A patient was treated with amitriptyline for depression, developed urinary retention, constipation & blurring of vision. The most likely cause is -
Amitriptyline and other TCAs produce anticholinergic side effects which are manifested as dry mouth (↓ salivation) blurred vision, urinary retention, constipation, decreased sweating.
Symptoms of depression persisting
Anticholinergic side effects
Depression medicamentosa
Any of above