It has a very characteristic indication for its administration, viz.: "Great and sudden desire to urinate," children stand and jump right up and down from pain and urging. This is mostly found in chronic cases (especially after gonorrha) after the inflammation has extended backward to the neck of the bladder. Another very troublesome symptom found under Petroselinum is itching in the urethra; feels as if he must run a stick or something in there and scratch it. Burning, tingling, from perinæum throughout whole urethra. Children are sometimes troubled with such sudden and intense desire to urinate that they will jump right up and down, trying to hold on until their clothes are unbuttoned. It is like the sudden desire for stool of Aloe -"must git thar."
Maharana Homoeo Reader