Viagra and melanoma: a lifestyle issue?

Increased risk of malignant melanoma link to ED drugs likely due to greater sun exposure, researchers say A newly published study of nearly 150,000 men prescribed sildenafil, tadalafil, or vardenafil has found a slight increase in risk of malignant melanoma compared with 560,000 controls. The three erectile dysfunction drugs are known to inhibit the enzyme phosphodiesterase type