<unk>  is a antiflatulent, diagnostic and gastrointestinal agent that is FDA approved for the treatment of excessive upper gastrointestinal gas.   Common adverse reactions include darrhea, nausea, regurgitation and vomiting.
Simethicone
Tolmetin
Mersalyl acid
Ethacizine
Misoprostol
Magnesium hydroxide
Prochlorperazine 
Guanoclor