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Chronic headaches are difficult to treat and represent the biggest challenge in headache centres. Mirtazapine has a prophylactic and ibuprofen an acute effect in tension-type headache. Combination therapy may increase efficacy and lower side effects. We aimed to evaluate the prophylactic effect of a combination of low-dose mirtazapine and ibuprofen in chronic tension-type headache. Ninety-three patients were included in the double-blind, placebo-controlled, parallel trial. Following a 4-week run-in period they were randomized to four groups for treatment with a combination of mirtazapine 4.5 mg and ibuprofen 400 mg, placebo, mirtazapine 4.5 mg or ibuprofen 400 mg daily for 8 weeks. Eighty-four patients completed the study. The primary efficacy parameter, change in area under the headache curve from run-in to the last 4 weeks of treatment, did not differ between combination therapy (190) and placebo (219), P = 0.85. Explanatory analyses revealed worsening of headache already in the third week of treatment with ibuprofen alone. In conclusion, the combination of low-dose mirtazapine and ibuprofen is not effective for the treatment of chronic tension-type headache. Moreover, the study suggests that daily intake of ibuprofen worsens headache already after few weeks in chronic tension-type headache. 相似文献
3.
Evans A. M. Nation R. L. Sansom L. N. Bochner F. Somogyi A. A. 《European journal of clinical pharmacology》1989,36(3):283-290
Summary We have developed a novel and reproducible method for determining the plasma protein binding of the two ibuprofen enantiomers in the presence of each other. The method involves the use of radiolabelled racemic ibuprofen, equilibrium dialysis, derivatization of the enantiomers to diastereomeric amides, high-performance liquid chromatography, and radiochemical analysis.We have determined the plasma protein binding of R(–)- and S(+)-ibuprofen in 6 healthy male volunteers after the oral administration of 800 mg racemic ibuprofen.The mean time-averaged percentage unbound of the R(–)-enantiomer, 0.419 was significantly less than that of the S(+)-enantiomer, 0.643, consistent with stereoselective plasma protein binding.The percentage unbound of each ibuprofen enantiomer was concentration-dependent over the therapeutic concentration range and was influenced by the presence of its optical antipode. 相似文献
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Nelson K. S. Khoo Francis P. H. Chan Mary Nel Saarloos Peeyush K. Lala 《Clinical & experimental metastasis》1992,10(4):239-252
In this study the efficacy of treatment of two cyclo-oxygenase inhibitors, ibuprofen (Ibu) and indomethacin (Indo), are compared in the immunotherapy of metastasis designed to reverse prostaglandin E2 (PGE2)mediated inactivation of interleukin-2 (IL-2)-dependent host killer cell lineages. These agents were tested either alone for the prevention of metastasis or in combination with IL-2 for the eradication of established metastasis. C3H/HeN mice were placed on chronic oral Ibu (CIbT; 200 and 600 ,g/ml of water) or Indo (CIT; 10 g/ml) 5 days after s.c. transplantation of 5 × 105 metastatic C3L5 mammary carcinoma for the prevention of spontaneous lung metastases. They showed intolerance to Indo at a dosage of 14 g/ml, which was well tolerated by other mouse strains in previous studies, but tolerated the Ibu dosages used. Control and treated mice were killed on day 30 to score metastatic lung colonies, to evaluate killer activity in splenocytes against natural killer (NK)-sensitive YAC-1 lymphoma or NK-resistant C3L5 adenocarcinoma and 8911 lymphoma targets, and to phenotype the surface markers of killer cells. CIbT and CIT alone at the above dosage significantly reduced the number of lung colonies, retarded local tumor growth and restored NK activity of splenic killer cells expressing AGM-1+, Thy-1–, Lyt-2– phenotype. To treat established lung metastasis, mice bearing 15-day C3L5 transplants were given CIbT or CIT alone or in combination with two 4-day rounds (days 20–23, 31–34) of IL-2 (15 000 Cetus units, i.p. every 8 h) and were killed on day 35 to score lung colonies and characterize splenic killer cells. CIbT or CIT alone reduced the number of spontaneous lung metastases and restored anti-YAC-1 killer function of splenocytes with NK-like phenotype (AGM-1+, Thy-1–, Lyt-2–); some anti-C3L5 killer function was also generated in the high dose Ibu group and the killer cell showed AGM-1+, Thy-1+ and Lyt-2+ phenotype. Combined therapies with CIbT or CIT plus IL-2 were more effective in reducing metastases and promoting killer cell function, the best results being achieved with high dose Ibu + IL-2. All killer cells expressed AGM-1 and Thy-1. In addition, C3L5 killer cells also expressed Lyt-2, suggesting T-cell stimulation. PGE2 synthesis in the host was inhibited by at least 50% in mice subjected to CIbT or CIT. Thus, Ibu proved to be an excellent substitute for Indo in preventing metastasis and NK cell activation when given alone, and also in ameliorating established metastasis and activating lymphokine-activated killer cells when combined with IL-2. 相似文献
6.
William R. Gillespie Peter Veng-Pedersen 《Journal of pharmacokinetics and pharmacodynamics》1985,13(3):289-307
A new deconvolution algorithm (DCON) suitable for pharmacokinetic applications is presented. It requires that both the impulse and input responses, typically systemic drug levels, be well described by polyexponential equations. DCON has a wider range of applications than an earlier method (DECONV) from which it is derived. A FORTRAN program is provided, making implementation of the technique a simple matter. DCON is demonstrated to evaluate the GI bioavailability, defined as the rate and the extent of gastrointestinal drug release, of various ibuprofen dosage forms. The GI drug release kinetics exemplifies a pharmacokinetic system which cannot be evaluated using the previous deconvolution algorithm (DECONV) because of an initial zero drug level response. This limitation is not found in DCON. It is also demonstrated how the mean in vivo dissolution time MDT can be evaluated by deconvolution. 相似文献
7.
The anti-inflammatory activities of five different preparations of emu (Dromais Novae-Hollandiae) oil, applied topically, have been examined using an experimental polyarthritis- in rats. Four of the preparations were found
to be active against adjuvant-induced arthritis in rats. The efficacies of the emu oils acting transdermally are compared
with that of orally administered ibuprofen (40 mg/kg). 相似文献
8.
Certain delivery systems are intended to release the active ingredient in different phases to obtain the desired therapeutic effect. For these formulations, such as a bilayer tablet, it is desirable to distinguish and measure the release of drug from the different phases simultaneously. Mass spectrometric methods were developed to measure three ibuprofen isotopomers in serum and two in dissolution fluid. The analytical methods were linear (r 0.992) over the concentration range of interest and recovery was greater than 99.2% for all isotopomers. Coadministration of [2H0]ibuprofen, [2H4]ibuprofen, and [2H7]ibuprofen to male beagles demonstrated that the isotopomers were bioequivalent and verified the absence of any kinetic isotope effect due to deuterium incorporation (p = 0.286). These methods were then used to evaluate a bilayer tablet formulation composed of an immediate release layer of 100 mg [2H4]ibuprofen and a sustained release layer with a drug load of 300 mg [2H0]ibuprofen. Two different rate-controlling polymer matrices that provided similar in vitro dissolution profiles were compared in the sustained release phase, while the immediate release formulation remained the same. In male beagles, the HPMC matrix delivered a significantly greater amount of ibuprofen (p < 0.05). The AUC was threefold greater for HPMC (1067 ± 437 nmole * h/ml) versus EUDRAGIT® (320 ± 51), and Cmax was nearly four times greater (145 ± 62.1 nmole/ml for HPMC versus 37.9 ± 14.4 for EUDRAGIT®). Although Tmax for HPMC (3.4 ± 1.9 h) lagged behind EUDRAGIT® (2.0 ± 0.82 h), the difference was not significant (p > 0.05). The immediate release layer was absorbed to the same extent as an oral solution (containing [2H7]ibuprofen) that was administered concomitantly with the bilayer tablet. Using the stable isotope markers also demonstrated that the release rates of the two layers were independent of each other, both in vivo and in vitro. Stable isotope techniques are a useful tool in the development of biphasic release formulations since they can be used to determine proper drug load of each phase as well as the appropriate rate of release. 相似文献
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布洛芬缓释胶囊的人体相对生物利用度 总被引:3,自引:0,他引:3
目的:比较布洛芬缓释胶囊和芬必得胶囊的人体生物利用度。方法:用随机交叉试验设计,20名健康男性受试者口服单剂量和多剂量两种制剂600 mg,高效液相色谱法测定血清中布洛芬的浓度,计算两药的药代动力学参数。结果:受试者口服单剂量国产布洛芬缓释胶囊与芬必得胶囊后布洛芬的AUC_(0-24)分别为208.74±43.74和205.54±39.43 mg·h·L~(-1),t_(max)分别为4.85±0.81和5.20±1.06 h,C_(max)分别为25.40±4.00和25.47±4.50mg·L~(-1),以AUC_(0-24)计算,国产布洛芬缓释胶囊的相对生物利用度为(104.13±25.50)%。口服多剂量国产布洛芬缓释胶囊与芬必得胶囊后布洛芬的AUC~(ss)分别为170.81±24.87和172.93±29.76 mg·h·L~(-1),t_(max)分别为4.90±0.97和4.65±1.09 h,C_(max)分别为27.31±5.45和26.87±3.79 mg·L~(-1);C_(min)分别为6.13±1.60和5.94±1.84 mg·L~(-1),波动度分别为(146.45±36.69)%和(149.10±22.61)%。以AUC~(ss)计算,国产布洛芬缓释胶囊的相对生物利用度为(99.68±10.22)%。结论:国产布洛芬缓释胶囊与芬必得胶囊具有生物等效性。 相似文献