###Human: Is it advisable to take CoAmoxiclav for 14 days to cure tonsillitis? ###Assistant: Hello. The yellow phlegm itself shows your suffering from a secondary bacterial infection. If sputum is there then it may be originating from lower respiratory or sinuses. So that is why your doctor has adviced two weeks course of antibiotics. So please continue above medications. If no improvement, get it done- a chest X-ray and X-ray PNS, then we come to know where the source of infection is. Take care.