If vomiting is a symptom of reye's syndrome, how long after taking aspirin would that start?

A few hours: Reyes syndrome is caused by aspirin intake by children And vomiting can start within a few hours.

Not likely: Reye's syndrome is generally considered a childhood disease. It comes from giving aspirin to a child during a viral infection. Unfortunately, most over-the-counter (OTC) analgesic medications have not been specifically approved for children and frequently carry warnings against using these drugs in children under 16 years of age. Take care.