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U.S. Department of Health and Human Services

Safety

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Rapaflo (silodosin) capsules

Detailed View: Safety Labeling Changes Approved By FDA Center for Drug Evaluation and Research (CDER) – March 2010

 

Summary View

 

WARNINGS AND PRECAUTIONS

Pharmacodynamic Drug-Drug Interactions
  • Caution is also advised when alpha-adrenergic blocking agents including RAPAFLO are coadministered with PDE5 inhibitors. Alpha-adrenergic blockers and PDE5 inhibitors are both vasodilators that can lower blood pressure. Concomitant use of these two drug classes can potentially cause symptomatic hypotension

DRUG INTERACTIONS

PDE5 Inhibitors
  • Co-administration of Rapaflo with a single dose of 100 mg sildenafil or 20 mg tadalafil was evaluated in a placebo-controlled clinical study that included 24 healthy male subjects, 45 to 78 years of age. Orthostatic vital signs were monitored in the 12-hour period following
    concomitant dosing. During this period, the total number of positive orthostatic test results was greater in the group receiving Rapaflo plus a PDE5 inhibitor compared with Rapaflo alone. No events of symptomatic orthostasis or dizziness were reported in subjects receiving Rapaflo with a PDE5 inhibitor.
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