It can be a form of either topical administration or systemic administration, as the drugs thus locally delivered can go on to have either purely local or systemic effects. Nasal sprays or drops are locally acting drugs such as decongestants for cold and allergy treatment, whose systemic effects are usually minimal. Examples of systemically active drugs available as nasal sprays & drops are migraine drugs, rescue medications for seizure emergencies, nicotine replacement medication, and hormone treatments.
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