Tossex New Syrup contains codeine 10 mg and triprolidine 1.25 mg. It is a controlled cough medicine and should not be used for self‑treatment or chosen on your own. A chest cough with fever can be due to viral flu, acute bronchitis, pneumonia, or other medical conditions, and the right treatment depends on a proper medical evaluation of the cause. It is safer not to start this medicine without a doctor’s assessment, because cough suppressants may not be suitable in chest infections, and fever suggests an underlying infection that may need different management. You should consult a doctor for examination and appropriate treatment, especially if there is a high fever, breathing difficulty, chest pain, or worsening symptoms.

Stopping codeine may temporarily alter bowel function as your body readjusts, but it typically does not reduce intestinal absorption capacity. If your symptoms are severe or persistent and you are concerned about your gut health, please consult your doctor for a thorough assessment and appropriate treatment. Meanwhile, drink plenty of fluids, eat a balanced fibre-rich diet, and consider a probiotic.