Dexamethasone induces CYP3A4, increasing guanfacine metabolism.
What to do
With prolonged systemic dexamethasone, monitor blood pressure or ADHD symptoms and increase the guanfacine dose if response is lost. Reassess the dose when dexamethasone is stopped.
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 Dexamethasone-tobramycin
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 Dexamethasone-tobramycin with Guanfacine?
MediHelp rates the interaction as moderate. Dexamethasone-tobramycin 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. Dexamethasone may induce CYP3A4 and lower guanfacine concentrations, weakening its blood pressure or ADHD effect. The effect is relevant mainly with sustained systemic dexamethasone.
How serious is the interaction between Dexamethasone-tobramycin 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: With prolonged systemic dexamethasone, monitor blood pressure or ADHD symptoms and increase the guanfacine dose if response is lost. Reassess the dose when dexamethasone is stopped.
What other medicines interact with Dexamethasone-tobramycin?
MediHelp also lists interactions of Dexamethasone-tobramycin with, for example, Capreomycin, Carboplatin, Ciprofloxacin. The full list is on the Dexamethasone-tobramycin page.
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