A member of my family, aged between 60-70, have been diagnosed with colon cancer stage 0 eight months ago. They've been on chemo treatment and it going well so far until they had them to take xeloda; they started vomiting more than once in 24 hours so they stopped taking it. but the vomiting still happening even though they took medication to help stop vomiting.

Is this normal side effects of the drug?