Tramadol
Tramadol is an opioid analgesic with a dual mechanism of action. It is a racemic mixture of trans isomers, showing significant differences from the standpoint of biochemical, pharmacological and metabolic between the two enantiomers. Tramadol is a synthetic analogue of codeine, with a lower affinity than that to opioid receptors. Tramadol has a much lower potential than other opioids to induce respiratory depression and dependence, but both effects may take place. Comparative studies with other analgesics have shown that tramadol is equivalent from the point of view painkiller codeine, but less potent than codeine association + hydrocodone + acetaminophen or paracetamol. Tramadol is effective as an adjunct to relieve pain in osteoarthritis in combination with anti-inflammatory drugs (NSAIDs). The World Health Organization classifies tramadol in step II to step pain ( * ). The absence of gastrointestinal effects and significant cardiovascular effects allow the tramadol may be a good alternative for people with arthritis who do not tolerate NSAIDs.
Tramadol in UK is effective in postoperative pain but can not be used as an adjunct to anesthesia due to its sedative properties and high incidence of postoperative respiratory depression observed in some cases.
Tramadol without prescription
Mechanism of action: Tramadol has a dual mechanism of pharmacological action. Buy cheap tramadol has an agonist activity on central ? opioid receptors although its affinity for these receptors is about 10 times less than codeine, 60 times lower than that of propoxyphene and 6,000 times lower than that of morphine. The M1 metabolite has an affinity for the ? receptor 4-200 times higher than the native tramadol. Opiate receptors are found coupled receptors G proteins function as positive or negative modulators of synaptic transmission via G proteins that activate protein afectoras. The opiate receptor agonists reduce intracellular cAMP by inhibiting adenylate cyclase which, in turn, modulates the release of nociceptive neurotransmitters such as substance P, dopamine, acetylcholine and noradrenaline. The end result is the inhibition of the nociceptive stimulus.
However, the analgesic effects of tramadol are not only due to its opioid agonist effects. An important contribution to the analgesic effects, but also its adverse effects, is blocking the synaptic reuptake of amines, similar to those caused by monoamine oxidase inhibitors. Tramadol inhibits reuptake of norepinephrine and serotonin in the central nervous system and thus prevents the transmission of pain through the spinal cord. These effects are quite significant in the overall analgesic effect of tramadol because naloxone can not completely reverse its analgesic effects. The stereochemistry of tramadol also influences its affinity for opioid receptors. The enantiomer (+) has a greater affinity for the ? opioid receptor inhibits the reuptake of serotonin and stimulates their release. The (-) enantiomer inhibits norepinephrine reuptake by stimulating 2-adrenergic receptors. The inhibitory effects of tramadol (racemate) on norepinephrine and serotonin are about 100-1000 times smaller than those of imipramine.
Pharmacokinetics: Lowest prices on tramadol is administered orally, rectally, intramuscular and intravenous. After oral administration, the drug is rapidly absorbed with a bioavailability of 68% initial reaches 100% after multiple doses. This increase in bioavailability is due to tramadol undergoes hepatic first-pass metabolism saturable. Bioavailability increases with age and decreases in patients with renal or hepatic failure. After intramuscular or rectal administration, the bioavailability is 100% and 78% respectively. The presence of food in the stomach does not affect the absorption of tramadol. The maximum concentrations of active metabolite of tramadol (M1) was obtained at 3 hours after an oral dose, although the drug is detectable native to 15-45 minutes and reaches its maximum at 2 hours. The maximum analgesic effect coincides with the maximum plasma concentrations of M1, and lasts for about 6 hours. The concentrations of equilibrium ("steady state") are reached within 2 days of starting treatment with multiple doses. Binding to plasma proteins is low (20%). The drug crosses the placental barrier and is excreted in breast milk at 0.1%
Tramadol undergoes hepatic metabolism of significant first step. First are the metabolites O-desmethyl and N-demethylated. This metabolism is stereoselective experiencing the enantiomer (-) a selective O-demethylation, while (+) enantiomer preferentially undergoes an N-demethylation. In a second phase, the O-demethylated metabolites are conjugated for disposal. Of the 11 identified metabolites of tramadol only the M1 metabolite (O-demethyltramadol) has analgesic activity that is apparently critical to the analgesia of tramadol. The cause demethylation of tramadol to M1 is dependent on the cytochrome P450 CYP2D6 and, therefore, those drugs that inhibit this system will reduce the analgesic efficacy and increase the side effects of tramadol own native (ie not metabolize). In normal adults, the elimination half-life of tramadol and metabolite M1 range between 5 and 7 hours. Both the native drug and its metabolites are primarily excreted in the urine (90%) appearing in the feces only 10% of the administered dose.
In patients with renal or hepatic dysfunction are required dose reductions. When creatinine clearance <80 ml / min, the half life of Tramadol without prescription increases 1.5 to 2 times compared with normal subjects. Similarly, in patients with liver dysfunction or cirrhosis, the half-life increases 2 or 3 times.
Treatment of moderate to moderately severe pain:
Oral administration:
Adults and adolescents> 16 years recommended initial doses of 25 mg once daily, which could be increased by increments of 25 mg every three days to reach 100 mg / day (ie, four doses of 25 mg per day .) Later, the dose can be increased by 50 mg / day (assuming they are well tolerated) every 3 days until the 200 mg / day (ie, four doses of 50 mg a day) even to the 400 mg / day divided in 4 times a day. Not recommended to move from the 400 mg per day.
Elderly> 75 years: initial dose should be 25 mg once daily, increasing it by increments of 25 mg every 3 days to reach 100 mg / day divided into 4 administrations. Later, these doses may be progressively increased in increments of 50 mg every 3 days to reach 200 mg / day (ie 50 mg four times daily). Not recommended to move from the 300 mg / day, administered in equal doses every 4 to 6 hours. Subjects between 65 and 75 years of age may be treated as younger adults unless they show kidney or liver failure.
These guidelines are the most appropriate treatment to minimize side effects, but pain relief is not immediately apparent. In the event that required a reduction in pain as quickly as possible, you can use the following guidelines:
Adults and adolescents> 16 years recommended doses of 50-100 mg every 4-6 hours, not to exceed 400 mg per day.
Elderly> 75 years: 50-100 mg every 4-hours, not to exceed 300 mg / day. Subjects between 65 and 75 years of age may be treated as younger adults unless they show hepatic or renal
Intravenous
Adults: 50-100 mg every 4-6 hours not to exceed 400 mg / day. The recommended dose is of 0.7 mg / kg per dose not exceeding 5.6 mg / kg / day
Children> 12 years: the recommended doses are 0.7 mg / kg / dose up to 5.6 mg / kg / day.
Intravenous administration (patient-controlled administration)
Adults have used a starting dose of 100 mg followed by additional 20 mg as demanded by the patient stops 5 minutes to a maximum of 500 mg in four hours during the first day of post-operative. Other schemes are described starting dose of 50-100 mg intravenously followed by an infusion of 2.2 mg / hour on-demand dose of 18.5 mg iv and stops for a minute (maximum dose 193 mg in one hour) or on-demand dose 9.6 mg to 1 minute stops simultaneously with an infusion at a rate of 1.15 mg / hour with a maximum of 100 mg / hour after a starting dose of 50-100 mg
Intramuscular
Adults: 50-100 mg every 6-8 hours. The maximum daily dose should not exceed 400 mg. In general recommended doses are 0.7 mg / kg / dose with a maximum of 5.6 mg / kg / day
Children> 12 years: the recommended doses are 0.7 mg / kg / dose with a maximum of 5.6 mg / kg / day
Rectal administration
Adults: 100 mg every 6-8 hours. The recommended doses are 1.4 mg / kg per dose with a maximum of 5.6 mg / kg / day
Adjuvant treatment of osteoarthritis:
Oral administration
Adults: 50-100 mg every 4-6 hours not to exceed 400 mg / day. The adjustment of the dose by small increments improving drug tolerability. Cheap Tramadol without prescription is effective in treating osteoarthritis pain in being able to associate with non-steroidal anti-inflammatory
Elderly> 75 years: 50-100 mg every 4-6 hours with a maximum of 300 mg / day PO.
Treatment of neuropathic pain:
Oral administration:
Adults: a placebo-controlled study in diabetic patients with diabetic neuropathy, average daily doses of 210 mg of Tramadol without prescription in divided doses produced significant relief of pain. In a study in patients with postherpetic neuralgia, a dose of 600 mg / day were comparable in efficacy to chlorpromazine + clomipramine, although the number of patients was too small to draw conclusions. In addition, many patients had to discontinue treatment under both medications due to side effects.
Treatment of restless legs syndrome:
Oral administration:
Adults: tramadol at doses of 50-150 mg / day for 15-24 months was effective in 10 of 12 patients
Treatment of postoperative shivering:
Adult doses were administered 1-2 mg / kg intravenous tremors have been eradicated in 5 minutes.
Maximum recommended doses:
Adults: 100 mg / dose up to 400 mg / day orally in divided doses
Aged 75 years 100 mg / dose to a maximum of 300 mg / day orally in divided doses
Aged 65-74 years: 100 mg / dose up to 400 mg / day orally in divided doses
Adolescents> 16 years: 100 mg / dose up to 400 mg / day orally in divided doses
Adolescents and children: they have not determined the maximum
Patients with renal impairment: A dose of 50 mg every 12 hours
Patients with renal insufficiency (CrCl <30 ml / min): the interval between doses should be increased to 12 hours. The maximum recommended dose should not exceed 200 mg / day orally
Use of tramadol is contraindicated in the case of acute intoxication by alcohol or other opioid agonists, hypnotics, centrally acting analgesics and psychotropic
Anaphylactic reactions were observed after the initial dose of tramadol online, especially in patients with a history of hypersensitivity to codeine. Tramadol is contraindicated in patients with hypersensitivity to the drug or any of its components and in patients who have shown prior hypersensitivity to codeine or other opioid drugs.
Tramadol should be administered with caution in patients with respiratory depression. This depression is possible when large doses of the drug or when used concomitantly with other drugs that cause depression of respiration. In the case of respiratory depression appeared, treated as an overdose but naloxone administered with caution because of possible risk of seizures.
Also be used tramadol with caution in patients at risk of seizures and patients with a history of epilepsy or treated with other drugs that lower the seizure threshold or under certain conditions (infections, increased intracranial pressure, etc). It is also important to note that Tramadol may mask symptoms of a head injury or increased intracranial pressure by reducing the pain and cause miosis.
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It can be difficult to assess the status of a patient with a gastrointestinal condition while under treatment with tramadol.
Nor is it recommended the administration of tramadol in patients with a history of drug addiction or drug abuse. It has been shown that administration of tramadol may re-start a physical dependence in patients who have been drug addicts. Although small and similar to codeine, tramadol has a potential to induce dependence due to the action of its metabolite M1 on ?-opioid receptors. For this reason, after chronic treatment with tramadol withdrawal should be gradual.
Tramadol should be administered with caution in patients with renal failure. Kidney failure affects the degree of removal of native tramadol online and its metabolite M1. We recommend a dose reduction when creatinine clearance is less than 30 ml / min. Keep in mind that it can take several days before toxicity is manifested by increased plasma concentrations. The same applies in cases of liver failure.
Patients older than 75 years tend to show decreased renal and hepatic functions, showing slightly higher concentrations and a half-lives slightly longer than younger patients, and therefore require lower doses of cheap tramadol .
Tramadol is classified in category C pregnancy risk. There have been no controlled studies reached in humans during pregnancy. Animal studies have shown that in high doses, this drug is embryotoxic and fetotoxic but not teratogenic effects were detected. All these effects occur at doses higher than those in the mother caused a more severe toxicity. Tramadol crosses the placental barrier in humans is unknown and may affect fetal development. Not recommended for tramadol before or during birth, although it has been used occasionally to relieve labor pains, without having seen any neonatal respiratory depression different from that observed with morphine or meperidine.
Have detected small amounts of best discount tramadol in human milk, although it is unknown the extent of this excretion or that way can affect the infant. Analgesic alternatives are recommended during lactation.
INTERACTIONS
Tramadol is metabolized primarily by cytochrome P450 isoenzyme CYP 2D6 and therefore require higher doses when administered with inducers of this enzyme. Some drugs that are inducers of CYP2D5 isoenzyme include carbamazepine, phenobarbital, phenytoin, and rifampin. For example, in a patient treated chronically with carbamazepine, the dose of tramadol required for acceptable analgesia may be higher than 800 mg / day, or more than double the normal dose
Anticonvulsants may contribute to the central nervous system depression caused by tramadol. In addition, tramadol may lower the seizure threshold in epileptic patients by interfering with the effect of these drugs. The administration of tramadol increases the seizure risk in patients treated with drugs that lower the seizure threshold and some antipsychotics, bupropion, cocaine, naloxone and some psychostimulants
Because price tramadol is metabolized by CYP 2D6, all agents that inhibit this enzyme system will reduce the metabolism of discount tramadol dismnuyendo levels of M1 and thus analgesic efficacy. In addition, native generic tramadol levels remain high for longer periods being more probable the occurrence of side effects due to it. Some drugs that inhibit CYP 2D6 are amiodarone, cimetidine, clomipramine, desipramine, fluphenazine, haloperidol, mibefradil, propafenone, quinidine, ritonavir, and thioridazine. For example, ritonavir increases the AUC of tramadol native of 1.5 to 3 times compared with monotherapy. In other cases, the interaction has no clinical significance as in the case of cimetidine increases the plasma half-lives of tramadol and M1 and increases the urinary excretion of tramadol native reducing the M1. Similarly, tricyclic antidepressants and other drugs related (cyclobenzaprine or phenothiazines) inhibit tramadol metabolism native but also lower the seizure threshold, increasing the risk of seizures
Tramadol should not be used in patients under treatment with monoamine oxidase inhibitors (MAOIs). These include furazolidone, linezolid and procarbazine. The international recommendations contraindicate the concurrent use of tramadol and MAOIs and even recommend discontinue MAOIs at least two weeks before starting treatment with tramadol.
The combination of drugs that inhibit the reuptake of serotonin and cheap tramadol has been associated with serotonin syndrome and increased risk of seizures. Have described several cases of serotonin syndrome when administered at the same time tramadol sertraline or paroxetine. These effects are due to selective inhibitors of serotonin reuptake inhibit the formation of M1 to inhibit CYP2D6 enzyme system. Besides reducing the analgesic efficacy of tramadol plasma concentrations native (which is more serotonin to its metabolite) increase considerably.
Although no clinical data, other medications which increase serotonin levels (by preventing their uptake or other mechanisms) may cause these effects in patients treated with generic tramadol
Tramadol may cause effects central nervous system depressants may be additive with other drugs that depress the central nervous system, debiendose take extreme precautions. It recommends reducing the dose of tramadol in patients treated with barbiturates, phenothiazines, benzodiazepines or other tranquilizers, sedatives or hypnotics.
While the respiratory depression is rare in the case of tramadol hydrochloride, its incidence increases significantly when the drug is used concomitantly with other medications that also produce respiratory depression as is the case of general anesthetics and alcohol.
Has reported an increase in the toxicity of digoxin as the drug and tramadol were used simultaneously.
Similarly it has been reported an increase in INR in patients previously stabilized on warfarin therapy initiated with tramadol. The mechanism of this interaction and that tramadol is not highly bound to plasma proteins or interfere with the enzymes that metabolize warfarin. In any case, it is recommended that patients with anticoagulated patients treated with tramadol.
Herbs that reduce the reuptake of serotonin and St. John's wort (Hypericum perforatum) can add their effects to cheap tramadol effects of serotonin may result in serotonin syndrome.
ADVERSE REACTIONS
The incidence and severity of adverse reactions order tramadol depend on the dose, route of administration and duration of treatment. The incidence of adverse reactions is increased when tramadol is used in doses of 200 mg a day compared with doses of 50 mg or 100 mg / day.
The most common adverse reactions are dizziness and vertigo (between 26 and 36%), nausea / vomiting (between 24 and 40%), constipation (24 to 46%), headache (18 to 32%) lethargy (16 to 25%), pruritus (8 to 11%), asthenia (6 to 12%), diaphoresis (6 to 9%), dyspepsia (5 to 13%), xerostomia (5 to 10%) and diarrhea (5 to 10%). Nausea, vomiting and sweating are more common during the intravenous injection is very quick, recommended that the injection is practiced in 1-2 minutes. To reduce the incidence of nausea and vomiting suggest a gradual increase in dose (eg 50 mg increments every 3 days). It may also be beneficial administration of an antiemetic during the first days of treatment.
Tramadol online causes less constipation than equipotent doses of paracetamol and codeine, without affecting significantly the sphincter of Oddi.
The central nervous system stimulation is manifested by nervousness, anxiety, agitation, tremors, spasticity, euphoria and hallucinations have been observed up to 7% of patients treated with tramadol for 7 days and in 14% of those treated for 90 days. Other CNS effects, affecting between 1 and 5% of patients include confusion, impaired coordination, sleepiness, insomnia and visual disturbances. In less than 1% in drug causes amnesia.
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In a study of post-marketing surveillance in 10,916 patients, the normal therapeutic doses showed no increased risk of idiopathic seizures. However, these can occur in patients with a history of convulsive disorders and treated with drugs that reduce the seizure threshold has a greater presdisposicion for the development of seizures induced by tramadol. In cases of overdose, neurotoxicity is due to an effect of excess serotonin to a opiate effect.
At recommended doses, tramadol has no significant respiratory depressant effects, which were lower than those of other opioid agonists. However in case of overdose or when combined with other drugs such as alcohol and general anesthetics may occur significant respiratory depression. The lowest dose of tramadol associated with respiratory depression reported so far is the 800 mg.
Have been reported rarely severe anaphylactic reactions, these being more likely in patients with allergy to codeine. Other allergic manifestations are urticaria, nonspecific rash, Stevens-Johnson syndrome and toxic epidermal necrolysis.
Physical dependence have been reported reactions, tolerance and withdrawal syndrome during treatment with tramadol 50mg. Occasionally has been associated with psychological dependence and symptoms characteristic of withdrawal syndrome have been observed in patients who were given naloxone. In patients with a history of drug addiction, tramadol can restart a physical dependence and the same can occur in patients prone to drug abuse. Not recommended for use in these patients tramadol
Urogenital effects have been reported in 1-5% of patients, characterized by urinary frequency, urinary retention and menopausal syndromes such as hot flashes.
The incidence of cardiovascular effects is the most frequent low vasodilation (1-5%) with hypotension, orthostatic hypotension and sinus tachycardia (<1%)
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