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I found an interesting article while searching for an answer to your question (I have not found the medicine yet). You may find some interest in this article however:

Did you know that common over-the-counter drugs or prescriptions can cause memory loss and cognitive impairment?

Mild cognitive impairment is a common, age-linked condition that is often an early sign of Alzheimer's disease. Its cardinal symptom is forgetfulness or impairment of short-term memory.

Numerous drugs have been shown to produce mild cognitive impairment (MCI). They may create or aggravate Alzheimer's-type symptoms.

(NOTE: You should NOT stop taking medications without first consulting your physician.)

Read more >> http://www.huffingtonpost.com/leo-galland-md/memory-loss-drugs-_b_822245.html 

Paranoia !! See a Doctor first.