My son aged 15 years is having diarhoea and...

Diarrhea treatment and and abdominal pain and blood in stools
There are many causes of diarrhea, between gastroenteritis, such as your case, and other pathological causes such as irritable bowel syndrome, ulcerative colitis, and some acute infections such as appendicitis and other causes.
Diarrhea can be treated with some antibiotics such as cefuroxime 500 mg twice daily for a week with zinc sulfite pills daily for five days with the use of anti-stomach colic such as anticholinergic such as Ascopetyl three pills daily for a week with good nutrition and avoiding oils and fatty foods with Plenty of liquid such as water and juices to prevent dehydration
What are the medical tests needed in cases of diarrhea?
A clinical medical examination with a specialized doctor to prevent dehydration, especially a skin examination so that the skin is pinched and returned after two seconds, in addition to a stool examination to exclude parasites and bacteria with a complete blood test (CBC) and to exclude evidence of infections in the body such as high white blood cells more than 12 thousand and also Knowing the percentage of body salts, such as 143 sodium and potassium 3.5, and also must know chloride and magnesium
What are the causes of diarrhea?
gastroenteritis
ulcerative colitis
worms
Other disease causes
My advice to the patient
The above medication must be adhered to