• Proceedings of the Korean Society of Applied Pharmacology
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• 1994.04a
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• pp.285-285
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• 1994

Naproxen을 개의 정맥내 투여하였을때 뇨량의 감소와 더불어 삼투질제거율(Cosm), 뇨중 $Na^{+}$과 $K^{+}$의 배설율( $E_{Na}$ , $E_{k}$ )의 감소와 신세뇨관에서의 $Na^{+}$과 $K^{+}$의 재흡수율( $R_{Na}$ , $R_{k}$ )과 K/Na비의 증대를 나타내었으며 신혈류량(RPF)이 감소하였다. 한쪽 신동맥내에 naproxen을 투여하였을때 투여신(실험신)에서의 이뇨작용과 대조신에서의 항이뇨작용을 나타내었다. 경동맥에 naproxen을 투여하였을때도 뚜렷한 항이뇨작용을 나타내었다. 이와같은 두경우에서의 항이뇨 작용시의 신기능변화는 정맥내 naproxen의 경우와 같은 양상을 나타내었다. 경동맥내의 naproxen의 항이뇨작용은 신신경 제거에 의하여 영향을 받지 않았으나 정맥내로의 arachidonic acid나 indomethacin의 전처리에 의하여서는 나타나지 않았다. 경동맥내의 naproxen은 정맥내의 spironolactone의 이뇨작용을, 정맥내의 spironolactone은 경동맥내의 naproxen의 항이뇨작용을 억제하였다. 이상의 결과로 보아 naproxen은 중추성 항이뇨작용과 $Na^{+}$저류를 나타내며 이는 prostaglasdin의 합성억제와 aldosterone양 작용에 의하는 것으로 사료된다.

• Journal of Microbiology and Biotechnology
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• v.26 no.5
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• pp.823-828
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• 2016

The present study investigated the protective effect of naturally purified 4-(3,4-dihydroxyphenyl)-3-buten-2-one (DHP) from Phellinus linteus against naproxen-induced gastric antral ulcers in rats. To verify the protective effect of DHP on naproxen-induced gastric antral ulcers, various doses (1, 5, and 10 μg/kg) of DHP were pretreated for 3 days, and then gastric damage was caused by 80 mg/kg naproxen applied for 3 days. DHP prevented naproxen-induced gastric antral ulcers in a dose-dependent manner. In particular, 10 μg/kg DHP showed the best protective effect against naproxen-induced gastric antral ulcers. Moreover, DHP significantly attenuated the naproxen-induced lipid peroxide level in gastric mucosa and increased the activities of radical scavenging enzymes, such as superoxide dismutase, catalase, and glutathione peroxidase, in a dose-dependent manner. A histological examination clearly demonstrated that the gastric antral ulcer induced by naproxen nearly disappeared after the pretreatment of DHP. These results suggest that DHP can inhibit naproxen-induced gastric antral ulcers through prevention of lipid peroxidation and activation of radical scavenging enzymes.

• YAKHAK HOEJI
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• v.39 no.3
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• pp.314-328
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• 1995

This study was attempted to investigate the mechanism of retention of sodium and water by naproxen which is a drug among nonsteroidal anti-inflammatory drugs in dogs. Napoxen, when given intravenously in doses ranging from 30 mg to 100 mg/kg, elicited antidiuresis accompanied vath the decrease of osmolar clearance(Cosm) and amounts of sodium excreted in urine(E$_{Na}$), with the increase of sodium reabsorption rate in renal tubule(R$_{Na}$) and ratio of potassium against sodium (K/Na). Naproxen infused into a renal artery in doses ranging from 1.0mg to 3.0mg/kg/min produced both diuretic action in infused kidney and antidiuretic action in control kidney. Naproxen injected into carotid artery in doses ranging from 10.0 mg to 30.0 mg/kg exhibited antidiuretic action. Changes of renal function in the circumstances of above two antidiuresis were the same with aspect of intravenous naproxen. Antidiuretic action of naproxen injected into carotid artery was not affected by renal denervation, was blocked by pretreatment with i.v. arachidonic acid, prostaglandin precursor, or i.v. indomethacin, cyclooxygenase inhibitor. Naproxen injected into carotid artery abolished the diuretic action of i.v. spironolactone, aldosterone antagonist, and i.v. spironolactone blocked the antidiuretic action of naproxen given into carotid artery. The results suggest that naproxen produced antidiuresis, and sodium and water retention through the central system, the mechanism being related to the prostaglandin biosynthetic inhibition and aldostercfne like action.

• YAKHAK HOEJI
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• v.30 no.3
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• pp.128-138
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• 1986

Three newly synthesized alkanol esters of d-2-(6-methoxy-2-naphthyl) propionic acid, NAPROXEN were examined for physicochemical properties and biopharmaceutical characteristics. These esters were very stable in solid state, but more than 90% of these esters were hydrolysed to the parent, naproxen in rabbit's liver hornogenates. They showed higher dissolution rate in the artificial gastric and intestinal juice, and significantly greater partition coefficient in n-octanol, when compared with naproxen. The absorption rate constants of these esters were increased, while the elimination rate constants were decreased, comparing with naproxen. The ulcerogenic doses on gastric and intestinal mucosa were increased remarkably, and the antiinflammatory dose against carrageenininduced edema on rat hind paw was decreased markedly in these esters, and thus the safety indexes of these esters were higher than that of naproxen.

• YAKHAK HOEJI
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• v.31 no.1
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• pp.25-32
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• 1987

The effect of loading dose, plasticiser and PVA molecular weight on naproxen release from hydrophilic polymer matrix was examined. Hydrophilic polymer matrix was prepared with PVA and PVP by adding glycerine as plasticiser. The release of naproxen from polymer matrix was determined in phosphate buffer medium. The release rate of naproxen from the polymer matrix increased as drug loading dose and plasticiser percentage increased. Raproxen released from the polymer matrix showed the time square root kinetics. Without changing the release-pattern, the release rate of naproxen could not be changed by varying molecular weight of PVA. Linearly released time range increased as drug loading dose increased, whereas decreased as plasticiser percentage increased up to 30%.

• The Korean Journal of Pain
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• v.19 no.2
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• pp.285-287
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• 2006

Hundreds of drugs have been implicated as the causes of antibody-mediated thrombocytopenia. Naproxen is a commonly used nonsteroidal anti-inflammatory drug, and it is generally considered to be safe with few hematological side effects such as thrombocytopenia. In this case, severe thrombocytopenia associated with petechia and epistaxis appeared after initiation of naproxen therapy in the 59-year-old man. We report here on a case of severe thrombocytopenia that was recognized at 10 days after the use of naproxen, and the patient rapidly recovered to a normal platelet count without bleeding symptoms or any complications, although immunoglobulin or steroid was not used.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• v.27 no.1
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• pp.69-77
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• 2001

PURPOSE : The Purpose of this study was to investigate the anti-inflammatory effect on combination dosage of dexamethasone and naproxen after removal of impacted 3rd molars. We evaluated postoperative pain, swelling, and mouth opening limitation quantitatively. PATIENTS AND METHODS : Removal of an impacted lower third molar was done under local anesthesia with 2% lidocaine to 239 healthy patients. We randomly gave experimental group 1.5mg dexamethasone and 200mg naproxen three times a day for postoperative 2days, and also gave control group 200mg naproxen alone three times a day for postoperative 2days. Swelling and pain were measured by visual analogue scale (VAS). Mouth opening limitation was measured by maximum interincisal opening length. We estimated these measurements in the first and second postoperative days. Differences between experimental and control group were investigated considering age, sex, BMI(body mass index), impacted type, surgical site(right or left), and operation time by independent student T-test. RESULTS : In general, swelling, pain, and mouth opening limitations were significantly reduced (p<0.01) by combination dose of dexamethasone and naproxen in postoperative one day. But there was no difference in pain on the second postoperative day. As variables being considered, in the postoperative pain, there was significant difference between experimental group and control group in only male, little bony removal group, left side extraction group. In case of postoperative swelling, there was no significant differences in male, adolescence, long operating time group (over 20 minutes), medium BMI group and right side extraction group. In case of postoperative mouth opening limitation, there was significant difference between only female and long operating time group (over 20 minutes). CONCLUSION : Variables being considered, postoperative swelling was more reduced by the combination dose of naproxen and dexamethasone than that of naproxen alone after removal of impacted 3rd molars. But there was varoius results in pain and mouth opening limitation.

• YAKHAK HOEJI
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• v.30 no.3
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• pp.121-127
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• 1986

Three new alkanol esters of d-2-(6-methoxy-2-naphthyl)propionic acid, NAPROXEN were synthesized by esterification of sodium naproxen with chloralcohols, such as 2-chloroethanol, 3-chloro-1, 2-propanediol and $\beta$-chloroethoxyethanol in dimethylformamide. These new esters were obtained with comparably high yield and identified by elemental analysis, UV, IR and NMR techniques.

• Journal of Korean Society of Environmental Engineers
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• v.31 no.10
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• pp.831-838
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• 2009

In order to evaluate a removal characteristic of diclofenac, ibuprofen and naproxen by oxidizing agents, $Cl_2,\;O_3$ and $O_3/H_2O_2$ are used as oxidants in this study. In case of that $Cl_2$ is used for oxidizing pharmaceuticals, ibuprofen is not removed entirely at $Cl_2$ dose range of 0.5~5.0 mg/L for 60 minutes, however, removal tendency of diclofenac and naproxen are so obviously at $Cl_2$ dose higher than 0.5 mg/L. In addition, as $Cl_2$ dose and contact time are increased, the removal rate of diclofenac and naproxen is enhanced. When $O_3$ is used as oxidizing agent, ibuprofen is not eliminated at $O_3$ dose range of 0.2~5.0 mg/L. On the contrary, 72~100% of diclofenac and 49~100% of naproxen are removed at $O_3$ dose of 0.2~5.0 mg/L. From experiments using $O_3/H_2O_2$ as an oxidant, we can find that $O_3/H_2O_2$ is much more effective than $O_3$ only for removal of diclofenac and naproxen. Moreover, the efficiency is raised according to increase of $H_2O_2$ dose, however, experiments using $O_3/H_2O_2$ show that oxidation of pharmaceuticals is less effective as $H_2O_2$ to $O_3$ ratio increased to above approximately 1.0. On reaction rate constant and half-life of diclofenac, ibuprofen and naproxen depending on $Cl_2$, $O_3$ and $O_3/H_2O_2$ dose, an oxidation of pharmaceuticals by $Cl_2$ and $O_3$ particularly has a comparatively high reaction rate constant and short half-life comparing $O_3/H_2O_2$. From above results, we can fine that diclofenac and naproxen can be easily eliminated in oxidation processes.

• Journal of Microbiology and Biotechnology
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• v.15 no.3
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• pp.633-639
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• 2005

Frequently used for humans as a nonsteroidal anti-inflammatory drug, naproxen has been known to induce ulcerative gastric lesions. The present study was undertaken to investigate the in vivo therapeutic effect of astaxanthin, isolated from a Xanthophyllomyces dendrorhous mutant, against naproxen-induced gastric antral ulceration in rats. The rats were treated with three doses of astaxanthin [1, 5, and 25 mg/kg body weight (B.W.), respectively] once daily for 2 weeks after pretreatment of 80 mg of naproxen/kg B.W. twice daily for 3 days, while the control rats received only 80 mg of naproxen/kg B.W. twice daily for 3 days. The oral administration of astaxanthin (1,5, and 25 mg/kg B.W.) showed a curative effect against naproxen (80 mg/kg B.W.)-induced gastric antral ulcer and reduced the elevated lipid peroxide level in gastric mucosa. In addition, astaxanthin treatment resulted in significant increase in the activities of radical scavenging enzymes such as superoxide dismutase, catalase, and glutathione peroxidase. A histologic examination clearly proved that acute gastric mucosal lesion induced by naproxen nearly disappeared after the astaxanthin treatment. These results suggest that astaxanthin eliminated the lipid peroxides and free radicals induced by naproxen and may be a potential candidate for remedy of gastric ulceration.