You can use mouthwash. Any.or else chlohex plus mouthwash rinse two times daily for 15 days. And if possible kindly clean your tongue daily. As it harbours loads of bacteria./ or any other fungal problem. There are as such no tablets available. Except if the person ha's oral thrush
/ candida sis. Kindly visit dentist
for any symptoms like that. Rest if you have any stomach problem. Like gastric kindly visit a physicIan or an ENT.