A decline in the sale of impotence drugs have been noticed as fewer men are willing to use the medications as the often televised commercials for the products have become less effective. Though the combined worldwide sales of the three erectile dysfunction (ED)drugs - Viagra, Cialis and Levitra has reached about US$2.5 billion ($3.5 billion) last year, the number of new prescriptions has declined this year, including a 10 per cent drop in October.

About half of men over the age of 40 may have mild or occasional impotence, yet only about 15 per cent of them get prescriptions for Viagra, Cialis or Levitra in a given year. On the other hand, the so-called recreational use of the drugs by younger men has increased over the period of time. According to research, the combined sales of Viagra, Cialis and Levitra amounted to $2.5 billion ($3.5 billion) last year.

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