Tapentadol is a drug for pain. It was approved by the US FDA for the treatment of moderate to severe pain. The FDA news release was dated 24 November 2008, although the actual approval was a few days earlier.
Tapentadol acts on μ-opioid receptors, making it similar to morphine and its ilk, tramadol hcl 375mg. Do we need another opioid agonist? And if so, why? Suspicions deepen because it was produced by the same company that makes tramadol. Indeed, it is similar to tramadol in many ways, tramadol hcl 375mg. Tramadol is the active ingredient in Ultram®, now available as a generic. This is sounding like a familiar me-too drug story.
On the other hand, chronic pain is a common problem:
Chronic pain prevalence estimates were 10.1% for back pain, 7.1% for pain in the legs/feet, 4.1% for pain in the arms/hands, and 3.5% for headache. Chronic regional and widespread pain were reported by 11.0% and 3.6% of respondents, , respectively.
Existing treatments often are not satisfactory. With opioid medications, there is risk of psychological dependence and various kinds of diversion and misuse. People put it in their noses and veins and things like that. Perhaps more importantly, though, is the fact that some people develop adverse effects at the doses required to achieve adequate pain control.
So what makes tapentadol different?
Much of the information presented here comes from this article:
(-)-(1R,2R)-3-(3-Dimethylamino-1-ethyl-2-methyl-propyl)-phenol Hydrochloride (Tapentadol HCl): a Novel µ-Opioid Receptor Agonist/Norepinephrine Reuptake Inhibitor with Broad-Spectrum Analgesic Properties
First, let's look at tramadol. Tramadol is an agonist for μ-opioid receptors, tramadol hcl 375mg, but it also inhibits reuptake of serotonin and norepinephrine (monoamines). It appears that the effect on monoamines is something that is important for the analgesic effect of tramadol. After all, , tramadol is a rather weak agonist of opioid receptors.
Tramadol, however, has several problems. The weakness of its effect on opioid receptors means that it would not be expected to have a robust effect on acute pain. The fact that tramadol depends upon the monoamine effect for its action, means that it often works better for chronic pain, tramadol hcl 375mg. (Note that the use of weasel words, e.g. "expected," "often" is intentional; ; it reflects the fact that different people respond differently.)
Furthermore, tramadol hcl 375mg, tramadol by itself is not very effective unless some of it is metabolized to O-desmethyl-tramadol. This requires an enzyme, cytochrome P450 2D6 (CYP2D6). Persons who are relatively deficient in CYP2D6 activity, or who are also taking a drug that blocks CYP2D6, may not get the full effect.
Lastly, tramadol is a racemic mixture; that is, it comes in left- and right-handed versions. The actions of the two versions are different, tramadol hcl 375mg, and the actions of the two versions of the metabolite are different. This is not necessarily a problem, but it is a complicating factor.
With the understand on tramadol, we now can take a look at tapentadol to see if it offers any meaningful advantage.
The key differences are: tapentadol has a stronger effect on the reuptake of norepinephrine than serotonin, , it does not depend on CYP2D6 activity, and it is not a racemic mixture, mixing hydrocodone energy drink. All of these factors are advantageous, tramadol hcl 375mg, at least theoretically. Based upon these findings, tramadol hcl 375mg, one would expect that tapentadol would be less prone to cause adverse effects, and that it would be much less likely to be involved in drug interactions, tramadol hcl 375mg. Premarketing data are encouraging, though.
Additionally, tapentadol is more potent than tramadol at the μ-opioid receptor, but less potent than morphine. Note, however, that higher potency does not necessarily translate into higher clinical utility.
I tend to think that the advantages are great enough to justify the development of tapentadol for the market. There are so caveats, tramadol hcl 375mg, however. It is not possible to make any firm assessment of a risks of a drug, prior to its release into the wider market. That is, the basic pharmacology suggests that most patients will be less likely to have adverse effects, , but this remains to be seen, tramadol hcl 375mg.
Also, as is the case with any opioid agonist, the potential for diversion and abuse cannot be assessed fully. There are examples of drugs that were thought to present a minimal risk of abuse, tramadol hcl 375mg, prior to being released into the wild, , but for which that turned out not to be the case. Talwin, Stadol, tramadol hcl 375mg, and of course Oxycontin, , come to mind in this respect. Iwould be very cautious about making any assumptions about the potential for diversion and abuse with tapentadol. In fact, the DEA has yet to assign the drug into one of its schedules.
As for what I think of tapentadol, , I suspect that it will turn out to be useful, but not a blockbuster. If the safety profile is significantly better than that for tramadol, it may be possible to use it at higher doses, which might translate into greater clinical utility.
I do have two big questions, , though, tramadol hcl 375mg. One: is this drug really any better than a combination of a medium-strength opioid, say hydrocodone, along with a norepinephrine reuptake inhibitor, say nortriptyline? Both are pretty inexpensive, , so for the tapentadol to have a rational place in our pharmacopoeia, it would have to have some benefit that cannot be gotten for less money. (Not that markets are always rational, but still...)
Two: what it is potential for lowering the seizure threshold? Tramadol does this. It usually is not an issue unless a person takes a great deal more than what was prescribed, , or it there is a drug interaction. The drug interaction should not be a problem with tapentadol, but we can assume that many persons will take doses that are larger than prescribed, tramadol hcl 375mg. Tapentadol presumably will come with a warning about that, but that won't stop many people. Note that I do not consider this a reason to keep the drug off the market, , but I do think that clinicians should keep the possibility in mind.
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Disclosure: tramadol hcl 375mg, I don't own any pharmaceutical stocks (not directly, anyway; I probably have some small bit in a mutual fund somewhere), nor do I work for any company that has anything to do with any of the products mentioned.
For many patients who suffer from varying effects of pain, , over the counter medicines are often far too impotent a measure. In addition, , health insurance is either overpriced or unobtainable due to a pre-existing condition. Your pain, however, does not bother to sit on the sidelines and wait for you to procure proper medication. It navigates through your body, burning your nerve endings, turning the joints into cyclones of inflammation, your entire body a four star hotel of hurt. So when pain checks in, it is crucial to have medication that not only has the strength to counteract it, but can be accessed and refilled without a prescription, tramadol hcl 375mg. Thankfully, many online pharmacies carry drugs like tramadol no prescritption required. Tramadol, commonly known as Ultram or Tramal, is an analgesic that acts quickly and centrally while treating moderate to severe pain, tramadol hcl 375mg. It has a wide array of uses, such as treatment for acid reflux, fibromyalgia, and restless leg syndrome, tramadol hcl 375mg. Developed in the 1970s, , the drug has been on the market for many years and has been widely hailed by doctors and medical professionals alike for its ability to root out and soothe pain, tramadol hcl 375mg. Take a tablet of tramadol no prescritption necessary, and you could be well on your way to being pain free. Biologically, Tramadol no prescritption is a synthetic opioid similar to codeine. Opioids are chemicals that act upon the opiate receptors in the human body. When imbibed, , patients typically feel both a sense of euphoria and respiratory relaxation. Tramadol also releases serotonin and inhibits norepinephrine. Like codeine, Tramadol in addition to pain can also treat most types of neuralgia. It has been suggested by some clinical psychologists that the drug can also be effective against symptoms of anxiety, tramadol hcl 375mg, depression, or deep rooted phobias. Tramadol can also be used to wean patients of higher grade opiate drugs such as morphine. Tramadol can be administered via an injection, either intravenously or intramuscularly, or orally. Generally, a dose of 50 mg are made by several manufactures, both in brand name and generic form. Solutions suitable for an injection are typically placed in an analgesia pump with which the patient controls the dosage. Experimentally, the tramadol no prescritption drug has been used in topical gels and creams as a solution for high intensity nerve pain. It has also been administered as a rectal foam, tramadol hcl 375mg, an enema, and a skin graft similar to those used with other painkilling drugs. They can also come in the form of liquid drops which can be placed on the tongue. Tramadol has a uniquely unpleasant taste which has been reported to be mildly acrid. However, the droplets can be mixed with other solutions to make the taste more pleasing. The maximum dosage for oral tramadol no prescritption is 400 mg to 600 mg per day. The reason for the range depends largely on the manufacturer, as each have separate formulations with varying maximum dosages. Patients taking tramadol no prescritption should consult their doctor if they are uncertain as to the dosage that works best for them. It is also highly unrecommended that a patient combine the drug with other opiates such as morphine, tramadol hcl 375mg, codeine, or lidocaine. Tramadol should not be used by pregnant females or nursing mothers. Generally, a normal tablet can be taken with or without food, , once every four to six hours, or as dictated by the pain. Some forms of the tablet are equipped with a time release, tramadol hcl 375mg, and can be administered once a day. Patients using the extended release version should use tramadol no prescritption at the same time each day, and avoid taking more than the recommended dosage. If you have started on a lower dosage, the total can be gradually increased, , however, once every three days for regular tablets and once every five days for time release tablets. Tablets should be swallowed whole; do not chew, crush, or split them. While hospitals administer the drug in a variety of different ways, generally tablets should not be ground into a powder and snorted, or dissolved into a solution for injection, tramadol hcl 375mg, but rather taken orally as intended by the manufacturer, mixing hydrocodone energy drink. Failure to abide by the instructions listed with the tablets could result in little to no effect on your pain level. Tramadol is an excellent drug to treat a variety of different pains. Whether the cause is post-operative pain, serious injury, chronic pain or stress, the pain-numbing aspects of tramadol no prescritption provide the relief you require in a single pill. It is not just a pain remover, it is a painkiller, a drug that attacks the causes of pain with reckless abandon. Tramadol is a drug that shows no mercy, sending you into the pure confines of pain-murdering bliss. Tramadol can also be used as a therapeutic drug, tramadol hcl 375mg, alleviating the many psychological discomforts that are often unseen and untreated, yet can make living unbearable, tramadol hcl 375mg. However, due to its efficacy, many pharmacies insist on a prescription before allowing you to take the drug, 10 tramadol ultram for my dog. They want patients to fill out an interminable stack of forms, to hand sign and mail each one and wait weeks as it sits idly on a bureaucrat's desk. They want you to suffer through your pain as the bureaucrat takes a long lunch, his mind ignorant of the plight of the nerves in your body conspiring against you. This is where online pharmacies can help, able to circumvent the bureaucracy and quickly supply you with the medication you need. With tramadol no prescritption, tramadol hcl 375mg, you will no longer be a slave to pain. You will own it. You will be free.
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