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Copyright of Urologie Pro Praxi is the property of SOLEN sro and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Medicina Pro Praxi is the property of SOLEN sro and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Changes in absorption and bioavailability of drugs have been described after bariatric surgery, especially shortly after the procedure. When a significant drug-drug interaction also occurs, it is difficult to predict the final combined effect of the surgery and the interaction. In this article, we present a case report of a patient with chronic psychiatric poly-medication including carbamazepine, a strong cytochrome P450 3A4 (CYP3A4) inducer. Significant changes in serum drug concentrations were observed during the 6 months after the surgery, including increased levels of quetiapine and trazodone, that cannot be attributed to the post-surgical alteration of absorption from the gastrointestinal tract. The influence of fluctuating carbamazepine levels on concomitant medication seemed to outweigh the effect of reduced absorption after surgery. This report highlights the need for careful pre-surgical evaluation of the patient's pharmacotherapy and pre- and post-operative therapeutic drug monitoring to prevent destabilisation of chronic conditions., Competing Interests: Competing interests: None declared., (© European Association of Hospital Pharmacists 2024. No commercial re-use. See rights and permissions. Published by BMJ.)

Many patients do not take their medication as prescribed by their physician, either intentionally or unintentionally. This phenomenon, most referred as nonadherence, leads to suboptimal treatment response and increased healthcare costs. To detect nonadherence, in addition to indirect methods, we also use direct methods that detect the presence of the drug in patient's body. However, by simple assessment based on the presence or the absence of a measurable concentration of the drug or its metabolite in a blood sample, it is difficult to distinguish complete adherence from partial adherence, i.e., a situation where the patient takes the drug irregularly, or from masked adherence, where the patient takes his medicine only once before a medical appointment. A possible refinement may be allowed using pharmacokinetic simulations, which estimate whether the measured value corresponds to the expected drug level after a single or short-term administration, or whether it represents steady state confirming long-term adherence. Not only an analysis of a parent drug, but also its metabolite with more favourable pharmacokinetic properties (especially with longer half-life) can be used. Since, in many cases, nonadherence can be caused by several different reasons, multiple approaches in its detection and management are required and a multidisciplinary approach should be involved.

Proton pump inhibitors (PPIs) are very effective drugs in treatment and prevention of acid-related disorders. They are widely used in gastroesophageal reflux disease, gastroduodenal ulcers, Zollinger-Ellison syndrome or prevention and treatment of NSAIDs induced gastric lesions. They are also used in many other indications, although not always is their use appropriate. PPIs are generally well tolerated and overall benefits outweigh potential harm in most of the patients. However, their long-term use is not without a risk of adverse effects and drug-drug interactions and contributes to medical expenses and polypharmacy. As PPIs belong to most prescribed drugs, we should carefully consider the length of therapy and appropriateness of their use and regularly reevaluate the need for chronic therapy.