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Pharmacology case study



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    Your patient is a 75 year old male admitted through the Emergency Room w/ cough, SOB and fever, Chest x-ray revealed left lower lobe pneumonia.

    Past Medical History: Congestive Heart Failure (CHF), Chronic Obstructive Pulmonary Disease (COPD), hypertension, Diabetes Mellitus –Type 2, Gout, chronic renal insufficiency.

    Allergies: PCN

    Current medications:
    Avandia (rosiglitazone) 2mg BID
    Glucophage (metformin) 500mg OD
    Lasix (furosemide) 40 mg daily
    Potassium supplements (KCl) 20 meq daily
    Lopressor (metoprolol) 25 mg BID
    Prinivil (lisinopril) 5 mg daily
    Allopurinol (zyloprim) 100mg daily
    Advair 1 inhalation BID

    He is started on IV Zithromax (azithromycin) and Albuterol via nebulizer treatment.


    · Identify the drug classification and briefly describe the mechanism of action for each of the drugs listed above.

    · What laboratory parameters would be routinely monitored in the above patient

    – Lasix: BUN, creatinine & electrolytes (specifically potassium) loop diuretic therapy – Avandia: monitor LFT’s (increase sensitivity at of insulin at the receptor site) – Metformin: use cautiously with renal insufficiency patients—monitor BUN and creatinine (if levels are too high, not a candidate for biguinides) – Potassium supplements: potassium levels
    – Metaprolol: monitor blood glucose can mask signs of hypoglycemia – Prinivil: monitor potassium levels (has a tendency to increase), – Allopurinol: monitor BUN, creatinine

    · Why was Zithromax chosen to treat this patient?

    – Zithromax was chosen to treat this patient because it doesn’t interact with liver function and it has a broader range of coverage for both gram (+) and gram (-) bacteria that can treat the pneumonia that is possibly causing the fever. This patient is also allergic to penicillin.

    · What factor increases this patient’s risk for gout?

    – This patient is taking a loop diuretic, Lasix, which significantly increases the risk for gout due to the concentration of uric acid in the blood. – Hypertension
    – Diabetes can cause renal insufficiency which can lead to uric acid build up

    · Allopurinol is used to prevent recurrent gout in this patient. The standard dose is 300 mg daily. Why is this patient only on 100 mg daily?

    – This patient has chronic renal insufficiency and therefor the drug needs to be adjusted, this drug is also used to for maintenance therapy and not for acute attacks

    Pharmacology case study. (2016, Jul 20). Retrieved from

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