<s>[INST] My doctor gave me z pack to treat an upper respiratory infection. I have not taken it yet because I am not convinced it is bacterial. I have terrible trouble with antibiotics so I dont take them unless it is a last resort. Well today is day five of low grade fever, and major coughing fits. The sputum is clear but the coughing is relentless. Should I start the drug and deal with the consequences or wait it out a few more days. Chest extra was clear, not the flu. Thank you [/INST] Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. Viral infection related fever is usually self limited and resolve within 3 days. Since you had fever for five days, it is probably of bacterial origin and requires an antibiotic. Hope I have answered your query. Let me know if I can assist you further. </s>