A member asked:

What are the effects of caffeine and aspirin on avid runners?

A doctor has provided 1 answer

Aspirin side effects: Caffeine shouldn't have significant adverse effects beyond insomnia if taken within a few hours of try to sleep. Aspirin when used intermittently in adults also shouldn't be a problem. When used chronically it can put you at increased risk for bleeding and high doses can be toxic. Follow the package labeling to be safe.

Answered 5/16/2017

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