Vahlania has started on antibiotics and will be for the next 4 weeks, but every time she has it she power chucks. why?

Which medication: You did not tell us which antibiotic she is taking. Many antibiotics have potential to cause GI upset. Does she take the medication with food? If she vomits after every dose, please let her prescribing medical provider know. Sometimes the medication can be changed or it's vehicle for delivery. Take care.

Antibiotic effect: Gastrointestinal (gut upset) is a common side effect of antibiotics. May need to either see the GP or the doctor who prescribed the antibiotic to see if there is an alternative. Unusual for patient to need such a prolonged course although there are a few rare but serious infections where this may be needed. Perhaps also discuss whether course needs to be this long given side effects.