<unk>  is an opioid antagonist that is FDA approved for the treatment of opioid-induced constipation (OIC) in adult patients with chronic non‑cancer pain and  with advanced illness who are receiving palliative care, when response to laxative therapy has not been sufficient.   Common adverse reactions include abdominal pain, nausea, diarrhea, hyperhidrosis, hot flush, tremor, chills,flatulence, and dizziness.
Methylnaltrexone bromide
Clebopride
Pantethine
Dropropizine
Demecarium bromide
Methoxyphedrine
Tritoqualine
Methaqualone