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Remember that when you swallow something, it enters the digestive system where it is subjected to stomach acid, digestive enzymes, and various digestive processes designed to break it down into easily absorbed, simple chemicals. If you want a drug to remain intact and unchanged, then swallowing is not the best idea. Inhaling is often a bad idea as well, since the lungs or sinuses may become irritated by foreign substances that you inhale. So we are left with intravenous administration.

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