Amnesia is a loss of memory caused by brain damage, disease, psychological trauma, various sedative and hypnotic drugs. Amnesia can be either whole or partial loss of memory There are two main parts of amnesia, retrograde amnesia and anteretrograde amnesia. Retrograde amnesia is inability to return memories from the date of an accident or operation. Anteretrograte amnesia is inability to remember things for long periods of time.
There are no medication to treat amnesia. The only way to treat it is by talking to a therapist to retrieve some of the memories or train your memory not to forget any thing else, and take in new information on top of intact memories.