Hi Doc, I Went To The Hospital To See A

Hi doc, I went to the hospital to see a doctor 2 months ago coz I always got clogged nose and runny nose then coughing. I don't have that yellow color phlegm it's only mucus. Then the doctor let me take cefuroxime 500g 2/day for 7 days, levocetrizine 1 tablet per day for 10 days and fluimucil 600g once a day for 5 days. Just one take of cefuroxime really feels me better. I can breath well and no more pain on my knees and bones. But now my clogged nose is back and can't breath well again. Is it okay to buy and take the medicine that the doctor gave me before? It's expensive always going back to the doctor. Thank you