Tramadol (INN) (pronounced /ˈtræmədɒl/ ) ( Tramal , Ultram , Ultram ER , Mabron , Ralivia , Ryzolt , Tradonal , Tramacet , Tridural , Medtrap injs 1ml/2ml and tabs , Ultracet , Zamadol , Zydol , Zytram ) is a centrally acting analgesic, used for treating moderate to severe pain.
Tramadol was developed by the German pharmaceutical company Grünenthal GmbH in the late 1970s.
Tramadol possesses agonist actions at the μ-opioid receptor and affects reuptake at the noradrenergic and serotonergic systems. Tramadol is a compound with mild and delayed μ-agonist activity.
Tramadol is a synthetic stripped-down analog of Codeine and, as such, is an opioid. Opioids are chemical compounds which agonise one or more of the human opiate receptors, regardless of the receptor class or sub-type. The opioid agonistic effect of tramadol and its major metabolite(s) almost exclusively affects the μ-opioid receptor. This characteristic is notable, because even morphine is not exclusive to the μ-receptor, although it manifests the preponderance of its opioid agonistic effects here.
Uses
Tramadol is used to treat moderate to moderately severe pain and most types of neuralgia, including trigeminal neuralgia. Tramadol is like levorphanol (albeit with much lower mu-agonism), somewhat, pharmacologically, as both opioids are also NMDA-antagonists which also have SNRI activity. It has been suggested (and proven in many people) that tramadol could be effective for alleviating symptoms of depression, anxiety, and phobias because of its action on the noradrenergic and serotonergic systems. However, health professionals have not endorsed its use for these disorders; although may/-can be used at a few scale of its orders and at unique treatment (just-only when other treatments failed-missed), and have to be used under-/with control of a psychiatrist.
In May 2009, the United States Food and Drug Administration wrote a warning letter to Johnson & Johnson, warning that a promotional website by the manufacturer had "overstated the efficacy" of the drug, and "minimized the serious risks".
Availability
Tramadol is usually marketed as the hydrochloride salt ( tramadol hydrochloride ); the tartrate is seen on rare occasions, and rarely (in the US at least) Tramadol is available for both injection (intravenous and/or intramuscular) and oral administration. It is also available in conjunction with acetaminophen (paracetamol, APAP) as Ultracet, a non-generic form of a smaller dose of 37.5 mg Tramadol and 325 mg of APAP. The solutions suitable for injection are used in Patient-Controlled Analgesia pumps under some circumstances, either as the sole agent or along with another agent such as morphine.
Tramadol comes in many forms, including:
- capsules (regular and extended release)
- tablets (regular, extended release, chewable, low-residue and/or uncoated tablets that can be taken by the sublingual and buccal routes)
- suppositories
- effervescent tablets and powders
- ampoules of sterile solution for SC, IM, and IV injection
- preservative-free solutions for injection by the various spinal routes (epidural, intrathecal, caudal, and others)
- powders for compounding
- liquids both with and without alcohol for oral and sub-lingual administration, available in regular phials and bottles, dropper bottles, bottles with a pump similar to those used with liquid soap and phials with droppers built into the cap
- tablets and capsules containing (acetaminophen/APAP), aspirin and other agents.
Tramadol has been experimentally used in the form of an ingredient in multi-agent topical gels, creams, and solutions for nerve pain, rectal foam, concentrated retention enema, and a skin plaster (transdermal patch) quite similar to those used with lidocaine.
Tramadol has a characteristic taste which is mildly bitter but much less so than morphine and codeine. Oral and sublingual drops and liquid preparations come with and without added flavoring. Its relative effectiveness via transmucosal routes (sublingual, buccal, rectal) is around that of codeine, and, like codeine, it is also metabolized in the liver to stronger metabolites (see below).
The maximum dosage for tramadol in any form is 400 mg/day. Certain manufacturers or formulations have lower maximum doses. For example, Ultracet (37.5 mg/325 mg tramadol/APAP tablets) is capped at 8 per day (300 mg/day). Other popular formulations such as Ultram ER are available in 100, 200, and 300 mg/day doses. Patients with impaired liver function or using SSRIs should consult with their doctor regarding adjusted dosing.
Off-label and investigational uses
- diabetic neuropathy
- postherpetic neuralgia
- fibromyalgia
- restless legs syndrome
- opiate withdrawal management /Anti-Depressant withdrawal aid (proven to be effective, especially with withdrawal from its distant relative Venlafaxine(Effexor).
- migraine headache
- obsessive-compulsive disorder
- premature ejaculation
Veterinary
Tramadol is used to treat post-operative, injury-related, and chronic (e.g., cancer-related) pain in dogs and cats as well as rabbits, coatis, many small mammals including rats and flying squirrels, guinea pigs, ferrets, and raccoons. Tramadol comes in ampoules in addition to the tablets, capsules, powder for reconstitution, and oral syrups and liquids; the fact that its characteristic taste is not very bitter and can be masked in food and diluted in water makes for a number of means of administration. No data that would lead to a definitive determination of the efficacy and safety of tramadol in reptiles or amphibians is available at this time, and, following the pattern of all other drugs, it appears that tramadol can be used to relieve pain in marsupials such as North American opossums, Short-Tailed Opossums, sugar gliders, wallabies, and kangaroos among others.
Tramadol for animals is one of the most reliable and useful active principles available to veterinarians for treating animals in pain. It has a dual mode of action: mu agonism and mono-amine reuptake inhibition, which produces mild anti-anxiety results. Tramadol may be utilized for relieving pain in cats and dogs. This is an advantage because the use of some non-steroidal anti-inflammatory substances in these animals may be dangerous.
When animals are administered tramadol, adverse reactions can occur. The most common are constipation, upset stomach, decreased heart rate. In case of overdose, mental alteration, pinpoint pupils and seizures may appear. In such case, veterinarians should evaluate the correct treatment for these events. Some contraindications have been noted in treated animals taking certain other drugs. Tramadol should not be co-administered with Deprenyl or any other psychoactive ingredient such as serotonin reuptake inhibitors, tricyclic antidepressants, or mono-amine oxidase inhibitors. In animals, tramadol is removed from the body via liver and kidney excretion. Animals suffering from diseases in these systems should be monitored by a veterinarian, as it may be necessary to adjust the dose.
Dosage and administration of tramadol for animals: in dogs a starting dosage of 1–2 mg/kg twice a day will be useful for pain management. Cats are administered 0.5-1 mg/kg twice a day.
Pregnancy and breastfeeding
Tramadol is in FDA pregnancy category C; animal studies have shown its use to be dangerous during pregnancy and human studies are lacking. Therefore, the drug should not be taken by women that are pregnant unless "the potential benefits outweigh the risks".
Tramadol causes serious or fatal side-effects in a newborn including neonatal withdrawal syndrome, if the mother uses the medication during pregnancy or labor. Use of tramadol by nursing mothers is not recommended by the manufacturer because the drug passes into breast milk. However, the absolute dose excreted in milk is quite low, and tramadol is generally considered to be acceptable for use in breastfeeding mothers.
Adverse effects and drug interactions
The most commonly reported adverse drug reactions are nausea, vomiting, sweating and constipation. Drowsiness is reported, although it is less of an issue than for non-synthetic opioids. Patients prescribed tramadol for general pain relief along with other agents have reported uncontrollable withdrawal-like nervous tremors if weaning off the medication happens too quickly. Respiratory depression, a common side-effect of most opioids, is not clinically significant in normal doses. By itself, it can decrease the seizure threshold. When combined with SSRIs, tricyclic antidepressants, or in patients with epilepsy, the seizure threshold is further decreased. Seizures have been reported in humans receiving excessive single oral doses (700 mg) or large intravenous doses (300 mg). An Australian study found that of 97 confirmed new-onset seizures, eight were associated with Tramadol, and that in the authors' First Seizure Clinic, "Tramadol is the most frequently
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