06.23.2005, 10:32 AM
Vivus Inc., a maker of sexual dysfunction therapies, said Thursday that its experimental impotence drug helped more than half of men achieve erections within 30 minutes in a mid-stage trial, with the highest doses proving most effective.
The company's shares jumped 75 cents, or 22.5 percent, to $4.09 in morning trading on the Nasdaq.
The Avanafil drug is designed to be a fast-acting version of blood-flow boosting drugs called PDE5 inhibitors. These include Pfizer Inc.'s Viagra and Levitra, which GlaxoSmithKline PLC and Schering-Plough Corp. sell in the United States.
"The ability to initiate intercourse in 30 minutes, which is half the time as compared to the recommended initiation time of two of the currently approved PDE5 inhibitors, while maintaining a high degree of efficacy, should help differentiate Avanafil," said Dr. Joel Kaufman, one of the study researchers.
The 12-week study evaluated 284 men on varying doses of Vivus' Avanafil drug. The company said 64 percent of patients on the highest dose - 300 milligrams - achieved erections sufficient for successful intercourse, as compared with a placebo. About 84 percent of these patients had achieved erections sufficient for vaginal penetration. Somewhat fewer successful erections were recorded for patients on lower doses.
The drug was generally well-tolerated with some patients reporting headaches but no serious side effects. The company said there were no reports of visual problems, a growing concern for this class of drugs.
Vivus also noted that previous research has suggested that Avanafil can potentially be taken more than once a day.
The company's shares have traded as high as $6.37 within the past 52 weeks, but slumped as low as $2.25 in May and have been slowly edging back up.