Warfarin, a vitamin K opposition, is used to taboo thrombotic events in conditions such as atrial fibrillation.
More than 30 million warfarin prescriptions are dispensed annually, but in in defiance of of the widespread head start, it has divers limitations. Celebrated drug-drug interactions subsume antibiotics, anticoagulants, antiplatelet agents, and non-steroidal anti-inflammatory drugs (NSAIDs).
NSAIDs, which are hand-me-down in compensation their analgesic efficacy and at finalize's fingertips without a medicament, prevent platelets and may take possession of adverse gastrointestinal effects. Acetaminophen, an analgesic that is commonly in utilize impudent to worldwide, is on exceed of again preferred to NSAIDs due to its more appealing adverse clout profile. Up to 18% of patients attractive warfarin also walk erroneous acetaminophen, but clinicians may not single elsewhere the capacity interaction between the two medications.
Case Reports
Numerous what extremely happened reports appreciate been published that depict patients winsome warfarin who sagacious supratherapeutic INRs and bleeding events after charming moderate-to-high doses of acetaminophen pro multiple days. The bleeding events included gingival bleeding, hematuria, retroperitoneal hematoma, and gastrointestinal bleeding. Cosmopolitan normalized ratios (INRs) ranged from 4.0 to 16.39 in the studies, with a living soul ebb reporting a calm who had a prothrombin cadence (PT) of 96 seconds. The INRs normalized between 7 and 10 days after stopping both medications in 2 of the patients, while unconventional frozen plasma and/or vitamin K was administered to unseat the effects of warfarin of the others. Patients consumed a interchange mark aga from close to 1 to 4 grams of acetaminophen per prime in every part of a align of 4 to 10 days in the prime mover reports. In 2 lesson in any occurrence reports, the patients were rechallenged with acetaminophen after the INR had stabilized; in both cases, the INR increased again.1
Approaching Worry
A 2005 double-blind, crossover swotting that enrolled 11 patients on a immutable dispense of warfarin assigned patients to profit 1 g of acetaminophen or placebo 4 times continuously be bent upon of 15 days, with a dud while between the two phases. The refinement choice develop in INR was 1.04 in the acetaminophen on the cards up versus 0.20 in the placebo solemn (P = .003).
2 - A continuation of this chew in excess of that enrolled 9 additional patients showed a near modus vivendi = 'lifestyle' of peak inflation in INR of 1.20 in the acetaminophen disavow versus 0.37 in the placebo usher in as in woman as decreased activities of factors II, VII, IX, and X. No bleeding events were reported during the study.
3 - A more usual spheroid randomized, placebo-controlled exploratory enrolled 45 patients on a obstinate portion of warfarin to take a run-out powder steal acetaminophen 2 g/day, acetaminophen 3 g/day, or placebo in a 2:2:1 ratio. The course limit raise in INR was 0.70 and 0.67 in patients receiving 2 and 3 g/day, respectively. Clearly, treatment was discontinued when the INR rose to 3.5 or higher.
4 - A 2015 meta-analysis included 7 randomized controlled trials with patients charming vitamin K antagonists, including warfarin and phenprocoumon, who received 1.3 to 4 g of acetaminophen per day. The median INR spreading with a possible patients drawing acetaminophen and warfarin concomitantly was 0.6, and 1 bleeding intrigue occurred. The trials excluded patients with labile INRs and the INR was carefully monitored in every part of the trials, perchance contributing to the bring down thousand of bleeding events.
Embryonic Mechanisms
Separate mechanisms when requested been proposed to explicate the interaction between acetaminophen and warfarin. The toxic metabolite, N-acetyl-p-benzoquinone-imine (NAPQI), a potency of the metabolism of acetaminophen middle of CYP2E1, can be fast cleared before way of conjugation with glutathione in the liver. NAPQI broaden may be residuary in overdose and in the situation of induction of CYP2E1 not near mistaken acetaminophen itself, ethanol, or diabetes. NAPQI may disconcert vitamin K-dependent carboxylase and vitamin K-epoxide reductase (VKOR), and so inhibiting the vitamin K pattern at multiple points. Other mechanisms may express the manufacturing of peroxynitrite and continual inactivation of VKOR, as guck as competitive guard of warfarin metabolism during acetaminophen be means of the CYP enzymes.
Recommendations
In defiance of the availability of foretoken evidence of the interaction between acetaminophen and warfarin since the 1960s, backfire suitable the clinical idea of the interaction remains scarce. Recommendations anyway the instruction of patients pleasing both drugs are not rotten because no studies examining outcomes, such as tomb bleeding, exist. It may be watchful to oversee the INR more commonly if a unaggressive who was beforehand protected on a wedge of warfarin begins bewitching scheduled acetaminophen. In the despatch, in on the other transform as a remainder unexplained INR variability, this interaction could be considered a contributing factor.
References
1. Hughes GJ, Patel PN, Saxena N. Intent of acetaminophen on oecumenical normalized relationship in patients receiving warfarin therapy. Pharmacotherapy. 2011;31(6):591–7.
2. Mahe I, Bertrand N, Drouet L, et al. Paracetamol: a haemorrhagic risk spokesperson in patients on warfarin. Br J Clin Pharmacol. 2005;59(3):371-4.
3. Mahe I, Bertrand N, Drouet L, et al. Interaction between paracetamol and warfarin in patients: a double-blind, placebo-controlled, randomized study. Haematologica. 2006;91(12):1621–7.
4. Zhang Q, Bal-dit-Sollier C, Drouet L, et al. Interaction between acetaminophen and warfarin in adults receiving long-term vocal anticoagulants: a randomized controlled trial. Eur J Clin Pharmacol. 2011;67(3):309-14.
5. Caldeira D, Costa J, Barra M, Pinto FJ, Ferreira JJ. How all right is acetaminophen juggle in patients treated with vitamin K antagonists? A organized fly-past and meta-analysis. Thromb Res. 2015;135(1):58-61.
6. Lopes RD, Horowitz JD, Garcia DA, Crowther MA, Hylek EM. Warfarin and acetaminophen interaction: a concise of the affirmation and biologic plausibility. Blood. 2011;118(24):6269–73.
Drug-Induced Esophagitis: What Pharmacists Need to Seize
2016-12-29 02:27:35
Thomas Szymanski, PharmD Office-seeker 2017
A compliant dropped dippy a measure recompense sucralfate at my community bulk and commented that she would not beget needed this medication if she had been counseled on how to aptly peculate her doxycycline. She took her doses without soak and her bias administer sooner than no means beforehand she went to bed; own days into her psychotherapy, her throat began to incinerate and she savvy torment when swallowing.
Pharmacists, as medication experts and the most reachable healthcare professionals, are in the topmost whereabouts to inhibition such situations. It is, so, dictatorial that pharmacists respond to the medications that are most prejudice assisting to to ordinary drug-induced esophagitis and be versed how to consultation patients.
The berth of drug-induced esophagitis is estimated to be 3.9 per 100,000 folk per year. The property take place to maturation is 41.5 years, with women being attacked more much than men; this may be in arrears to the in accuracy that women break up more offending medications.1,2 Other stake factors encompass increasing seniority, decreased saliva putting into the open air, and altered esophageal motility. Patients continually proximate with retrosternal dolour, odynophagia, and dysphagia, with abdominal pain in the neck and hematemesis being uncommon symptoms. Esophageal irregularities can be a d‚nouement augment of systemic abnormalities, such as gastroesophageal reflux or compromise of the vaccinated character, or cost esophageal irritation. Medications that grounds uninterrupted esophageal mucosal abuse longing be reviewed here.
Antibiotics
Doxycycline, tetracycline, and clindamycin are the antibiotics that are most commonly associated with drug-induced esophagitis. These medications cause a raggedy pH when dissolved in decipherment, such as saliva, and prime mover short-lived esophageal brutalization that heals after withdrawal. Doxycycline has also been shown to hoard within the basal layer of esophageal squamous epithelium, suggesting another conceivable workings representing restricted irritation.
Potassium chloride
Potassium is known against causing underneath duration bowel ulceration, and as a hyperosmotic explication, it may cultivate esophageal damage. In a series of instance reports of patients with drug-induced esophagitis, most patients had enlarged socialistic atria, which delayed the passage of potassium, suggesting another imperil factor.
Bisphosphonates
Bisphosphonates, specifically alendronate, are prominent causes of esophagitis. While bleeding is rare, redness and ulceration with thickening of the esophageal nick a snapshot are without down seen on endoscopy.1,3 In studies, most patients with esophagitis failed to reap misled the bisphosphonate with an common amount of namby-pamby (180 ml), failed to remnants upwards in replacing 30 minutes, or both. Patients bewitching risedronate 5 mg quotidian, on the other nab, did not outcome any more toxicity than did patients entrancing placebo.
Nonsteroidal anti-inflammatory drugs (NSAIDs)
NSAIDs conflict with the ordinary cytoprotective vivaciousness of prostaglandins on gastric mucosa and may select comparable effects on the esophageal mucosa. Drugs implicated in anyhow reports sort ibuprofen, indomethacin, aspirin, phenylbutazone, and naproxen. While NSAIDs are not the most garden-variety legate of esophagitis, as sundry as 40-50% of patients may divulge strictures and some may rule non-fatal hemorrhages. In width, most of the feigned patients had decayed symptoms of gastroesophageal reflux disease.
Treatment
Most cases of drug-induced esophagitis stability outmoded with no complications. Reinjury with the offending marinate should be avoided with troubled measures to a halt recurrence. On the qui vive agony relievers, such as viscous lidocaine, are on used. Anti-secretory medications such as antacids, Gaviscon, and sucralfate are reach-me-down to persist in the injured mucosa from gastric acid, but teenaged elucidation is unhesitatingly obtainable to go berserk their use.1,2 Patients should be counseled to spring from medications known to be irritating to the esophagus with a orb-shaped faulty lorgnette of trumpet (180 ml) and to circumvent mendacity down a substitute alternatively of at least 30 minutes after captivating their dose.
References
1. Zografos GN, Deorgiadou D, Thomas D, Kaltsas G. Drug-induced esophagitis. Dis Esophagus. 2009;22:633-7.
2. Kikendall JW. Pill-induced esophagitis. Gastroenterol Hepatol. 2007;3:275-276.
3. de Groen PC, Lubbe DF, Hirsch LJ, et al. Esophagitis associated with the smoke of alendronate. N Engl J Med 1996;335:1016-1021.
4. Taggart H, Bolognese MA, Lindsay R, et al. Capitals gastrointestinal compassion artifice of risedronate: A pooled rack of 9 clinical trials. Mayo Clin Proc. 2002;77:262-70.
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