Zafirlukast is used by patients with mild-to-moderate asthma to decrease the symptoms of asthma and the number of acute asthma attacks. It is not a "rescue" medicine.

Zaleplon is a central nervous system depressant used to treat insomnia.

Medication for influenza, marketed by Glaxo Wellcome under the name Relenza.

Zileuton is an orally active inhibitor of 5-lipoxygenase, the enzyme that catalyzes the formation of leukotrienes from arachidonic acid. It is indicated for the prophylaxis and chronic treatment of asthma in adults and children 12 years of age and older.

Ziprasidone hydrochloride is an atypical antipsychotic medication, marketed in the United States as Geodon.

Zoledronic acid is an intravenous (IV) bisphosphonate for the treatment of hypercalcemia of malignancy (HCM) providing a higher response rate compared to pamidronate disodium.

Zolmitriptan is used to treat severe migraine headaches.

Zolpidem is a central nervous system depressant that is used to treat insomnia.

An antiseizure drug chemically classified as a sulfonamide and unrelated to other antiseizure agents.

Antipsychotic drug.