Many films have portrayed mental disorders or used them as backdrops for other themes. This is a list of some of those films, sorted by disorder, regardless of whether or not the disorder is portrayed accurately. Thus, though 50 First Dates presents a case of anterograde amnesia, the type depicted does not really exist.
In particular, owing to the nature of drama, extreme and florid manifestations of any given disorder tend to prevail over the more subtle ones typical of the average case. For example, people with agoraphobia are generally portrayed in drama as recluses who never, or almost never, venture from their homes; in reality this is rare and extreme, not typical of the agoraphobic population.
A person with anterograde amnesia is unable to form new memories.
"A much-used plot device, retrograde amnesia occurs when a person forgets part or all of his or her past."
"Psychogenic amnesia, also known as dissociative amnesia, is memory loss caused by psychological stress."
Lacunar amnesia is the loss of memory about one specific event.
See also psychogenic amnesia (dissociative amnesia)
"Drugs listed from most addictive, harmful or destructive to least (from most to least dangerous, based on a 2007 scientific research study."