Tylenol (acetaminophen) does not usually cause drowsiness. However, some medications combine acetaminophen with other ingredients, such as codeine, which can make you sleepy. On its own, acetaminophen is not expected to have this effect.
Side effects from acetaminophen are considered rare, but they can include:
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Allergic reactions
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Redness of the skin
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Changes in blood test results, such as complete blood count or liver enzyme levels
If unwanted side effects occur while taking Tylenol, it is recommended to stop using the medication and consult a doctor. A healthcare provider can check if specific treatment is needed and whether another medication may be more appropriate.