Depends: If you took 20 600 mg Ibuprofen doses over a week or two then there most likely wouldn't be any long term effects. If you are talking about taking 20 of them all at once there might be some adverse gastrointestinal effects. Long term effects of chronic use of nsaids like Ibuprofen include gastrointestinal bleeding, kidney failure, and increased cardiovascular risk.
Answered 2/9/2016
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