Adverse effects caused by naproxen mostly occur in the gastrointestinal tract and central nervous system, and they are usually dose-dependent. Terms and frequencies of adverse effects are determined as follows: Very common: R ≥1/10; Common: 1/10 >R ≥1/100; Uncommon: 1/100 >R ≥1/1,000; Rare: 1/1,000 >R ≥1/10,000; Very rare: R <1/10,000; Not known: Cannot be estimated from the available data. (See Table 2.)
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Immediately notify a doctor or pharmacist of any adverse reactions that may be encountered when using the drug.