<unk>  is an over-the-counter antihistamine with anticholinergic properties. It is used to combat the symptoms associated with allergies and is sometimes combined with other cold medications designed to provide general relief for flu-like symptoms. As with many antihistamines, the most common side effect is drowsiness. It was patented in 1948 and came into medical use in 1953.
Triprolidine
Bromelain 
Ibogaine
Ropivacaine
Diphenylpyraline
Noribogaine
Proxymetacaine
Aceclidine