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Antibiotic Dosage – Understanding Correct Dosing

Antibiotic dosage defines how much of an antibiotic is taken and at what intervals. Correct dosing is essential for treatment success and for preventing the development of antibiotic resistance.

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Things worth knowing about "Antibiotic Dosage"

Antibiotic dosage defines how much of an antibiotic is taken and at what intervals. Correct dosing is essential for treatment success and for preventing the development of antibiotic resistance.

What Is Antibiotic Dosage?

Antibiotic dosage refers to the precise amount of an antibiotic prescribed, as well as the frequency and duration of its administration. It is a fundamental component of any antibiotic therapy and must be individually tailored to the patient, the type of infection, and the causative pathogen. Incorrect dosing can render therapy ineffective and may contribute to the development of antibiotic resistance.

Factors Influencing Dosage

The selection of the appropriate dose depends on several key factors:

Type of antibiotic: Different drug classes (e.g., penicillins, cephalosporins, macrolides, fluoroquinolones) have distinct pharmacological profiles that determine dosing requirements.
Type and severity of infection: Mild outpatient infections require different dosing than severe hospital-acquired infections.
Pathogen susceptibility: Ideally, the causative organism is tested via an antibiogram to determine its sensitivity to specific antibiotics.
Body weight and age: Particularly in children and elderly patients, doses are often weight-adjusted (e.g., mg/kg body weight).
Kidney and liver function: Impaired organ function can slow the metabolism and excretion of antibiotics, requiring dose adjustments.
Pregnancy and breastfeeding: Certain antibiotics are contraindicated; dosing must be reviewed for safety in these populations.

Dosing Strategies

Depending on the pharmacodynamic properties of a given antibiotic, different dosing strategies are applied:

Time-Dependent Antibiotics

For agents such as penicillins and cephalosporins, the critical factor is how long the drug concentration in the blood remains above the minimum inhibitory concentration (MIC) of the pathogen. These antibiotics are therefore typically administered multiple times daily to maintain a continuous therapeutic level.

Concentration-Dependent Antibiotics

Agents such as aminoglycosides and fluoroquinolones exert their maximum effect when a high peak concentration is achieved. Here, the height of the individual dose is the most important factor, and these antibiotics are often administered once daily at a higher dose.

AUC-Dependent Antibiotics

For some antibiotics, such as vancomycin, the total drug exposure over time (AUC, Area Under the Curve) is the key parameter for both efficacy and safety. Dosing is often monitored through blood level measurements in these cases.

Dosage Forms and Administration Notes

Antibiotics are available in various formulations:

Tablets and capsules for oral administration
Syrup or suspension for children or patients with difficulty swallowing
Intravenous infusion for severe infections or when oral intake is not possible
Intramuscular injection in certain clinical situations

It is important that antibiotics are always taken at the prescribed time and for the full duration of the course, even if symptoms have already improved. Stopping the course early can result in surviving bacteria and contribute to the development of resistance.

Antibiotic Resistance and Responsible Use

Antibiotic resistance is one of the greatest global health threats. It arises, among other causes, from underdosing, incomplete courses of treatment, or unnecessary use of antibiotics for viral infections against which they are ineffective. Both healthcare providers and patients share responsibility for the rational use of antibiotics in line with the principles of Antibiotic Stewardship.

Common Dosing Errors

Self-reducing the dose due to side effects without consulting a doctor
Missed doses that create gaps in therapeutic drug levels
Using leftover antibiotics from a previous course without a new prescription
Taking antibiotics prescribed for another person

References

World Health Organization (WHO): Antimicrobial resistance - Global action plan. WHO, Geneva, 2015. Available at: https://www.who.int/antimicrobial-resistance/global-action-plan/en/
Paul-Ehrlich-Gesellschaft fuer Chemotherapie e. V. (PEG): S2k Guideline - Calculated parenteral initial therapy of bacterial diseases in adults. AWMF, 2019.
Brunton LL, Knollmann BC (eds.): Goodman & Gilman's The Pharmacological Basis of Therapeutics. 14th edition. McGraw-Hill Education, New York, 2022.

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