Common colds are usually viral, meaning antibiotics like cefuroxime will not cure them unless a secondary bacterial infection is present. Please consult your prescribing doctor before stopping your antibiotic. For symptomatic relief, you can take paracetamol to manage the chills and body aches. If your cough is wet, an expectorant containing guaifenesin or ambroxol may be more effective than levocloperastine (your current cough syrup, which is a suppressant). Ensure you stay well-hydrated, try steam inhalation, and get plenty of rest. Please visit a healthcare professional for a physical evaluation to ensure you receive the correct targeted treatment.