Due to Needles size, expense, and inability to lessen pain and harm, they have not made much of an impact. To passively distribute medications through the skin, transdermal patches have also been produced, however, this method has only been applied to hydrophobic and tiny compounds. To improve the permeability of skin for protein and vaccination patches, various skin preparation techniques are being studied, including ultrasound, electric fields, solid microneedles, and thermal ablation. The systemic distribution of substances that traditionally need injections is increasingly being researched using novel strategies, including as pulmonary, oral, and nasal delivery routes.
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