<unk>  is a neurotransmitter agent that is FDA approved for the treatment of smoking cessation. There is a Black Box Warning for this drug as shown here.  Common adverse reactions include nausea, abnormal (e.g., vivid, unusual, or strange) dreams, constipation, flatulence, and vomiting.
Varenicline
Vernakalant
Suvorexant
Icatibant
Patiromer
Tasimelteon
Cimetropium bromide
Atogepant