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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.

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Thyroid conditions may make getting pregnant impossible.

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Drug-induced pharmacodynamic effects manifested in older adults include drug-induced renal toxicity, which can be a major factor when these adults are experiencing other kidney problems.

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The human body produces and destroys 15 million blood cells every second.

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The FDA recognizes 118 routes of administration.

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