Is It Safe To Give Pedialyte For Diarrhea And Stomach Gurgling For 3 Year Old?

MY GRANDSON IS 3 YEARS OLD AND FOR A WEEK HE IS BEEN HAVING DIARHEA ON AND OFF AND HIS STOMACH MAKE GROULING NOISES BUT NO FEVER OR TROW UPS. WE GIVE HIM ONLY PEDIALYTE TO HIDRATE HIM BUT NOTHING ELSE. IS THERE ANY OVER THE COUNTER MEDICINE I CAN GIVE HIM ? PLEASE ADVISE THANK YOU