VIAGRA
VIA THE NOSE
Two University of Kentucky College of Pharmacy faculty members
have developed a nasal drug delivery system for Viagra causing
the drug to work almost immediately after dosing.
One issue with the Viagra tablet is that it can take an hour or
more for the drug to take effect, said Lewis Dittert, Ph.D., professor
in the UK College of Pharmacy.
"If a man takes Viagra and gets no response, he may become
impatient and after 30 to 45 minutes be tempted to take one or
two more tablets, just as the first one is being absorbed," Dittert
said. "The result would be an overdose."
Dittert and Anwar Hussain, Ph.D., professor in the UK College
of Pharmacy, developed the nasal spray at their company, New Millennium
Pharmaceutical Research Inc. (NMPRI) located at Advanced Science
and Technology Commercialization Center (ASTeCC)on the UK campus.
The active ingredient in the Viagra tablet is poorly soluble in
water and becomes even less soluble when it reaches the small intestine
where it is absorbed by the blood, Dittert said.
The advantage of the intranasal route is the drug is transferred
directly into the blood without being exposed to the alkaline intestinal
fluids. UK researchers also have made the active ingredient into
an aqueous solution and made it soluble in water.
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