Drugs can be given via a variety of routes. A choice of a specific route is determined by the following factors:
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* the properties of the drug
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* the therapeutic objective (eg speed on onset, length of duration)
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* administration or restriction to a local site
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Some of the route options are: oral, rectal, intravenous, intramuscular, sub-cutaneous, intra-articular, inhalation, transdermal patches, topical (eye, ear and nose drops), intramammary, intravaginal, epidural and sub-conjunctival.
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'''Intravenous injections''' have the highest peak plasma concentrations after administration.