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As per the clinical history, the child suffers from infective gastroenteritis, also known as dysentery. This is diarrhea in children. A probable cause could be food poisoning or any infection. The medicines given by your pediatrician seem to be adequate.
I suggest you continue with the Norfagyl (Metronidazole and Norfloxacin). This is an antibiotic for both aerobic and nonaerobic infections. Zinc UP is zinc used to boost immunity and build gastric flora. Tufpro is a probiotic suspension. Probiotic has a very good role in controlling diarrhea by building gastric flora.
If Gifaxin (Rifaximin) is increasing the frequency of diarrhea, I suggest you may stop it, as it has a minimal role in acute gastroenteritis. Xpect PD (Terbutaline and Ambroxol) have been given for a normal cough and cold.
Keep rehydrating the child with ORS (oral rehydration salts) solution as needed. Consult your specialist doctor, discuss with him or her and take the above medicines with their consent. If there is any sign of dehydration like lethargy, low urine output, or not being able to accept orally, then you need to immediately admit the child to a hospital.
Investigations to be done include stool routine and culture, and CBC (complete blood count). Continue with the advised medication. It generally takes two to three days for dysentery to resolve.