The most interesting aspect of medicinal drugs is that they can be administered through different routes by using varied delivery techniques. The common routes of drug administration include oral, inhalational, intramuscular, intravenous, sublingual, topical, and per-rectal. For a single route, there may be different delivery systems. For instance, the same drug can be administered orally in the form of tablets, syrups or capsules. After entering the human body, the drug has to reach its site of action to generate the therapeutic response.
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