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Updated: Dec 23, 2025

Multiplex Therapeutic Drug Monitoring by Isotope-dilution HPLC-MS/MS of Antibiotics in Critical Illnesses
Published on: August 30, 2018
Oral or intravenous antibiotics?
Kate McCarthy1,2,3, Minyon Avent1,2,3
1Royal Brisbane and Women's Hospital, Brisbane.
Oral antibiotics are often a safe and effective alternative to intravenous antibiotics, reducing adverse effects and costs. Guidelines support switching to oral therapy after a short IV course for many infections.
Area of Science:
- Infectious Diseases
- Pharmacology
- Hospital Medicine
Background:
- Intravenous (IV) antibiotics are frequently overused in hospital settings.
- Oral antibiotic therapy offers advantages, including fewer adverse effects and lower costs compared to IV administration.
- Many infections treatable with IV antibiotics can be effectively managed with oral agents.
Purpose of the Study:
- To evaluate the appropriate use of oral antibiotics as an alternative to intravenous therapy.
- To highlight infections suitable for a switch from IV to oral antibiotics.
- To discuss guidelines for timing the switch to oral therapy without compromising efficacy.
Main Methods:
- Review of current clinical guidelines and evidence regarding antibiotic administration routes.
- Identification of specific infections where a switch from IV to oral antibiotics is feasible.
- Analysis of factors influencing the decision to transition from IV to oral therapy.
Main Results:
- Oral antibiotics can successfully manage numerous infections, including pneumonia, complicated urinary tract infections, intra-abdominal infections, Gram-negative bacteremia, acute exacerbations of chronic lung disease, and skin/soft tissue infections.
- A short course of IV antibiotics followed by oral therapy is effective for many conditions.
- Research is exploring earlier oral switch options for bone and joint infections and infective endocarditis.
Conclusions:
- Optimizing antibiotic use by favoring oral over intravenous administration when appropriate can improve patient outcomes and reduce healthcare costs.
- Adherence to established guidelines facilitates safe and effective transitions from IV to oral antibiotic therapy.
- Further research into earlier oral switch protocols for complex infections is warranted.
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