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Previous SectionNext Section That's one argument doctors may bring up if drug companies ever lobby to make erectile dysfunction drugs available over the counter. Impotence isn't a problem that exists in a vacuum; and although the drugs to treat it appear to be safe for most men, doctors believe they need to keep a close eye on those who are taking them. where to buy viagra viagra no prescription online Five of seven of the rats that received nanoparticles with nitric oxide and all 11 rats that received nanoparticles with nitric oxide and either silorphin or tadalafil showed significant improvements in erectile function. Cyclic nucleotide phosphodiesterases (PDEs) are enzymes that regulate the cellular levels of the second messengers, cAMP and cGMP, by controlling their rates of degradation. There are 11 different PDE families, with each family typically having several different isoforms and splice variants. These unique PDEs differ in their three-dimensional structure, kinetic properties, modes of regulation, intracellular localization, cellular expression, and inhibitor sensitivities. Current data suggest that individual isozymes modulate distinct regulatory pathways in the cell. These properties therefore offer the opportunity for selectively targeting specific PDEs for treatment of specific disease states. The feasibility of these enzymes as drug targets is exemplified by the commercial and clinical successes of the erectile dysfunction drugs, sildenafil (Viagra), tadalafil (Cialis), and vardenafil (Levitra). PDE inhibitors are also currently available or in development for treatment of a variety of other pathological conditions. In this review the basic biochemical properties, cellular regulation, expression patterns, and physiological functions of the different PDE isoforms will be discussed. How these properties relate to the current and future development of PDE inhibitors as pharmacological agents is especially considered. PDEs hold great promise as drug targets and recent research advances make this an exciting time for the field of PDE research. Psychological Conditions best drugstore where you can buy viagra 100mg viagra online without prescription