Tramadol References
Int J Clin Pract. 1998 Mar;52(2):115-21.
Treatment of pain with sustained-release tramadol 100, 150, 200 mg: results of a post-marketing surveillance study.
Nossol S, Schwarzbold M, Stadler T.
Medical Scientific Division, Grunenthal GmbH, Stolberg, Germany.
In a post-marketing-surveillance study the use of a sustained-release tramadol preparation (Tramal long 100, 150, 200 mg) was investigated in 3153 patients. The intention was to comply with the legal obligation to carry out product surveillance and to collect data on prescribing behaviour. We focused our attention on drug safety and efficacy. Tramal long was used mainly for severe and very severe pain. The most frequently reported causes of pain were diseases of the locomotor system (49.9%), tumours (24.3%), traumas and fractures (10.1%), and neurogenic (9.3%). The mean daily dose was 235.7 mg, usually divided into two doses. The analgesic effect was described as very good or good by 82.5% of the patients. Adverse events occurred in 6.5% of the patients, mostly in the form of typical opioid side-effects such as nausea (3.4%), dizziness (1.5%) and vomiting (1.1%). Severe or unknown side-effects were not reported.
Online source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=9624795&dopt=Abstract Tramadol online, Ultram
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A new simple behavioral method was used for the evaluation of the anti-hyperalgesic properties of tramadol in the rat. At the lowest dose (1.25 mg/kg i.p.), tramadol did not modify thermal nociceptive thresholds, but it was able to prevent and block thermal hindpaw hyperalgesia induced by the tail injection of formalin. Our results provide evidence that tramadol blocks hyperalgesic behaviors without altering nociception, suggesting that this analgesic drug might represent a valid agent against central sensitization. Copyright 1998 Elsevier Science B.V. All rights reserved.
Online source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=9630602&dopt=Abstract Tramadol online, Ultram
Eur J Pain. 1998;2(4):343-350.
Interactions in the antinociceptive effect of tramadol in mice: an isobolographic analysis.
Pinardi G, Pelissier T, Miranda HF.
Department of Pharmacology, Faculty of Medicine
Tramadol is a widely-used analgesic for pre- and post-operative pain which has a different pharmacological profile to that of classical opioids, since it does not induce respiratory depression, constipation, sedation, tolerance or dependence. However, tramadol frequently produces nausea and vomiting as side-effects. In the present study, the interactions between tramadol and several adrenergic and serotonergic compounds with antinociceptive activity were studied by isobolographic analysis. Antinociceptive activity was evaluated using the acetic acid writhing test in mice. Dose-response curves for the antinociceptive effect of tramadol, prazosin, clonidine, xylamine, clomipramine and cyproheptadine were obtained, and ED(50)s were calculated for isobolographic analysis, which was performed by administration of fixed-ratios of tramadol with each of these drugs, given both systemically and intrathecally. The isobolograms of all combinations tested, either systemically or intrathecally showed superadditivity. The synergies observed with these combinations suggest a complex modulation of the descending noradrenergic and serotonergic systems that exert inhibitory influences on the transmission of nociceptive information, probably in addition to effects on receptors in the primary neurons of the spinal cord. The co-administration of analgesic drugs that produce superadditive effects constitutes a significant new avenue for the treatment of pain, since a similar level of antinociception can be obtained with considerable reductions in the dose of each analgesic. Copyright 1998 European Federation of Chapters of the International Association for the Study of Pain.
Online source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10700329&dopt=Abstract Tramadol online, Ultram [PubMed - as supplied by publisher]
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