Despite its beneficial effect, ureteral stents may produce symptoms (such as hematuria, dysuria, frequency, urgency, urge incontinence and suprapubic or flank pain) that affect the quality of life in 70-80%.

This study will be conducted to evaluate the role of Phosphodiestrase 5 inhibitor (Sildenafil Citrate) in relieving these symptoms.

Adult patient (>18 years) who will undergo ureteral stent fixation after endoscopic procedures will be randomized between the study arms.

Exclusion criteria:

1. Patients who had lower urinary tract symptoms before stent fixation.
2. Ureteral stent fixation after open surgery.
3. Known contraindications to Sildenafil Citrate

Inclusion Criteria:

1. Patient aged >18 years

Exclusion Criteria:

1. Patients who had LUTS before DJ stent fixation
2. DJ stent fixation after open surgery
3. Contraindication to Sildenafil citrate