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18 November, 15:31

Rx: Codeine phosphate 30 mg/tsp Tussin syrup 30mL Elixophyllin qs 240 mL Sig: 5mL qid pc hs If 5 mL of Tussin syrup contains 100 mg of guaifenesin, how many milligrams of the drug would be taken daily?

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  1. 18 November, 15:43
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    50 mg.

    Explanation:

    From the prescription, 240 ml amount is to be prepared containing 30 ml tussin syrup. As the frequency is 5 mL qid, it means 5mL of syrup is to be administered four times daily i. e. 20 mL daily. To calculate the amount of tussin taken daily,

    30 mL tussin = X mL of tussin

    240 mL solution 20ml solution

    ⇒ 2.5 mL of tussin

    5 ml tussin contains 100mg guafenesin,

    So,

    ⇒ 2.5 ml of tussin contains 100x2.5/5 = 50 mg guaifenesin
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