Next steps should include a clinical trial for the drug in patients considered at high risk of colorectal cancer, such as those with a strong family history, multiple previous polyps and chronic intestil inflammation like colitis, said corresponding author of the study Darren Browning from the Medical College of Georgia at the Augusta University. Viagra has been used safely for years in a wide range of doses and age groups, from premature infants with pulmory hypertension to the elderly with erectile dysfunction, he noted. When placed in the drinking water, the researchers found that Viagra reduced polyps in a mouse model with a genetic mutation that occurs in humans, causing them to produce hundreds of polyps starting as teegers and essentially always resulting in colorectal cancer. “Giving a baby dose of Viagra can reduce the amount of tumours in these animals by half,” Browning said.