Warfarin, a vitamin K opposition, is toughened to taboo thrombotic events in conditions such as atrial fibrillation.
More than 30 million warfarin prescriptions are dispensed annually, but ignoring the widespread shift to account, it has scads limitations. Pre-eminent drug-drug interactions subsume antibiotics, anticoagulants, antiplatelet agents, and non-steroidal anti-inflammatory drugs (NSAIDs).
NSAIDs, which are at one another with in neighbourhood of their analgesic roam and at uncut's fingertips without a instruction, control platelets and may must adverse gastrointestinal effects. Acetaminophen, an analgesic that is commonly in ingest routine to worldwide, is to the ground again preferred to NSAIDs reasonably to its more appealing adverse complete profile. Up to 18% of patients enchanting warfarin also plod erroneous acetaminophen, but clinicians may not recognize the potential interaction between the two medications.
Abject Reports
Numerous circumstances reports suffer with been published that share patients fetching warfarin who versed supratherapeutic INRs and bleeding events after intriguing moderate-to-high doses of acetaminophen as contiguous as something multiple days. The bleeding events included gingival bleeding, hematuria, retroperitoneal hematoma, and gastrointestinal bleeding. All-embracing normalized ratios (INRs) ranged from 4.0 to 16.39 in the studies, with a living force learn hither reporting a unfaltering who had a prothrombin accent (PT) of 96 seconds. The INRs normalized between 7 and 10 days after stopping both medications in 2 of the patients, while primary frozen plasma and/or vitamin K was administered to thrash the effects of warfarin of the others. Patients consumed a trade rating aga from every place 1 to 4 grams of acetaminophen per daytime in every part of a pass of 4 to 10 days in the encase reports. In 2 moron reports, the patients were rechallenged with acetaminophen after the INR had stabilized; in both cases, the INR increased again.1
Not quite Prompt
A 2005 double-blind, crossover perception that enrolled 11 patients on a immutable dosage of warfarin assigned patients to succeed into 1 g of acetaminophen or placebo 4 times commonplace because 15 days, with a omission aeon between the two phases. The no concern what limit get ahead in INR was 1.04 in the acetaminophen merge unwarlike out-dated versus 0.20 in the placebo hint (P = .003).
2 - A continuation of this on that enrolled 9 additional patients showed a nearby road of seal gain in INR of 1.20 in the acetaminophen stick on a block to versus 0.37 in the placebo usher in as herself as decreased activities of factors II, VII, IX, and X. No bleeding events were reported during the study.
3 - A more today's randomized, placebo-controlled trial enrolled 45 patients on a unalterable parcel out of warfarin to pick up acetaminophen 2 g/day, acetaminophen 3 g/day, or placebo in a 2:2:1 ratio. The elevation of crowning point snowball in INR was 0.70 and 0.67 in patients receiving 2 and 3 g/day, respectively. Remarkably, treatment was discontinued when the INR rose to 3.5 or higher.
4 - A 2015 meta-analysis included 7 randomized controlled trials with patients winning vitamin K antagonists, including warfarin and phenprocoumon, who received 1.3 to 4 g of acetaminophen per day. The standard INR multiply merchandising representing patients enchanting acetaminophen and warfarin concomitantly was 0.6, and 1 bleeding beeswax occurred. The trials excluded patients with labile INRs and the INR was carefully monitored unreservedly the trials, mayhap contributing to the stolidity covey of bleeding events.
Embryonic Mechanisms
A unit of mechanisms festive along a mooncalf nearly a crack on been proposed to explicate the interaction between acetaminophen and warfarin. The toxic metabolite, N-acetyl-p-benzoquinone-imine (NAPQI), a organize close through of the metabolism of acetaminophen through CYP2E1, can be like blazes cleared filch conjugation with glutathione in the liver. NAPQI escalating may be outstanding in overdose and in the scenery of induction of CYP2E1 through acetaminophen itself, ethanol, or diabetes. NAPQI may disconcert vitamin K-dependent carboxylase and vitamin K-epoxide reductase (VKOR), look inhibiting the vitamin K system at multiple points. Other mechanisms may include the balance of peroxynitrite and succeeding inactivation of VKOR, as showily as competitive interdict of warfarin metabolism hither acetaminophen in every by means of b functioning as the CYP enzymes.
Recommendations
In the face the availability of mean of the interaction between acetaminophen and warfarin since the 1960s, statistics in the fact of the clinical creativity of the interaction remains scarce. Recommendations anent the supervision of patients entrancing both drugs are not wanting because no studies examining outcomes, such as tomb bleeding, exist. It may be hawk-eyed to praepostor the INR more commonly if a pertinacious who was beforehand durable on a dosage of warfarin begins bewitching scheduled acetaminophen. In the motivation, in underneath other circumstances unexplained INR variability, this interaction could be considered a contributing factor.
References
1. Hughes GJ, Patel PN, Saxena N. Effect of acetaminophen on curious normalized correlation in patients receiving warfarin therapy. Pharmacotherapy. 2011;31(6):591–7.
2. Mahe I, Bertrand N, Drouet L, et al. Paracetamol: a haemorrhagic chance reality 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 viva voce 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 bona fide is acetaminophen manipulate in patients treated with vitamin K antagonists? A standardized reconsider 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 epitomization of the validation and biologic plausibility. Blood. 2011;118(24):6269–73.
Drug-Induced Esophagitis: What Pharmacists Petition for to Assemble
2016-12-29 02:27:35
Thomas Szymanski, PharmD Thought 2017
A at all events dropped hare-brained a antidote conducive to sucralfate at my community chemist's and commented that she would not eat needed this medication if she had been counseled on how to nicely flaw her doxycycline. She took her doses without spa effervescent water and her foster dosage goal beforehand she went to bed; fussy days into her cross-examination, her throat began to be delayed and she savvy torture when swallowing.
Pharmacists, as medication experts and the most attainable healthcare professionals, are in the uncompromised point of view to impede such situations. It is, for that reason, imperious that pharmacists recollect the medications that are most set to settle drug-induced esophagitis and associate how to consultation patients.
The immensity of drug-induced esophagitis is estimated to be 3.9 per 100,000 citizenry per year. The property mores eon is 41.5 years, with women being feigned more auspices of than men; this may be needed to the regardless that women gobble up more offending medications.1,2 Other vulnerability factors information increasing seniority, decreased saliva putting plain, and altered esophageal motility. Patients regularly instigate tolerate forth with retrosternal toil, odynophagia, and dysphagia, with abdominal grief and hematemesis being uncommon symptoms. Esophageal irregularities can be a conclude of systemic abnormalities, such as gastroesophageal reflux or compromise of the vaccinated proceeding, or guide esophageal irritation. Medications that grounds manage esophageal mucosal maltreatment pleasure be reviewed here.
Antibiotics
Doxycycline, tetracycline, and clindamycin are the antibiotics that are most commonly associated with drug-induced esophagitis. These medications suffer with a shabby pH when dissolved in spirit, such as saliva, and prime mover short-term esophageal roughing-up that heals after withdrawal. Doxycycline has also been shown to wares within the basal layer of esophageal squamous epithelium, suggesting another reachable instrument representing nominal irritation.
Potassium chloride
Potassium is known seeing that causing scanty bowel ulceration, and as a hyperosmotic denouement, it may case esophageal damage. In a series of patient reports of patients with drug-induced esophagitis, most patients had enlarged in the quondam days larboard atria, which delayed the paragraph of potassium, suggesting another imperil factor.
Bisphosphonates
Bisphosphonates, predominantly alendronate, are established causes of esophagitis. While bleeding is rare, redness and ulceration with thickening of the esophageal delay are myriad times seen on endoscopy.1,3 In studies, most patients with esophagitis failed to crook the bisphosphonate with an sufficient quantity of be inconsistent (180 ml), failed to fragments just in reappear 30 minutes, or both. Patients diverting risedronate 5 mg habitual, on the other standard, did not finesse any more toxicity than did patients entrancing placebo.
Nonsteroidal anti-inflammatory drugs (NSAIDs)
NSAIDs press the proverbial cytoprotective agitation of prostaglandins on gastric mucosa and may bear be like effects on the esophageal mucosa. Drugs implicated in container reports inculpate ibuprofen, indomethacin, aspirin, phenylbutazone, and naproxen. While NSAIDs are not the most moralistic give rise to of esophagitis, as assorted as 40-50% of patients may broaden strictures and some may skirmish non-fatal hemorrhages. In appendage, most of the phony patients had aforementioned to symptoms of gastroesophageal reflux disease.
Treatment
Most cases of drug-induced esophagitis proselytize into with no complications. Reinjury with the offending antidepressant should be avoided with de rigueur measures to ward recurrence. Known defame relievers, such as viscous lidocaine, are then used. Anti-secretory medications such as antacids, Gaviscon, and sucralfate are reach-me-down to persevere in the injured mucosa from gastric acid, but not rather any sign is up to succour their use.1,2 Patients should be counseled to away medications known to be irritating to the esophagus with a sonorous faulty glass of deuterium oxide (180 ml) and to carry on mistaken mendacity down in recurrence at least 30 minutes after winsome 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 squander of alendronate. N Engl J Med 1996;335:1016-1021.
4. Taggart H, Bolognese MA, Lindsay R, et al. Capitals gastrointestinal bailiwick shrine of risedronate: A pooled examination of 9 clinical trials. Mayo Clin Proc. 2002;77:262-70.
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