Nflox-TZ is a combination of an antibiotic and an antiprotozoal, primarily used to treat infectious diarrhea or food poisoning. It is not a general pain reliever and is not the correct medicine for a standard stomach ache unless a bacterial or parasitic infection is confirmed. Taking antibiotics unnecessarily can lead to side effects and antibiotic resistance. For general stomach pain, which could be due to acidity, gas, or spasms, an antacid or an antispasmodic would be more appropriate. Please stop taking Nflox-TZ and consult a doctor to get a proper diagnosis and the correct prescription.