“Viagra and two other popular impotence drugs may cause sudden blindness in one eye in rare cases, the [US] Food and Drug Administration said in a formal alert yesterday. [...] The condition, called non-arteritic anterior ischemic optic neuropathy (NAION), is caused by a blockage of blood to the optic nerve. [...] The FDA [...] had received 43 reports of NAION in men who had recently taken Viagra, Cialis or Levitra. The vision loss is generally not reversible.”
Is that what you call “hard luck”?