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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.
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:
- 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.
- Signs and symptoms (e.g., fever) related to the infection have
resolved or are improving.
- 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
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| 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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