Interações medicamentosas
Estradiol + Fosphenytoin
Gravidade: Grave
Estradiol and Fosphenytoin: major interaction.
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Resumo
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.
O que esta interação significa em palavras simples
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.
Por que acontece
Induction of CYP3A4 and possibly P-glycoprotein by phenytoin, increasing estradiol metabolism.
O que fazer
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.
O que perguntar ao farmacêutico
- 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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Outras interações de Estradiol
- Anastrozole + Estradiol Contraindicada
- Estradiol + Fezolinetant Contraindicada
- Estradiol + Ospemifene Contraindicada
- Antithrombin alfa + Estradiol Grave
- Antithrombin iii + Estradiol Grave
- Estradiol + Exemestane Grave
Outras interações de Fosphenytoin
- Dronedarone + Fosphenytoin Contraindicada
- Fosphenytoin + Ledipasvir-sofosbuvir Contraindicada
- Fosphenytoin + Lorlatinib Contraindicada
- Fosphenytoin + Lurasidone Contraindicada
- Fosphenytoin + Ranolazine Contraindicada
- Fosphenytoin + Sofosbuvir-velpatasvir-voxilaprevir Contraindicada
Perguntas frequentes
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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