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Early Conversion to Oral Antimicrobial Therapy
    Most of the oral antimicrobial agents have excellent bioavailabilty in addition to having spectra of antimicrobial activity similar to those of parenteral agents. This enables us to convert from IV to PO therapy as soon as the patient is able to tolerate oral medications A timely conversion usually occurs within 2-3 days after admission. This approach, which is known as sequential or switch therapy, has been used successfully in the management of various infections. It should also be noted that under certain circumstances, it is appropriate to begin with an oral antimicrobial agent, particularly when dealing with mild to moderate cases of infection.


    iv-to-po

    In addition to reducing treatment costs and allowing earlier discharge from the hospital, early conversion to oral antimicrobial therapy increases patient comfort and mobility and minimizes the risk of adverse events associated with iv therapy (phlebitis, fluid overload, infections, etc.). Eligible patients should meet three main criteria:

    1. Patient has a functional GI tract and tolerates oral nutrition and medications. Patients with severe diarrhea, protracted vomiting (or continuous nasogastric suction), ileus, or malabsorption syndrome should be excluded from immediate consideration for oral therapy.
    2. Signs and symptoms (e.g., fever) related to the infection have resolved or are improving.
    3. Patient is not febrile neutropenic.

    The following table provides representative examples. Doses will vary according to the patient condition and the clinical setting.

    Intravenous Regimen Oral Equivalent
    Acyclovir 400 mg q8h Acyclovir 800 mg 5 x per day
    Ampicillin 1 g q6h Amoxicillin 500 mg q8h
    Cefazolin 1 g q8h Cephalexin 500 mg q6h
    Cefotetan 1 or 2 g q12h Cefuroxime 250 - 500 mg q12h
    Ciprofloxacin 400 mg q12h Ciprofloxacin 500 or 750 mg q12h
    Ofloxacin 400 mg q12h Ofloxacin 400 mg q12h
    Clindamycin 300 - 600 mg q8h Clindamycin 300 or 450 mg q6h
    Co-trimox (80/16 mg/mL) 10-20 mL q12h Co-trimox DS (800/160) 1-2 tabs q12h
    Erythromycin 500 - 1000 mg q6h Erythromycin 500 mg q6h
    Fluconazole 100 mg q24h Fluconazole 100 mg q24h
    Gentamicin or Tobramycin Co-trimox DS (800/160) 1-2 tabs q12h

    or ofloxacin 400 mg q12h

    Metronidazole 500 mg q8h Metronidazole 500 mg q8h
    Nafcillin 500 or 1000 mg q6h Dicloxacillin 500 mg q6h
    Unasyn 1.5 or 3 g q6h Augmentin 500 mg q8h or 875 mg q12h

 

 

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