Interazioni tra farmaci
Estradiol + Fosphenytoin
Gravità: Maggiore
Estradiol and Fosphenytoin: major interaction.
Ultimo aggiornamento
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Sintesi
Phenytoin, the active metabolite of fosphenytoin, is a strong enzyme inducer that increases estradiol clearance and lowers its levels. This can cause loss of efficacy and breakthrough bleeding, and contraceptive failure has been reported with hormonal products.
Cosa significa questa interazione in parole semplici
Estradiol and Fosphenytoin 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.
Estradiol belongs to Endocrine; Fosphenytoin belongs to Central Nervous System.
Perché avviene
Induction of CYP3A4 and possibly P-glycoprotein by phenytoin, increasing estradiol metabolism.
Cosa fare
Use a non-hormonal or alternative contraceptive method when contraception is needed. For menopausal therapy, monitor for reduced effect and increase the estradiol dose if required.
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?
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Altre interazioni di Estradiol
- Anastrozole + Estradiol Controindicata
- Estradiol + Fezolinetant Controindicata
- Estradiol + Ospemifene Controindicata
- Antithrombin alfa + Estradiol Maggiore
- Antithrombin iii + Estradiol Maggiore
- Estradiol + Exemestane Maggiore
Altre interazioni di Fosphenytoin
- Dronedarone + Fosphenytoin Controindicata
- Fosphenytoin + Ledipasvir-sofosbuvir Controindicata
- Fosphenytoin + Lorlatinib Controindicata
- Fosphenytoin + Lurasidone Controindicata
- Fosphenytoin + Ranolazine Controindicata
- Fosphenytoin + Sofosbuvir-velpatasvir-voxilaprevir Controindicata
Domande frequenti
Can I take Estradiol with Fosphenytoin?
MediHelp rates the interaction as major. Estradiol and Fosphenytoin 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. Phenytoin, the active metabolite of fosphenytoin, is a strong enzyme inducer that increases estradiol clearance and lowers its levels. This can cause loss of efficacy and breakthrough bleeding, and contraceptive failure has been reported with hormonal products.
How serious is the interaction between Estradiol and Fosphenytoin?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Use a non-hormonal or alternative contraceptive method when contraception is needed. For menopausal therapy, monitor for reduced effect and increase the estradiol dose if required.
What other medicines interact with Estradiol?
MediHelp also lists interactions of Estradiol with, for example, Anastrozole, Fezolinetant, Ospemifene. The full list is on the Estradiol page.
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