Floppy iris syndrome is associated with usage of
Selective alpha- adrenergic antagonist side effects may include hypotension, dizziness, nasal congestion, headache, and floppy iris syndrome. Ref Harrison 20th edi page no 2833
Anticholinergics
PDE- 5 inhibitor
Selective alpha- adrenergic antagonist
5 alpha reductase inhibitor
C.N.S