<unk> (rectal) is a phenothiazine derivative that is FDA approved for the treatment of perennial and seasonal allergic rhinitis.. There is a Black Box Warning for this drug as shown here.  Common adverse reactions include dermatitis, phototoxicity, urticaria, nausea, vomiting, xerostomia, CNS depression, dizziness, extrapyramidal disease, lowered convulsive threshold, sedation and somnolence..
Promethazine 
Naltrexone 
Phenelzine
Medazepam
Nabilone
Propiomazine
Nordazepam
Ketanserin