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Drug Side Effects

Access detailed side effect information for thousands of prescription and over-the-counter medications, from common mild reactions to rare severe effects.

Note: Medication side effects may be underreported. Always consult your healthcare provider for medical advice. Suspected adverse events can be reported to the FDA at www.fda.gov/safety or 1-800-FDA-1088.

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Information about drug side effects

A side effect is usually regarded as an undesirable secondary effect which occurs in addition to the desired therapeutic effect of a drug or medication. Side effects may vary for each individual depending on the person's disease state, age, weight, gender, ethnicity and general health.

Side effects can occur when commencing, decreasing/increasing dosages, or ending a drug or medication regimen. Side effects may also lead to non-compliance with prescribed treatment. When side effects of a drug or medication are severe, the dosage may be adjusted or a second medication may be prescribed. Lifestyle or dietary changes may also help to minimize side effects.

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