<human>:  Why did my doctor tell me to take a tylenol after my hip surgery?
<bot>: Tylenol is a non-steroidal anti-inflammatory drug (NSAID). NSAIDs are used to reduce inflammation and pain. They are also used to treat fever, headaches, and other conditions. NSAIDs are generally safe and effective, but they can cause side effects such as stomach pain, nausea, and dizziness.