{"id":210206,"date":"2025-04-30T06:35:50","date_gmt":"2025-04-30T06:35:50","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=210206"},"modified":"2025-04-30T06:35:52","modified_gmt":"2025-04-30T06:35:52","slug":"the-adult-dosage-of-diphenhydramine-an-antihistamine-is-50-0-mg","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/04\/30\/the-adult-dosage-of-diphenhydramine-an-antihistamine-is-50-0-mg\/","title":{"rendered":"The adult dosage of diphenhydramine, an antihistamine, is 50.0 mg."},"content":{"rendered":"\n

The adult dosage of diphenhydramine, an antihistamine, is 50.0 mg. A 21 lb child should only receive 20.0% of the adult dose. Calculate this dose in milligrams. Enter the dose numerically – NO UNITS (provided): mg Use your answer to solve the next part: liquid diphenhydramine comes in a concentration of 12.5 mg per 5.00 mL. How many milliliters of diphenhydramine should be administered to the child? Enter the dose numerically – NO UNITS (provided): mL Pay attention to significant figures.<\/p>\n\n\n\n

The Correct Answer and Explanation is:<\/mark><\/strong><\/p>\n\n\n\n

Correct Answers:<\/strong><\/h3>\n\n\n\n
    \n
  1. Milligrams for child:<\/strong> 10.0<\/code><\/li>\n\n\n\n
  2. Milliliters to administer:<\/strong> 4.00<\/code><\/li>\n<\/ol>\n\n\n\n
    \n\n\n\n

    Step-by-Step Explanation:<\/strong><\/h3>\n\n\n\n

    This problem involves a two-part dosage calculation using proportions and significant figures. Let\u2019s go through each step in detail.<\/p>\n\n\n\n

    \n\n\n\n

    Part 1: Calculating the Child’s Dose in Milligrams<\/strong><\/h3>\n\n\n\n

    Given:<\/strong><\/p>\n\n\n\n

      \n
    • Adult dose of diphenhydramine = 50.0 mg<\/li>\n\n\n\n
    • Child should receive 20.0% of adult dose<\/li>\n<\/ul>\n\n\n\n

      Calculation:<\/strong> Child\u2019s dose=20.0%\u00d750.0\u2009mg=(20.0100)\u00d750.0\u2009mg=0.200\u00d750.0=10.0\u2009mg\\text{Child’s dose} = 20.0\\% \\times 50.0\\, \\text{mg} = \\left( \\frac{20.0}{100} \\right) \\times 50.0\\, \\text{mg} = 0.200 \\times 50.0 = 10.0\\, \\text{mg}Child\u2019s dose=20.0%\u00d750.0mg=(10020.0\u200b)\u00d750.0mg=0.200\u00d750.0=10.0mg<\/p>\n\n\n\n

      Significant Figures:<\/strong><\/p>\n\n\n\n

        \n
      • The percentage (20.0%) has 3 significant figures<\/li>\n\n\n\n
      • The adult dose (50.0 mg) also has 3 significant figures<\/li>\n\n\n\n
      • Final answer: 10.0 mg<\/strong> (3 significant figures)<\/li>\n<\/ul>\n\n\n\n
        \n\n\n\n

        Part 2: Converting the Milligram Dose to Milliliters<\/strong><\/h3>\n\n\n\n

        Given:<\/strong><\/p>\n\n\n\n

          \n
        • Concentration: 12.5 mg per 5.00 mL<\/li>\n\n\n\n
        • Dose needed: 10.0 mg<\/li>\n<\/ul>\n\n\n\n

          We use a proportion to find the volume: 12.5\u2009mg5.00\u2009mL=10.0\u2009mgx\u2009mL\\frac{12.5\\, \\text{mg}}{5.00\\, \\text{mL}} = \\frac{10.0\\, \\text{mg}}{x\\, \\text{mL}}5.00mL12.5mg\u200b=xmL10.0mg\u200b<\/p>\n\n\n\n

          Cross-multiplying: 12.5x=10.0\u00d75.00=50.0\u21d2x=50.012.5=4.00\u2009mL12.5x = 10.0 \\times 5.00 = 50.0 \\Rightarrow x = \\frac{50.0}{12.5} = 4.00\\, \\text{mL}12.5x=10.0\u00d75.00=50.0\u21d2x=12.550.0\u200b=4.00mL<\/p>\n\n\n\n

          Significant Figures:<\/strong><\/p>\n\n\n\n

            \n
          • 10.0 mg \u2192 3 significant figures<\/li>\n\n\n\n
          • 12.5 mg \u2192 3 significant figures<\/li>\n\n\n\n
          • 5.00 mL \u2192 3 significant figures<\/li>\n\n\n\n
          • Final answer: 4.00 mL<\/strong> (3 significant figures)<\/li>\n<\/ul>\n\n\n\n
            \n\n\n\n

            Summary:<\/strong><\/h3>\n\n\n\n
              \n
            • The child\u2019s dose<\/strong> is 10.0 mg<\/strong>, based on 20% of the adult dose.<\/li>\n\n\n\n
            • To deliver this dose using a 12.5 mg\/5.00 mL<\/strong> concentration, you need to administer 4.00 mL<\/strong>.<\/li>\n\n\n\n
            • Paying attention to significant figures ensures the dosage is both accurate and safe<\/strong>\u2014especially critical in pediatric medication administration.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"

              The adult dosage of diphenhydramine, an antihistamine, is 50.0 mg. A 21 lb child should only receive 20.0% of the adult dose. Calculate this dose in milligrams. Enter the dose numerically – NO UNITS (provided): mg Use your answer to solve the next part: liquid diphenhydramine comes in a concentration of 12.5 mg per 5.00 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[25],"tags":[],"class_list":["post-210206","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/210206","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/comments?post=210206"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/210206\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=210206"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=210206"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=210206"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}