Pharmacokinetics and Target Attainment of ß-lactam Antibiotics in Older People: A Systematic Review of Current Literature

Appropriate use of antibiotics for oral/dental conditions in older adults: a narrative review

OBJECTIVES

Considering the high rates in the use of antibiotics for oral/dental conditions in older patients and the rise in antimicrobial resistance, appropriate antibiotic prescription is important. This narrative review aimed to discuss the challenges and special considerations when prescribing antibiotics to older patients for oral/dental conditions.

METHODS

PubMed/MEDLINE, Scopus, Web of Science, and articles' reference lists were searched for antibiotics use for oral conditions by older patients. Moreover, scientific and professional organisations' official websites were searched for guidelines on antibiotic use in dentistry.

RESULTS

Despite several guidelines about the use of antibiotics in dentistry, specific information on their administration to older patients is missing. Relevant challenges include age-related changes in pharmacokinetics and pharmacodynamics, comorbidities and polypharmacy associated with low adherence, contraindications, adverse reactions, and drug-drug interactions. In unfit and frail older patients some antibiotics should be avoided, or doses should be adjusted, according to medical conditions or medications received. Amoxicillin, with doses adapted to renal function, is one of the safest options, while other antibiotics should be chosen with caution upon indications and individual patient characteristics.

CONCLUSIONS

Healthcare providers should prescribe antibiotics to unfit and frail older adults with caution, given the multitude of comorbidities and potential interactions with medications received. Further research is needed on the safe and effective use of antibiotics in older patients.

Have We Neglected to Study Target-Site Drug Exposure in Children? A Systematic Review of the Literature

BACKGROUND AND OBJECTIVE

Drug dosing should ideally be based on the drug concentrations at the target site, which, for most drugs, corresponds to the tissue. The exact influence of growth and development on drug tissue distribution is unclear. This systematic review compiles the current knowledge on the tissue distribution of systemically applied drugs in children, with the aim to identify priorities in tissue pharmacokinetic (PK) research in this population.

METHODS

A systematic literature search was performed in the MEDLINE and Embase databases.

RESULTS

Forty-two relevant articles were identified, of which 71% investigated antibiotics, while drug classes from the other studies were anticancer drugs, antifungals, anthelmintics, sedatives, thyreostatics, immunomodulators, antiarrhythmics, and exon skipping therapy. The majority of studies (83%) applied tissue biopsy as the sampling technique. Tonsil and/or adenoid tissue was most frequently examined (70% of all included patients). The majority of studies had a small sample size (median 9, range 1-93), did not include the youngest age categories (neonates and infants), and were of low reporting quality. Due to the heterogeneous data from different study compounds, dosing schedules, populations, and target tissues, the possibility for comparison of PK data between studies was limited.

CONCLUSION

The influence of growth and development on drug tissue distribution continues to be a knowledge gap, due to the paucity of tissue PK data in children, especially in the younger age categories. Future research in this field should be encouraged as techniques to safely investigate drug tissue disposition in children are available.

Population Pharmacokinetics of Voriconazole and Dose Optimization in Elderly Chinese Patients

Voriconazole is commonly recommended as a first-line therapy for invasive aspergillosis infections. Elderly patients are susceptible to infectious diseases owing to their decreased physical function and immune system. Our study aims to establish a population pharmacokinetics model for elderly patients receiving intravenous voriconazole, and to optimize dosing protocols through a simulated approach. An accurate fit to the concentration-time profile of voriconazole was achieved by employing a 1-compartment model featuring first-order elimination. The typical clearance rate of voriconazole was found to be 3.22 L/h, with a typical volume of distribution of 194 L. The covariate analysis revealed that albumin (ALB), gamma-glutamyl transpeptidase, and direct bilirubin had significant impacts on voriconazole clearance. Additionally, body weight was found to be associated with the volume of distribution. Individualized dosing regimens were recommended for different ALB levels based on population pharmacokinetics model prediction. The proposed dosing regimens could provide a rationale for dosage individualization, improve the clinical outcomes, and minimize drug-related toxicities.