Thanks for posting your query.
Does your father has spasmodic abdominal pain/ loose watery stools/ constipation/ frequent urge to use washroom?
Does he has burning urination/ frequent urination/ fever?
With the available described symptoms, there could be possibility of cystitis
or gastrointestinal infection
Your father should go for urine routine & microscopy, complete blood count
and CT/ MRI scan of abdomen.
Treatment depends on exact diagnosis.
Meanwhile, your father should continue drotin and if condition won't improve then he should take tramadol
for relief of pain.
He should take plenty of water.
Dr. MAyank Bhargava