Interação entre Fluvoxamina e Tioridazina
Fluvoxamina e Tioridazina: ambas as bulas profissionais sinalizam esta combinação com a linguagem mais forte, como uma contraindicação, uma advertência em caixa preta ou uma instrução para evitá-la.
Não combine sem a orientação de um prescritor. A linguagem da bula abaixo é a mais forte que a FDA usa.
O que dizem as bulas da FDA
Da bula de Fluvoxamina (fluvoxamine maleate) · em vigor desde 2026-04-23
Coadministration Coadministration of tizanidine, thioridazine, alosetron, or pimozide with Fluvoxamine Maleate Tablets is contraindicated [see Warnings and Precautions ( 5.4 , 5.5 , 5.6 , 5.7 )] .
Coadministration of tizanidine, thioridazine, alosteron, pimozide ( 4 )
Thioridazine administration produces a dose-related prolongation of the QTc interval, which is associated with serious ventricular arrhythmias, such as torsades de pointes-type arrhythmias, and sudden death.
Therefore, fluvoxamine and thioridazine should not be coadministered [see Contraindications ( 4 )] .
Concentrations of thioridazine and its two active metabolites, mesoridazine and sulforidazine, increased threefold following coadministration of fluvoxamine.
Da bula de Tioridazina (Thioridazine Hydrochloride) · em vigor desde 2026-03-02
Reduced cytochrome P450 2D6 isozyme activity drugs that inhibit this isozyme (e.g., fluoxetine and paroxetine) and certain other drugs (e.g., fluvoxamine, propranolol, and pindolol) appear to appreciably inhibit the metabolism of thioridazine.
Fluvoxamine and thioridazine should not be coadministered.
Drug Interactions Reduced cytochrome P450 2D6 isozyme activity, drugs which inhibit this isozyme (e.g., fluoxetine and paroxetine), and certain other drugs (e.g., fluvoxamine, propranolol, and pindolol) appear to appreciably inhibit the metabolism of thioridazine.
Drugs That Reduce the Clearance of Thioridazine Through Other Mechanisms Fluvoxamine The effect of fluvoxamine (25 mg b.i.d. for one week) on thioridazine steady-state concentration was evaluated in ten male inpatients with schizophrenia.
Concentrations of thioridazine and its two active metabolites, mesoridazine and sulforidazine, increased 3-fold following coadministration of fluvoxamine.
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