Excess Gas In Da Stomach

hi doctors in d house

complain from my collegae in my office, just wondering if nl will help with advise or sometin
my co worker is taking antibiotics for quite sometime now and recently,he observed that, he fart most time he is urininating or going to d toilet

is it the drug or what, is there any problem with his digestive system?

just farting if he wish cos there is alot of gas that needs to come out, why?

is it normal and most of all, sound from dis stomach?

and health problem with him