Meccanismo d'azione dei FANS (Antinfiammatori Non Steroidei)
I FANS agiscono inibendo l'attività delle enzimi ciclossigenasi, note come COX-1 e COX-2. Questi enzimi sono coinvolti nella produzione di prostaglandine, composti lipidici che svolgono un ruolo chiave nell'innescare infiammazione, dolore e febbre nel corpo. Bloccando questi enzimi, i FANS riducono efficacemente la produzione di prostaglandine, diminuendo così infiammazione, dolore e febbre.
COX-1 è presente nella maggior parte dei tessuti ed è coinvolta nella protezione della mucosa gastrica, nel supporto della funzione renale e nella promozione dell'aggregazione piastrinica (coagulazione del sangue).
COX-2 è principalmente coinvolta nella risposta infiammatoria ed è prodotta in risposta a lesioni o infezioni.
Tipi di FANS
I FANS possono essere categorizzati in base alla loro selettività per gli enzimi COX-1 e COX-2:
FANS non selettivi, come ibuprofene, naprossene e aspirina, inibiscono sia gli enzimi COX-1 che COX-2. Pur essendo efficaci nella riduzione del dolore e dell'infiammazione, possono anche portare a effetti collaterali legati all'inibizione di COX-1, come problemi gastrointestinali e sanguinamenti.
Inibitori selettivi di COX-2, come celecoxib, mirano specificamente all'enzima COX-2, riducendo il rischio di effetti collaterali gastrointestinali ma potenzialmente aumentando il rischio di problemi cardiovascolari.
Benefici e usi terapeutici
I FANS sono apprezzati per la loro capacità di fornire un rapido sollievo dal dolore e dall'infiammazione. Sono comunemente usati per:
Sollievo dal dolore acuto come mal di testa, crampi mestruali, dolore dentale e stiramenti muscolari.
Condizioni croniche inclusi artrite (sia osteoartrite che artrite reumatoide), gotta e altre condizioni infiammatorie (1).
Riduzione della febbre in quanto aiutando ad abbassare la temperatura corporea in caso di febbre.
Effetto antiaggregante. L'aspirina a basse dosi viene utilizzata per il suo effetto antiaggregante, riducendo il rischio di infarti e ictus in certi individui.
Potenziali rischi ed effetti collaterali
Sebbene i FANS siano generalmente sicuri quando utilizzati secondo le indicazioni riportate nel foglio illustrativo, possono comportare rischi, specialmente con l'uso a lungo termine o in certe popolazioni:
Problemi gastrointestinali, inclusi ulcere, sanguinamenti e perforazione dello stomaco o dell'intestino. I fattori di rischio includono età avanzata, problemi precedenti e l'uso di certi altri farmaci.
Rischi cardiovascolari. Aumento del rischio di infarto e ictus, particolarmente con l'uso a lungo termine e in coloro con malattie cardiovascolari preesistenti (2) anche se recentemente, sono in corso studi per attenuarne gli effetti collaterali (3).
Danno renale. I FANS possono ridurre il flusso sanguigno ai reni, potenzialmente causando danni renali nel tempo.
Reazioni allergiche. Alcuni individui possono sperimentare reazioni allergiche ai FANS.
Conclusione
I FANS sono uno strumento cruciale nella gestione del dolore e dell'infiammazione ma richiedono un uso attento per minimizzare i potenziali rischi. È importante consultare i professionisti della salute per consigli personalizzati alle specifiche condizioni di salute e necessità.
Bibliografia_____________________________________________________________________
(1) Crofford LJ. Use of NSAIDs in treating patients with arthritis. Arthritis Res Ther. 2013;15 Suppl 3(Suppl 3):S2. doi: 10.1186/ar4174. Epub 2013 Jul 24. PMID: 24267197; PMCID: PMC3891482.
Abstract. Patients with rheumatic diseases, including rheumatoid arthritis and osteoarthritis, almost universally describe pain and stiffness as important contributors to reduced health-related quality of life. Of the treatment options available, NSAIDs are the most widely used agents for symptomatic treatment. NSAIDs are effective anti-inflammatory and analgesic drugs by virtue of their ability to inhibit biosynthesis of prostaglandins at the level of the cyclooxygenase enzyme. However, many of the adverse effects of NSAIDs are also related to inhibition of prostaglandin production, making their use problematic in some patient populations. For the clinician, understanding the biology of prostaglandin as it relates to gastrointestinal, renal, and cardiovascular physiology and the pharmacologic properties of specific NSAIDs is key to using these drugs safely. Of particular importance is the recognition of co-morbid conditions and concomitant drugs that may increase the risk of NSAIDs in particular patients. In patients with risk factors for NSAID toxicity, using the lowest dose of a drug with a short half-life only when it is needed is likely to be the safest treatment option. For those patients whose symptoms cannot be managed with intermittent treatment, using protective strategies is essential.
(2) Ghosh R, Alajbegovic A, Gomes AV. NSAIDs and Cardiovascular Diseases: Role of Reactive Oxygen Species. Oxid Med Cell Longev. 2015;2015:536962. doi: 10.1155/2015/536962.
Abstract. Nonsteroidal anti-inflammatory drugs (NSAIDs) are the most commonly used drugs worldwide. NSAIDs are used for a variety of conditions including pain, rheumatoid arthritis, and musculoskeletal disorders. The beneficial effects of NSAIDs in reducing or relieving pain are well established, and other benefits such as reducing inflammation and anticancer effects are also documented. The undesirable side effects of NSAIDs include ulcers, internal bleeding, kidney failure, and increased risk of heart attack and stroke. Some of these side effects may be due to the oxidative stress induced by NSAIDs in different tissues. NSAIDs have been shown to induce reactive oxygen species (ROS) in different cell types including cardiac and cardiovascular related cells. Increases in ROS result in increased levels of oxidized proteins which alters key intracellular signaling pathways. One of these key pathways is apoptosis which causes cell death when significantly activated. This review discusses the relationship between NSAIDs and cardiovascular diseases (CVD) and the role of NSAID-induced ROS in CVD.
(3) Abadi SS, Moin A, Veerabhadrappa GH. Review Article: Fabricated Microparticles: An Innovative Method to Minimize the Side Effects of NSAIDs in Arthritis. Crit Rev Ther Drug Carrier Syst. 2016;33(5):433-488. doi: 10.1615/CritRevTherDrugCarrierSyst.2016016624. PMID: 27910742.
Abstract. Microparticles are polymeric bodies ranging 1-1000 µm that constitute a variety of forms such as microcapsules, microspheres, microcages, microshells, microrods, biosensors microparticles, radiolabeled microparticles, and so forth. This review focuses on general microparticles, mainly microcapsules and microspheres. Nonsteriodal anti-inflammatory drugs (NSAIDs) are one of the mostcommonly prescribed medications in the world. Most of the NSAIDs available have severe side effects. With increased awareness of NSAID-induced gastrointestinal (GI) side effects, safety has become a priority in treatment of arthritis and other inflammatory diseases with NSAIDs. A trend in NSAID development has been to improve therapeutic efficacy while reducing the severity of GI side effects by altering dosage through modified release to optimize drug delivery. One such approach is the use of fabricated microparticles such as microcapsules and microspheres as carriers of drugs. Microparticles provide delivery of macromolecules and micromolecules via different routes and effectively control the release profile of such drugs. Microcapsules and microspheres are compatible with most natural and synthetic polymers and can be used for several routes of administration, including parenteral, oral, nasal, intra-ocular, topical, and the like. Because of greater stability and multiple manufacturing techniques, microspheres and microcapsules are preferred as drug carriers over other colloidal drug delivery systems. Microparticles provide effective protection of the encapsulated agent against degradation by enzymatic activities, controlled and confined delivery of drugs from a few hours to months, and ingenious administration compared to alternative forms of controlled-release parenteral dosages, such as macro-sized implants. This comprehensive overview of fabricated microparticles describes microencapsulation technologies to produce microparticles for targeted therapy of arthritis and other inflammatory diseases which provide constant and prolonged therapeutic effects that reduce dosing frequency and thereby minimize potential adverse effects of NSAIDs such as GI irritation and insufficient patient compliance. The present review describes the latest developments in microparticulate drug delivery systems and the best alternatives for safe and effective microcapsular systems in a controlled manner for the delivery of NSAIDs.
