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Anastrozole + Desogestrel-ethinyl estradiol

Gravità: Maggiore

Anastrozole and Desogestrel-ethinyl estradiol: major interaction.

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Sintesi

Anastrozole works by lowering estrogen levels, and exogenous estrogen such as ethinyl estradiol opposes this effect. The combination undermines the therapeutic aim in hormone-receptor-positive breast cancer, and anastrozole is not intended for use in premenopausal women who might need contraception.

Cosa significa questa interazione in parole semplici

Anastrozole and Desogestrel-ethinyl estradiol can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.

Anastrozole belongs to Oncology; Desogestrel-ethinyl estradiol belongs to Endocrine.

Livello di evidenza: Moderate

Perché avviene

Pharmacodynamic antagonism: exogenous estrogen counteracts aromatase inhibition-induced estrogen suppression.

Cosa fare

Avoid combined estrogen-containing products in patients taking anastrozole; use a non-hormonal contraceptive if contraception is needed.

Cosa chiedere al farmacista

  • Does the benefit of taking both outweigh the risk in my case?
  • Do I need any blood test, ECG or other check while on both?
  • What early warning signs should I watch for, and what should I do if they appear?

Bring a full list of your medicines, including over-the-counter products, supplements and herbal remedies, to every pharmacy visit.

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Domande frequenti

Can I take Anastrozole with Desogestrel-ethinyl estradiol?

MediHelp rates the interaction as major. Anastrozole and Desogestrel-ethinyl estradiol can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Anastrozole works by lowering estrogen levels, and exogenous estrogen such as ethinyl estradiol opposes this effect. The combination undermines the therapeutic aim in hormone-receptor-positive breast cancer, and anastrozole is not intended for use in premenopausal women who might need contraception.

How serious is the interaction between Anastrozole and Desogestrel-ethinyl estradiol?

MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid combined estrogen-containing products in patients taking anastrozole; use a non-hormonal contraceptive if contraception is needed.

What other medicines interact with Desogestrel-ethinyl estradiol?

MediHelp also lists interactions of Desogestrel-ethinyl estradiol with, for example, Fezolinetant, Aminocaproic acid, Amobarbital. The full list is on the Desogestrel-ethinyl estradiol page.

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