As if erectile dysfunction were not harrowing enough. In March 2016 a published study concluded that the use of the drug sildenafil (Viagra), vardenafil (Levitra), and tadalafil (Cialis) “could promote melanoma in humans.”
As you probably know, melanoma is the most aggressive and most dangerous form of skin cancer. Melanoma develops when damage to skin cells (usually caused by ultraviolet radiation from sunshine or tanning beds) triggers mutations that lead the skin cells to multiply rapidly and form malignant tumors. Most people think of melanoma as dark, asymmetrical moles, and in fact melanoma can develop from existing moles, but melanoma can also form directly on the skin. Melanoma is often caused by intense, sustained exposure to ultraviolet light, the kind which causes suntans and sunburns. Melanoma has been estimated to cause over 10,000 deaths in the United States each year.
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