Drug interactions
Dexamethasone-tobramycin + Insulin nph
Severity: Minor
Dexamethasone-tobramycin and Insulin nph: 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
Dexamethasone raises blood glucose and increases insulin resistance, which can reduce the effect of insulin and raise requirements. This is clinically important with systemic therapy; topical dexamethasone-tobramycin rarely has an effect.
What this interaction means in plain words
Dexamethasone-tobramycin and Insulin nph have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Why it happens
Glucocorticoid-induced insulin resistance and increased hepatic gluconeogenesis oppose insulin action.
What to do
With systemic or extensive use, monitor blood glucose closely and increase insulin doses as needed, then reduce them when the corticosteroid is stopped.
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 Dexamethasone-tobramycin
Frequently asked questions
Can I take Dexamethasone-tobramycin with Insulin nph?
MediHelp rates the interaction as minor. Dexamethasone-tobramycin and Insulin nph have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Dexamethasone raises blood glucose and increases insulin resistance, which can reduce the effect of insulin and raise requirements. This is clinically important with systemic therapy; topical dexamethasone-tobramycin rarely has an effect.
How serious is the interaction between Dexamethasone-tobramycin and Insulin nph?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: With systemic or extensive use, monitor blood glucose closely and increase insulin doses as needed, then reduce them when the corticosteroid 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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