The SUSPEND (Spontaneous Urinary Stone Passage ENabled by Drugs) trial is a multicentre,
double-blind, randomized controlled trial evaluating two medical expulsive therapy strategies (nifedipine or tamsulosin)
versus placebo.
Patients aged 18 to 65 with a ureteric stone confirmed by non-contrast computed tomography of the kidney, ureter
and bladder will be randomized to receive nifedipine, tamsulosin or placebo (400 participants per arm) for a maximum
of 28 days. The primary clinical outcome is spontaneous passage of ureteric stones at 4 weeks