Abstract
Drug-induced ototoxicity, particularly those involving phosphodiesterase type 5 (PDE-5) inhibitors, is considered to be rare and to our knowledge such an adverse effect has not been reported in Canada. Here we present a case of a 77-year old man initiated on a sildenfil regimen for the treatment of pulmonary hypertension, who developed sudden bilateral hearing loss after taking sildenafil, in the setting of high dose furosemide and diltiazem. We outline the likely interplay of patient characteristics, drug synergy and drug-drug interactions in the development of his ototoxicity. Importantly, given the extent and popularity of PDE-5 inhibitors for erectile dysfunction as well as a newer therapeutic option for pulmonary hypertension, clinicians should be aware of the risk for drug-induced ototoxicity, particularly in the setting of concomitant loop diuretics and CYP3A4 inhibiting medications.
MeSH terms
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Aged
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Canada
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Cytochrome P-450 CYP3A
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Cytochrome P-450 CYP3A Inhibitors
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Diltiazem / administration & dosage
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Diltiazem / therapeutic use
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Diuretics / administration & dosage
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Diuretics / adverse effects
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Diuretics / therapeutic use
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Dose-Response Relationship, Drug
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Drug Interactions
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Drug Synergism
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Enzyme Inhibitors / administration & dosage
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Enzyme Inhibitors / adverse effects
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Enzyme Inhibitors / therapeutic use
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Furosemide / administration & dosage
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Furosemide / adverse effects*
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Furosemide / therapeutic use
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Hearing Loss / chemically induced*
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Humans
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Hypertension, Pulmonary / drug therapy
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Male
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Phosphodiesterase 5 Inhibitors / administration & dosage
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Phosphodiesterase 5 Inhibitors / adverse effects
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Phosphodiesterase 5 Inhibitors / therapeutic use
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Piperazines / administration & dosage
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Piperazines / adverse effects*
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Piperazines / therapeutic use
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Purines / administration & dosage
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Purines / adverse effects
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Purines / therapeutic use
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Sildenafil Citrate
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Sulfones / administration & dosage
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Sulfones / adverse effects*
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Sulfones / therapeutic use
Substances
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Cytochrome P-450 CYP3A Inhibitors
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Diuretics
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Enzyme Inhibitors
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Phosphodiesterase 5 Inhibitors
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Piperazines
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Purines
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Sulfones
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Furosemide
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Sildenafil Citrate
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Cytochrome P-450 CYP3A
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CYP3A4 protein, human
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Diltiazem