Drug interactions
Dicloxacillin + Ethinyl estradiol-levonorgestrel
Severity: Minor
Dicloxacillin and Ethinyl estradiol-levonorgestrel: 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
Penicillin-class antibiotics have been theorized to reduce contraceptive hormone levels through effects on gut flora. Controlled data do not show a meaningful increase in contraceptive failure.
What this interaction means in plain words
Dicloxacillin and Ethinyl estradiol-levonorgestrel have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Dicloxacillin belongs to Anti Bacterial; Ethinyl estradiol-levonorgestrel belongs to Endocrine.
Why it happens
Theoretical decrease in enterohepatic recirculation of ethinyl estradiol via altered gut flora; not established.
What to do
No additional contraception is routinely required; recommend backup contraception if vomiting or severe diarrhea occurs.
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 Ethinyl estradiol-levonorgestrel
- Ethinyl estradiol-levonorgestrel + Fezolinetant Contraindicated
- Ethinyl estradiol-levonorgestrel + Ombitasvir / paritaprevir / ritonavir and dasabuvir Contraindicated
- Ethinyl estradiol-levonorgestrel + Tranexamic acid Contraindicated
- Aminocaproic acid + Ethinyl estradiol-levonorgestrel Major
- Amobarbital + Ethinyl estradiol-levonorgestrel Major
- Anastrozole + Ethinyl estradiol-levonorgestrel Major
Other interactions of Dicloxacillin
- Dicloxacillin + Phenindione Major
- Atogepant + Dicloxacillin Moderate
- Axitinib + Dicloxacillin Moderate
- Bcg vaccine live + Dicloxacillin Moderate
- Cholera vaccine + Dicloxacillin Moderate
- Demeclocycline + Dicloxacillin Moderate
Frequently asked questions
Can I take Dicloxacillin with Ethinyl estradiol-levonorgestrel?
MediHelp rates the interaction as minor. Dicloxacillin and Ethinyl estradiol-levonorgestrel have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Penicillin-class antibiotics have been theorized to reduce contraceptive hormone levels through effects on gut flora. Controlled data do not show a meaningful increase in contraceptive failure.
How serious is the interaction between Dicloxacillin and Ethinyl estradiol-levonorgestrel?
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 additional contraception is routinely required; recommend backup contraception if vomiting or severe diarrhea occurs.
What other medicines interact with Ethinyl estradiol-levonorgestrel?
MediHelp also lists interactions of Ethinyl estradiol-levonorgestrel with, for example, Fezolinetant, Ombitasvir / paritaprevir / ritonavir and dasabuvir, Tranexamic acid. The full list is on the Ethinyl estradiol-levonorgestrel page.
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