<unk> (injection) is a neuroleptic medication and first-generation antihistamine that is FDA approved for the treatment of Amelioration of allergic reactions to blood or plasma and 
in anaphylaxis as an adjunct to epinephrine and other standard measures after the acute symptoms have been controlled.. There is a Black Box Warning for this drug as shown here.  Common adverse reactions include dermatitis, phototoxicity, urticaria, nausea, vomiting, xerostomia, central nervous system depression, dizziness, extrapyramidal disease, lowered convulsive threshold, sedated and somnolence.
Promethazine 
Naltrexone 
Phenelzine
Medazepam
Nabilone
Propiomazine
Nordazepam
Ketanserin