Can Taking Acitorm For Prostate Cancer Cause Stomach Pain?

my father aged 88 years is diagonised with atrial fibralation and given medications of tab.cardarone, tab acitrom.since he is under cathedral form urinary bladder due prostrate enlargement, he is on tab.dilzem sr and veltam plus .he complains of stomach pain if tab acitorm is taken.pls let us know if it triggers gas.thks prasanna