Yes, You can take O2 tablets (2-3 for an adult) for loose motions or infection in stomach, Ive been taking it for so many years.......... Though my friend recommended it for bad reasons like he said I u have to go to a party in the evening and ur stomach is upset .... then he would call me and suggest me to take a tablet of "O2" (In which Ofloxacin 200 and Ornidazole 500) mg ..... but it really worked for me and also as I drink every alternate day , so if I eat eat badly some day with whisky then next day having a dose with a cup of tea (or coffee) with rusk or glucose biscuits would gimme the utmost rest (to my liver and whole body)......
Though, it doesnt apply to everyone but I usually have if my stomach is upset before a big party.... I always worked for me.... but if after 2 dose a day doesnt solve it... then u shuld contact ur Doctor for sure.........
"O2" is usually meant to eradicate bacterial infection of stomach/intestinal infection ..............