Oral administration of an extended-release formulation of nitrofurantoin results in high concentrations in the urine of dogs.

OBJECTIVE: Sporadic bacterial cystitis in both dogs and humans is often caused by Escherichia coli. In humans, nitrofurantoin is a first-line antimicrobial for the treatment of bacterial cystitis but in dogs a lack of available data may be part of the reason it is only recommended as a second-line treatment. The objective of this preliminary study was to determine the plasma pharmacokinetics and urine concentrations of nitrofurantoin monohydrate-macrocrystalline in dogs. ANIMALS: 8 healthy female hound dogs. PROCEDURES: From July 26 to July 28, 2021, dogs received a single oral dose of nitrofurantoin monohydrate-macrocrystalline 100 mg with food. Blood and urine were collected at predetermined times. Nitrofurantoin concentrations were assayed by UPLC-MS/MS and plasma data were analyzed using noncompartmental methods. RESULTS: Plasma concentrations were low for all dogs with a mean ± SD maximum concentration (Cmax) of 0.242 ± 0.098 µg/mL (range, 0.14 to 0.42 µg/mL) occurring between 2 and 24 hours. Urine concentrations were manyfold higher than for plasma. Cmax in urine was 134 ± 54 µg/mL (range, 49.1 to 218 µg/mL) occurring between 6 and 36 hours. As seen in other species, nitrofurantoin concentrated in urine with concentrations being 500 times higher than the concentration in plasma. CLINICAL RELEVANCE: Results suggested that nitrofurantoin monohydrate-macrocrystalline formulation of nitrofurantoin should be effective in treating bacterial cystitis caused by susceptible uropathogens.

Veterinary prescription errors in a community pharmacy setting: A retrospective review.

BACKGROUND: Community pharmacies are poised to see more veterinary prescriptions as a result of increased pet ownership especially during the coronavirus disease 19 pandemic. Concern has been raised about the lack of veterinary pharmacy training that community pharmacists receive, but no studies have evaluated the actual prevalence of errors in veterinary prescriptions including the prevalence of prescription writing errors. OBJECTIVES: This study identifies the prevalence of errors in veterinary prescriptions at independent community pharmacies. METHODS: An electronic form was used to ensure required information was pulled from the pharmacy software systems in a consistent manner. Information was pulled from the hard copy image and the prescription label corresponding to that fill. Prescribing trends, such as species and errors, were assessed using descriptive statistics for the overall sample. Error comparisons between written and verbal prescriptions and between weight-based and nonweight-based prescriptions were assessed using chi-square and Fisher exact tests. RESULTS: Weight, although not legally required but clinically necessary for evaluation of veterinary prescriptions, was omitted from 97.8% of prescriptions. When evaluating the prevalence of errors between handwritten and verbal prescriptions, it was more likely to see errors in prescriptions handwritten by the veterinarian (105 of 119; 88%) than verbal prescriptions (257 of 389; 66%). Conversely, handwritten prescriptions were less likely to omit the required Drug Enforcement Agency number on controlled substance prescriptions. CONCLUSION: Based on the number of errors seen in both handwritten and verbal prescriptions, emphasis should be placed on training pharmacists to be competent in clinically evaluating veterinary prescriptions and training veterinarians on handwriting prescriptions to include both legally and clinically required information needed before dispensing.