med·i·ca·tion / ˌmedəˈkāshən/ • n. a substance used for medical treatment, esp. a medicine or drug: he'd been taking medication for depression | certain medications can cause dizziness. ∎  treatment using drugs: chronic gastrointestinal symptoms which may require prolonged medication.

medication (med-i-kay-shŏn) n.
1. a substance administered by mouth, applied to the body, or introduced into the body for the purpose of treatment. See also premedication.

2. treatment of a patient using drugs.