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2026-06-29 14:51:29 -

Why Sildenafil Can Tint Your World Blue: What One Strange Side Effect Reveals About How Drugs Work

One of the strangest and best-documented side effects of sildenafil is that it can briefly tint your vision blue. Objects take on a faint cool cast, lights seem brighter, colors shift slightly—and then, an hour or two later, it fades. It's usually harmless. But it's also a small, rather beautiful window into one of the deepest principles in all of pharmacology: a drug's side effects are...

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