Never attempt to clear a urinary blockage at home — this requires immediate veterinary care. If your veterinarian determines your cat is blocked, they may recommend some of the following:
Sedation or anesthesia for the cat's comfort.
Urinary catheterization to relieve the blockage and drain the bladder.
IV fluid therapy to flush toxins and rehydrate.
Bloodwork monitoring to check kidney function and electrolyte levels.
Hospitalization — your veterinarian will determine length of stay.