Vomitting medicine. For ampoxin?

My daughter is 2.5 yrs old and the moment we started on a road trip due to an emergency, she started vomitting . She vomitted whatever we gave to her . At night when we gave her rice and potato , she did not vomit and was her cheerful self .The next day when we started travelling she vomitted thrice by 10 am , called up a doctor who said to give injection perinorm .5 ml , syrup ondem 5 ml , tab junior lanzol 15 mg once a day and Ampoxin syrup 5 ml a three times a day . I have the following concerns : The doctor prescribed 5 ml dose of ondem ... is it too much ? I have been giving her .5 ml by mistake and her vomitting stopped after the first dose ... Do I still need to get her injected She just had 1/2 banana and ors water . Any substitute for Ampoxin ?