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Explained in plain English

What is a 'definitive link'?

When a drug is 'definitively linked' to a side effect, it means there's strong scientific evidence proving the drug caused it, not just that it happened after taking the drug. This often requires extensive research and analysis of many cases, ruling out other possible causes. The Viagra reports are currently suspected, not proven.

Stories that explain this

Viagra users report over a thousand side effects including deafness and blindness

Related explainers

How common are drug side effects? How do drugs cause side effects? Who tracks drug side effects? Debt vs. GDP: What's the link? Global economy's fragile links Global warming link Why link jobs to mental health? Why link sale to survival?

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