Side effects are any undesired actions or effects of a drug or treatment. Negative or adverse effects may include headache, nausea, hair loss, skin irritation, or other physical problems. Experimental drugs must be evaluated for both immediate and long-term side effects.
We sometimes discuss potential side effects when discussing Migraine and headache medications -- prescription AND over-the-counter, dietary supplements, and other treatments.
You can read more about potential side effects of Migraine and headache medications in these sections of our site:
For more terms, see our Migraine and Headache Glossary.
Medical review by John Claude Krusz, PhD, MD.