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Eli Lilly is the manufacturer of Cialis (Tadalafil). Cialis has a big advantage over it’s two other competitors and it is a big one. The others last only about four hours after ingested but Cialis can brag about a whopping 36 hours of effective erection time. All erectile dysfunction drugs work from a process called a PDE5 enzyme inhibiter. In 1993 a drug company Icos began studies on the PDE5 enzyme inhibiter but in 1994one of Eli Lilly's fiercest competitors discovered that Sildenafil Citrate was responsible for heart patients getting erections during their studies. The testing was not being conducted for purposes of erectile dysfunction but rather for heart disorders. A year after that Pfizer came out with Viagra. prevacid 15 mg price prevacid soluble tablets prevacid soluble tablets prevacid solutab drug