The pharmaceutical company Pfizer hit the big time with Viagra (sildenafil citrate), finding what it proclaimed to be the cure for erectile dysfunction, a problem which may affect as many as 30 million Americans. The drug, administered in tablet form, essentially increases blood flow to the penis enabling a man to have an erection. By 2000, the drug had been prescribed to over 5 million men in the United States, and its use had spread worldwide. Part of its fame resulted from its stint as a staple for late-night comedy and also from former presidential candidate Robert Dole’s declaration that he benefited from the drug.