<prompt> Floppy iris syndrome is associated with usage ofAnticholinergicsPDE- 5 inhibitorSelective alpha- adrenergic antagonist5 alpha reductase inhibitor  <response>: Selective alpha- adrenergic antagonist side effects may include hypotension, dizziness, nasal congestion, headache, and floppy iris syndrome. Ref Harrison 20th edi page no 2833 