Drug interactions
Dexamethasone-tobramycin + Levonorgestrel oral / ethinylestradiol / ferrous bisglycinate
Severity: Minor
Dexamethasone-tobramycin and Levonorgestrel oral / ethinylestradiol / ferrous bisglycinate: 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 is a weak CYP3A4 inducer and could modestly lower contraceptive hormone levels. With topical ophthalmic use systemic exposure is minimal and a meaningful effect is unlikely. With prolonged systemic dosing, a small reduction in contraceptive efficacy is theoretically possible.
What this interaction means in plain words
Dexamethasone-tobramycin and Levonorgestrel oral / ethinylestradiol / ferrous bisglycinate 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
Weak induction of CYP3A4 increasing the metabolism of ethinylestradiol and levonorgestrel.
What to do
No change is needed for short courses or ophthalmic use. For prolonged high-dose systemic dexamethasone, consider advising a backup contraceptive method.
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 Levonorgestrel oral / ethinylestradiol / ferrous bisglycinate?
MediHelp rates the interaction as minor. Dexamethasone-tobramycin and Levonorgestrel oral / ethinylestradiol / ferrous bisglycinate 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 is a weak CYP3A4 inducer and could modestly lower contraceptive hormone levels. With topical ophthalmic use systemic exposure is minimal and a meaningful effect is unlikely. With prolonged systemic dosing, a small reduction in contraceptive efficacy is theoretically possible.
How serious is the interaction between Dexamethasone-tobramycin and Levonorgestrel oral / ethinylestradiol / ferrous bisglycinate?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: No change is needed for short courses or ophthalmic use. For prolonged high-dose systemic dexamethasone, consider advising a backup contraceptive method.
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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