Drug interactions
Doxycycline + Ethinyl estradiol-norgestimate
Severity: Minor
Doxycycline and Ethinyl estradiol-norgestimate: 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
Tetracyclines were thought to reduce oral contraceptive efficacy, but pharmacokinetic and clinical data do not show a consistent loss of protection. Any risk is considered very low.
What this interaction means in plain words
Doxycycline and Ethinyl estradiol-norgestimate have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Doxycycline belongs to Anti Bacterial; Ethinyl estradiol-norgestimate belongs to Endocrine.
Why it happens
Hypothesized disruption of gut flora and estrogen enterohepatic recycling; not well established.
What to do
No routine backup method is required; reinforce adherence and advise backup if vomiting or 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-norgestimate
- Ethinyl estradiol-norgestimate + Fezolinetant Contraindicated
- Ethinyl estradiol-norgestimate + Ombitasvir / paritaprevir / ritonavir and dasabuvir Contraindicated
- Ethinyl estradiol-norgestimate + Tranexamic acid Contraindicated
- Aminocaproic acid + Ethinyl estradiol-norgestimate Major
- Amobarbital + Ethinyl estradiol-norgestimate Major
- Anastrozole + Ethinyl estradiol-norgestimate Major
Other interactions of Doxycycline
- Acitretin + Doxycycline Contraindicated
- Aminolevulinic acid + Doxycycline Major
- Cholera vaccine + Doxycycline Major
- Doxycycline + Isotretinoin Major
- Doxycycline + Methoxyflurane Major
- Doxycycline + Microbiota Major
Frequently asked questions
Can I take Doxycycline with Ethinyl estradiol-norgestimate?
MediHelp rates the interaction as minor. Doxycycline and Ethinyl estradiol-norgestimate have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Tetracyclines were thought to reduce oral contraceptive efficacy, but pharmacokinetic and clinical data do not show a consistent loss of protection. Any risk is considered very low.
How serious is the interaction between Doxycycline and Ethinyl estradiol-norgestimate?
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 routine backup method is required; reinforce adherence and advise backup if vomiting or diarrhea occurs.
What other medicines interact with Ethinyl estradiol-norgestimate?
MediHelp also lists interactions of Ethinyl estradiol-norgestimate with, for example, Fezolinetant, Ombitasvir / paritaprevir / ritonavir and dasabuvir, Tranexamic acid. The full list is on the Ethinyl estradiol-norgestimate page.
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