Answer :
Final answer:
The original purpose of ED drugs like sildenafil (Viagra) was to cure pain. Therefore, the correct option is 4.
Explanation:
Researching heart-related drugs revealed that sildenafil, which was first prescribed to treat angina (chest discomfort), has the unanticipated side effect of boosting erections in the penile region. The medication was repurposed to treat erectile dysfunction (ED) as a result of this discovery.
Consequently, the drugs used to treat erectile dysfunction were not originally intended for their widespread usage, but rather for a positive side effect that led to a revolution in the field. It is not correct to say that options 1 (erectile dysfunction), 2 (depression), and 3 (anxiety) represent the original intent of these drugs.
Therefore, the correct option is 4.
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