Drug interactions
Dexamethasone-tobramycin + Insulin inhaled
Severity: Moderate
Dexamethasone-tobramycin and Insulin inhaled: 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
Corticosteroids raise blood glucose by increasing hepatic gluconeogenesis and causing insulin resistance, which counteracts insulin. Patients with diabetes may need higher mealtime insulin doses while on dexamethasone. Absorption from the ophthalmic route is low, so the effect is mainly relevant with systemic or extensive use.
What this interaction means in plain words
Dexamethasone-tobramycin and Insulin inhaled 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.
Why it happens
Pharmacodynamic antagonism: glucocorticoid-induced insulin resistance and increased hepatic glucose output.
What to do
Monitor blood glucose more often when dexamethasone is started, and adjust the insulin dose as needed. Reduce insulin again when the steroid is tapered or stopped to avoid hypoglycemia.
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
Frequently asked questions
Can I take Dexamethasone-tobramycin with Insulin inhaled?
MediHelp rates the interaction as moderate. Dexamethasone-tobramycin and Insulin inhaled 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. Corticosteroids raise blood glucose by increasing hepatic gluconeogenesis and causing insulin resistance, which counteracts insulin. Patients with diabetes may need higher mealtime insulin doses while on dexamethasone. Absorption from the ophthalmic route is low, so the effect is mainly relevant with systemic or extensive use.
How serious is the interaction between Dexamethasone-tobramycin and Insulin inhaled?
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 glucose more often when dexamethasone is started, and adjust the insulin dose as needed. Reduce insulin again when the steroid is tapered or stopped to avoid hypoglycemia.
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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