But the Spice must flow!
/cdn.vox-cdn.com/uploads/chorus_image/image/70038142/7558c8eb_a858_4cb7_b7d8_3ba8978f1c01_paul_dune_1984_finale.0.jpeg)
In rare cases, users may experience an odd side effect: changes in eyesight, including blue-tinted vision, that last for several weeks. The report, published Feb. 7, 2020 in the journal Frontiers in Neurology, describes the cases of 17 men who visited a hospital in Turkey with vision problems that persisted for more than 24 hours after they'd taken sildenafil.The problems reported included blurred vision, sensitivity to light, reduced eyesight and changes to color perception, including "intensely blue-colored vision," a side effect known as cyanopsia. Those with cyanopsia also reported "red-green colorblindness," in which red and green hues appear to be brownish, the report said. None of the patients had a history of eye disease or colorblindness.
While it's known that sildenafil can cause temporary vision changes, including blurred vision and cyanopsia, these side effects typically disappear within 3 to 5 hours. Persistent vision changes, like those seen in this report, are much rarer. Fortunately, the vision problems for all of the men described in this report went away after 21 days.
But the Spice must flow!