Fluconazole Contraindications and Propranolol Coadministration
Fluconazole has contraindications related to hypersensitivity and specific interacting drugs that increase QT prolongation risk. [1] Fluconazole and propranolol do not have a listed contraindication in the fluconazole prescribing information. [1]
Absolute Contraindications for Fluconazole
Fluconazole is contraindicated in patients with hypersensitivity to fluconazole or any excipients. [1] Coadministration of fluconazole with terfenadine at fluconazole doses of 400 mg or higher is contraindicated. [1] Coadministration of fluconazole with other drugs known to prolong the QT interval and metabolized via CYP3A4 is contraindicated, including cisapride, astemizole, erythromycin, pimozide, and quinidine. [1]
QT Prolongation Warnings Relevant to Any Concomitant QT-Risk Drugs
Fluconazole is associated with QT interval prolongation and torsade de pointes reports in postmarketing surveillance. [1] Fluconazole should be used with caution in patients with potentially proarrhythmic conditions, such as structural heart disease and electrolyte abnormalities, and in the presence of concomitant medications that may contribute to risk. [1]
Specific Considerations for Fluconazole With Propranolol
No specific fluconazole contraindication is listed for propranolol in the prescribing information. [1] Concomitant use is clinically managed as a potential additive QT-risk issue only when other QT-prolonging agents or proarrhythmic risk factors are present, since fluconazole carries a QT prolongation warning. [1]
Clinical Checks Before Starting Fluconazole
Assessment for fluconazole hypersensitivity history is required prior to use. [1] Medication reconciliation is required to avoid contraindicated coadministration with QT-prolonging CYP3A4-metabolized agents. [1] Risk assessment for QT-related factors and correction of electrolyte abnormalities is recommended when fluconazole is used in patients at increased proarrhythmic risk. [1]
Pregnancy and Reproductive-Age Considerations
Fluconazole use in pregnancy is addressed in the labeling with limited human data and no clearly demonstrated increased risk after a single 150 mg dose, but use still requires clinical judgment. [1]