Had viral and vomiting after Fluvir.

Hello doctor, My son is 6.5 year old and he had fever ans cold cough from past 4 days. We tried calpol and ibugesic and chericof but nothing worked. Today is 5th day and after doc recommendations we started antiviral "FLUVIR "...he is having severe cough. After morning dose he vomitted after 10 mins and after that he vomitted 3-4 times within 2 hr gap. In evening dose i gave him 6 ml in 2 parts (2.5ml and 3.5 ml) then he vomitted nearly after 25 mins of second dose... every-time he is vomitted all mucus along with food ... My concern is 1) what should i do in this case if he is continuously vomit after having FLUVIR . Dose recommendations- till 5 days , 2 times , 6ml each... Thanks in advance