{"id":21276,"date":"2020-06-16T18:49:14","date_gmt":"2020-06-16T18:49:14","guid":{"rendered":"https:\/\/todaysveterinarypractice.com\/?p=21276"},"modified":"2023-02-14T21:45:20","modified_gmt":"2023-02-14T21:45:20","slug":"carprofen-for-dogs-osteoarthritis","status":"publish","type":"post","link":"https:\/\/navc.sitepreview.app\/todaysveterinarypractice.com\/pharmacology\/carprofen-for-dogs-osteoarthritis\/","title":{"rendered":"Carprofen for Dogs: Osteoarthritis and Pain Management"},"content":{"rendered":"<p class=\"p1\"><span class=\"s1\">Canine osteoarthritis results in chronic pain and decreased physical activity. Nonsteroidal anti-inflammatory drugs (NSAIDs) are widely recognized as the standard of care for chronic pain, including OA.<sup>1<\/sup> This article focuses on carprofen for dogs, one specific NSAID.<\/span><\/p>\n<p class=\"p1\"><span class=\"s1\">OA, sometimes referred to as degenerative joint disease or DJD, affects approximately 1 in 5 adult dogs in the United States and is the number 1 cause of chronic pain in dogs.<sup>2<\/sup> Statistics from 2016 estimate that about 10 million to 12 million dogs in the United States show signs of OA, resulting in a monthly per-clinic average of 45 visits from arthritic dogs, with older and heavier dogs being overrepresented in this population.<sup>2<\/sup><\/span><\/p>\n<p class=\"p1\"><span class=\"s1\">OA is characterized by pain and lameness due to tissue changes and loss of articular cartilage in the synovial joint and may also include remodeling of the subchondral bone.<sup>3,4<\/sup> <\/span><span class=\"s2\"><b>FIGURE 1<\/b><\/span><span class=\"s1\"> illustrates the basic pathophysiology of OA.<\/span><\/p>\n<div id=\"attachment_21277\" style=\"width: 838px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2020\/06\/TVP_2020_0708_Carprofen_Fig1A.jpg\"><img fetchpriority=\"high\" decoding=\"async\" aria-describedby=\"caption-attachment-21277\" class=\"wp-image-21277 size-full\" src=\"https:\/\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2020\/06\/TVP_2020_0708_Carprofen_Fig1A.jpg\" alt=\"Comparative image of a normal synovial join for a dog and a synovial join for a dog affected by osteoarthritis, which is often managed with carprofen\" width=\"828\" height=\"625\" srcset=\"https:\/\/navc.sitepreview.app\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2020\/06\/TVP_2020_0708_Carprofen_Fig1A.jpg 828w, https:\/\/navc.sitepreview.app\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2020\/06\/TVP_2020_0708_Carprofen_Fig1A-300x226.jpg 300w, https:\/\/navc.sitepreview.app\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2020\/06\/TVP_2020_0708_Carprofen_Fig1A-768x580.jpg 768w\" sizes=\"(max-width: 828px) 100vw, 828px\" \/><\/a><p id=\"caption-attachment-21277\" class=\"wp-caption-text\">Figure 1. The molecular and biomechanical pathophysiology of osteoarthritis in dogs and humans is very similar, characterized by breakdown of joint cartilage and inflammation within the synovial joint. (A) Diagram of normal versus osteoarthritic joint anatomy. Note the roughened surface of the articular cartilage, the thickened synovium and articular capsule, and the formation of bone spurs (osteophytes) on the osteoarthritic side. Illustration: Kip Carter.<\/p><\/div>\n<div id=\"attachment_21278\" style=\"width: 1090px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2020\/06\/TVP_2020_0708_Carprofen_Fig1B.jpg\"><img decoding=\"async\" aria-describedby=\"caption-attachment-21278\" class=\"size-full wp-image-21278\" src=\"https:\/\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2020\/06\/TVP_2020_0708_Carprofen_Fig1B.jpg\" alt=\"\" width=\"1080\" height=\"472\" srcset=\"https:\/\/navc.sitepreview.app\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2020\/06\/TVP_2020_0708_Carprofen_Fig1B.jpg 1080w, https:\/\/navc.sitepreview.app\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2020\/06\/TVP_2020_0708_Carprofen_Fig1B-300x131.jpg 300w, https:\/\/navc.sitepreview.app\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2020\/06\/TVP_2020_0708_Carprofen_Fig1B-1024x448.jpg 1024w, https:\/\/navc.sitepreview.app\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2020\/06\/TVP_2020_0708_Carprofen_Fig1B-768x336.jpg 768w\" sizes=\"(max-width: 1080px) 100vw, 1080px\" \/><\/a><p id=\"caption-attachment-21278\" class=\"wp-caption-text\">Figure 1. (B) Degradation products from breakdown of the articular cartilage cause macrophages and synovial fibroblasts to produce proinflammatory mediators (e.g., interleukin-12 [IL-12], CXCL13), which activate T and B cells. Proinflammatory mediators produced by the inflamed synovium (patchy synovitis) contribute to further cartilage degradation and are important therapeutic targets. Illustration: Kip Carter.<\/p><\/div>\n<h2 class=\"p2\">Evidence of Effectiveness of Carprofen for Dogs<\/h2>\n<p class=\"p1\"><span class=\"s1\">Clinical trials using both subjective and objective analysis have demonstrated improvement in limb function with the use of carprofen in dogs with naturally occurring OA.<sup>4,5<\/sup> Additionally, one study looked at the effect of carprofen on structural changes to the subchondral bone and found that it may be helpful in slowing or preventing abnormal metabolism of subchondral osteoblasts in the OA model.<sup>6<\/sup> The same study also found that carprofen may be helpful in reducing the severity of cartilage lesions.<sup>6<\/sup> However, NSAIDs have also been associated with chondrotoxicity.<sup>7<\/sup><\/span><\/p>\n<h2 class=\"p2\">Carprofen Mechanism of Action<\/h2>\n<p class=\"p1\"><span class=\"s1\">Carprofen is certainly not a new drug, having been approved in 1996 under the brand name Rimadyl (Zoetis, <\/span><a href=\"http:\/\/zoetis.com\"><span class=\"s2\">zoetis.com<\/span><\/a><span class=\"s1\">). Several generic options are now available. Carprofen was approved by the U.S. Food and Drug Administration for the relief of pain and inflammation in dogs and is shown to be clinically effective for the relief of signs associated with osteoarthritis in dogs.<sup>8<\/sup> <\/span><\/p>\n<p class=\"p1\"><span class=\"s1\">Carprofen is a non-narcotic NSAID with both analgesic and antipyretic properties. As with most NSAIDs, carprofen works by inhibiting cyclooxygenase (COX) enzymes (selectively inhibiting COX-2 over COX-1; <span class=\"s2\"><b>FIGURE<\/b><\/span><\/span><span class=\"s2\"><b>\u00a02<\/b><\/span><span class=\"s1\">), thereby inhibiting the release of several prostaglandins involved in chronic inflammatory reactions that are thought to be present in canine OA.<sup>8<\/sup> <\/span><\/p>\n<p><a href=\"https:\/\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2020\/06\/TVP_2020_0708_Carprofen_Fig2.jpg\"><img decoding=\"async\" class=\"size-full wp-image-21279\" src=\"https:\/\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2020\/06\/TVP_2020_0708_Carprofen_Fig2.jpg\" alt=\"\" width=\"1933\" height=\"1833\" srcset=\"https:\/\/navc.sitepreview.app\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2020\/06\/TVP_2020_0708_Carprofen_Fig2.jpg 1933w, https:\/\/navc.sitepreview.app\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2020\/06\/TVP_2020_0708_Carprofen_Fig2-300x284.jpg 300w, https:\/\/navc.sitepreview.app\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2020\/06\/TVP_2020_0708_Carprofen_Fig2-1024x971.jpg 1024w, https:\/\/navc.sitepreview.app\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2020\/06\/TVP_2020_0708_Carprofen_Fig2-768x728.jpg 768w, https:\/\/navc.sitepreview.app\/todaysveterinarypractice.com\/wp-content\/uploads\/sites\/4\/2020\/06\/TVP_2020_0708_Carprofen_Fig2-1536x1457.jpg 1536w\" sizes=\"(max-width: 1933px) 100vw, 1933px\" \/><\/a><\/p>\n<h2 class=\"p2\">Carprofen Dosage for Dogs<\/h2>\n<p class=\"p1\"><span class=\"s1\">Carprofen\u2019s labeled dose is 4.4 mg\/kg PO q24h or divided into 2 daily doses of around 2.2 mg\/kg q12h.<sup>8<\/sup> While the package insert recommends use of the \u201clowest effective dose for shortest duration consistent with individual response,\u201d animal studies were carried out for only 42 consecutive days without significant adverse effects.<sup>8<\/sup> Therefore, chronic use of carprofen for OA pain warrants monitoring for long-term side effects, which should include a complete metabolic panel to assess changes in renal and hepatic function.<sup>8<\/sup> Dose adjustments and discontinuation may be considered based on results. Dose or frequency reduction may be warranted if any indication of hepatic impairment (such as low albumin) is found.<\/span><\/p>\n<h2 class=\"p2\">Carprofen Pharmacokinetics<\/h2>\n<p class=\"p1\"><span class=\"s1\">Carprofen has high oral bioavailability (90%). Peak plasma concentrations are reached 1 to 3 hours after oral administration; the half-life has been shown to be approximately 8 hours.<sup>8<\/sup> Carprofen is metabolized via glucuronidation in the liver and is eliminated in feces (70% to 80%) and urine (10% to 20%). However, some enterohepatic recycling is expected.<sup>8,9 <\/sup><\/span><\/p>\n<h2 class=\"p2\">Adverse Effects, Safety, and Drug Interactions for Carprofen in Dogs<\/h2>\n<p class=\"p1\"><span class=\"s1\">While carprofen\u2019s COX-2 inhibition is effective in reducing inflammation, prostaglandins synthesized via COX-1 are necessary for normal gastrointestinal (GI) and renal functioning. Therefore, despite carprofen\u2019s selectivity for COX-2, its use has been associated with renal and GI toxicosis in the form of vomiting, diarrhea, inappetence, and, in severe cases, melena, GI\u00a0ulceration, and GI bleeding.<sup>8<\/sup> A new analgesic agent of the \u201cpriprant\u201d class works further down the pain cascade to inhibit a prostaglandin receptor thought to be specific to OA, thereby theoretically avoiding adverse effects of COX inhibition (<span class=\"s2\"><b>FIGURE<\/b><\/span><\/span><span class=\"s2\"><b>\u00a02<\/b><\/span><span class=\"s1\">). For more information on this drug, please see the article \u201c<a href=\"https:\/\/todaysveterinarypractice.com\/grapiprant-for-control-of-osteoarthritis-pain-in-dogs\/\">Grapiprant for Control of Osteoarthritis Pain in Dogs<\/a>\u201d in the <a href=\"https:\/\/todaysveterinarypractice.com\/table-of-contents-september-october-2019\/\">September\/October 2019<\/a> issue of TVP. <\/span><\/p>\n<p class=\"p1\"><span class=\"s1\">Idiosyncratic hepatotoxicity has been reported in Labrador retrievers receiving carprofen at recommended doses.<sup>10<\/sup> In these cases, the use of carprofen could not be definitively determined as the cause for increases in liver enzymes. In a study of 750 dogs, 1 Labrador retriever and 1 golden retriever showed signs of liver toxicosis that resolved after discontinuation, but 1 of the 2 dogs required intensive care.<sup>5<\/sup> Additionally, clinical field studies report alanine aminotransferase and aspartate aminotransferase increases in 5.4% and 2.3% of dogs, respectively.<sup>8<\/sup> Consequently, monitoring of hepatic function may also be warranted in some patients, especially large-breed dogs.<sup>8,10,11 <\/sup><\/span><\/p>\n<p class=\"p1\"><span class=\"s1\">While the manufacturer\u2019s package insert does not specifically list drug interactions, concomitant use of carprofen with other NSAIDs, corticosteroids, or other ulcerogenic drugs should be avoided due to increased risk of GI ulceration. Additionally, care should be taken to review and monitor efficacy and side effects when carprofen is given with other highly protein-bound drugs.<sup>8<\/sup><\/span><\/p>\n<p class=\"p1\">When carprofen is being dispensed, a client information sheet should be provided along with verbal counseling on potential adverse effects and discussion of monitoring parameters. Clients should be counseled to contact their veterinarian if they observe any adverse effects.<sup>12<\/sup><\/p>\n<h2 class=\"p2\">Combination of Carprofen With Adjunctive Agents<\/h2>\n<p class=\"p1\"><span class=\"s1\">NSAIDs are the treatment of choice for pain associated with OA. However, a review of clinical studies suggests that carprofen (or any NSAID) alone still fails to provide complete pain relief.<sup>13<\/sup> Therefore, it is often necessary to look to adjunctive agents that can be used concomitantly with carprofen to improve clinical efficacy. These agents may be of particular use in canine OA patients, which are commonly older and have comorbidities that limit the use of NSAIDs.<\/span><\/p>\n<h3 class=\"p3\">Amantadine<\/h3>\n<p class=\"p1\"><span class=\"s1\">Amantadine is an antiviral agent that has been used in humans for other indications (e.g., Parkinson\u2019s disease) due to its effect on the dopaminergic system. Amantadine is an <i>N<\/i>-methyl-D-aspartate (NMDA) receptor antagonist that is thought to work by blocking the binding of glutamate or aspartate to this receptor, thereby potentially inhibiting neurobiologic changes brought on by chronic inflammation and neuropathic pain.<sup>13<\/sup> Amantadine has been shown to reduce experimental sensitization in chronic back pain in humans.<sup>13<\/sup><\/span><\/p>\n<p class=\"p1\"><span class=\"s1\">In dogs, amantadine in combination with meloxicam statistically improved pain scores and physical activity significantly compared to meloxicam alone, but only after 21 days of treatment. This study suggests that amantadine is a reasonable adjunct to carprofen therapy to improve function through added pain relief in dogs with NSAID-refractory osteoarthritic pain.<\/span><\/p>\n<h3 class=\"p3\">Hyaluronan\/Glycosaminoglycan<\/h3>\n<p class=\"p1\"><span class=\"s1\">Hyaluronan, or hyaluronic acid (HA), is a glycosaminoglycan that is a main component of synovial joint fluid. It inhibits inflammatory cytokines and prostaglandins in synoviocytes. When HA is administered intra-articularly, the desired clinical effect is pain relief and disease-modifying activity.<sup>14<\/sup> When administered with carprofen, HA may also help to counteract the chondrotoxic effects of carprofen. In fact, HA given with carprofen was shown to cause less destruction of collagen structure compared with carprofen alone.<sup>14 <\/sup><\/span><\/p>\n<h3 class=\"p3\">Fish Oil (Omega-3 Fatty Acid)<\/h3>\n<p class=\"p1\"><span class=\"s1\">Studies have demonstrated improved weightbearing and clinical outcomes with dietary supplementation with omega-3 fatty acids alone. A study done to determine the effects of omega-3 fatty acids on carprofen dosage in dogs with OA found that dogs receiving a diet supplemented with 3.5% omega-3 fatty acids were able to reduce carprofen doses significantly faster than dogs receiving carprofen only.<sup>15<\/sup> This finding could be important in the general canine OA population to possibly reduce adverse effects associated with long-term use.<\/span><\/p>\n<div class=\"su-box su-box-style-default .content-box-blue { background-color: #F0F8FF; border-left: 8px solid #CEE1EF; font-size: 18px; }\" id=\"\" style=\"border-color:#003d45;border-radius:3px;\"><div class=\"su-box-title\" style=\"background-color:#007078;color:#ffffff;border-top-left-radius:1px;border-top-right-radius:1px\">Carprofen at a Glance<\/div><div class=\"su-box-content su-u-clearfix su-u-trim\" style=\"border-bottom-left-radius:1px;border-bottom-right-radius:1px\"><\/p>\n<ul>\n<li><strong>Mechanism of action:<\/strong> Inhibition of cyclooxygenase enzymes (selectively inhibiting COX-2 over COX-1), thereby inhibiting the release of several prostaglandins involved in chronic inflammatory reactions associated with canine osteoarthritis<\/li>\n<li><strong>Adverse effects:<\/strong> Gastrointestinal effects such as vomiting, diarrhea, and inappetence are common. More serious adverse effects are possible.<\/li>\n<li><strong>Drug interactions:<\/strong> Should not be used in conjunction with corticosteroids or other NSAIDs<\/li>\n<li><strong>Adjunct agents:<\/strong> Amantadine, hyaluronic acid, omega-3 fatty acids<\/li>\n<\/ul>\n<p><\/div><\/div>\n<h2 class=\"p2\">Conclusion<\/h2>\n<p class=\"p1\"><span class=\"s1\">Overall, carprofen is effective in reducing pain in dogs with OA. However, additional benefit can be seen with adjunctive agents. Care should be taken to monitor for signs of adverse effects from the use of carprofen. Clients should be counseled regarding risk reduction with use of this drug, including giving carprofen with food to reduce the risk of GI effects and providing access to plenty of water to reduce risk of renal toxicosis. Clients should be reminded to contact their veterinarian immediately in the event of signs of adverse effects. <\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Carprofen for dogs with osteoarthritis has been shown to reduce pain, and additional benefits can be seen with the use of adjunctive agents.<\/p>\n","protected":false},"author":9,"featured_media":21174,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"iawp_total_views":10433,"footnotes":""},"categories":[328],"tags":[13],"class_list":["post-21276","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-july-august-2020","tag-peer-reviewed","column-focus-on-pharmacology","clinical_topics-pain_management","clinical_topics-pharmacology"],"acf":{"hide_sidebar":false,"hide_sidebar_ad":false,"hide_all_ads":false},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.7 (Yoast SEO 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