The initial dose is 50mg two to three times daily. After two to three weeks that may be increased to 100mg two to three times daily. Presuming this stuff works, the maintenance dose of 200–300mg may then be taken all at once at bedtime, but anything above 300mg a day needs to be split into two, or even three doses a day.
Inpatients may receive up to 600mg a day.
Given the incidence of AP-related side effects, you and your doctor should seriously discuss any increase above 200mg a day. You’d probably know by then if it’s going to be doing something positive for you.
Return to Table of Contents
How to Stop Taking Asendin (discontinuation / withdrawal)
Tri/tetracyclics don’t have much of a discontinuation syndrome. Depending on why you need to stop taking it, reducing your dosage by 50–100mg a day each week should be relatively painless.
Return to Table of Contents
Asendin’s Pros and Cons
Amoxapine has been around since forever, so doctors are familiar with its uses and effects. Like most tetracyclics It starts to work very quickly. As it’s practically a combination antidepressant & antipsychotic it could be just the thing for anyone with treatment-resistant depression as well as psychotic, agitated and/or delusional depressions. And since it’s available only as a generic amoxapine is probably the cheapest antidepressant & antipsychotic on the market.
Return to Table of Contents
Amoxapine has been since forever, so younger doctors are less likely to prescribe it and other tri/tetracyclics, even if they might be a better first or second choice for you. The chances for movement- and prolactin-related side effects are less than Risperdal’s Risperdal’s but greater than a lot of other AAPs. It’s not really an antidepressant & antipsychotic cocktail so you can’t easily mix and match a replacement. Who knows how much longer it will be available in the US as it’s been pulled from the UK and New Zealand since I wrote the original article in 2004.
Return to Table of Contents
Stick to your AD-based treatment plan with buttons and magnets. 2.25″ $4 & 3.5″ $4.50
No matter which neurological and/or psychiatric drug you take, you’ll probably get one or more of these side effects. These will usually be gone, or at least will diminish to the point where you barely notice it most of the time, within a week or two.
Drowsiness / fatigue - even when taking stimulants in some circumstances.
Insomnia, instead of or alternating with the drowsiness.
Assorted other minor GI complaints (constipation, diarrhea, etc.)
Generally feeling spacey / out of it
Which can all add up to the ever-helpful “flu-like symptoms” listed as an adverse event on the PI sheet of practically every medication on the planet used to treat almost any condition humans and other animals could have.1
All crazy meds can, and probably will affect your dreams as well. There is no way of telling if that will be good or bad, let alone if this side effect is permanent or temporary.
Any of the above side effects you see listed again below means they’re even more likely to happen and/or stick around longer and/or are worse than most other meds.
Typical Potential Side Effects
The anticholinergic and norepinephrine-reuptake inhibition side effects typical when starting TCAs - headache, nausea, sweating, dry mouth, sleepiness or insomnia, constipation, urinary hesitancy, and blurry vision. As amoxapine isn’t much of an anticholinergic and only a moderate antihistamine expect most of them to pass in a week or two. The constipation and urinary hesitancy are the most likely to stick around.
Return to Table of Contents
Uncommon Potential Side Effects
Since amoxapine turns out to be a hybrid antipsychotic and antidepressant, you can get all the side effects related to antipsychotics that aren’t any good as anticholinergics, like Risperdal and Saphris: movement disorders (EPS, TD, and akathisia) and big tits that leak milk. The last two are especially fun if you’re a guy.
Return to Table of Contents
Asendin’s Half-Life & How Long Until It Clears Your System
Plasma half-life: Amoxapine does a double metabolism. The drug itself has a half-life of around 8 hours. Its major metabolite has a half-life of 30 hours. Expect it to clear out of your system in 7–8 days.
Half-life is the average time it takes for you to process half of the drug’s active ingredient. If a drug has a half-life of around 24 hours and you take a dose of 100mg, you’ll have roughly the equivalent a 50mg dose after one day, a 25mg dose after two days, and so on. The rule of thumb is: multiply the half-life by five and you get how long it is for the dose you took to be cleared from your bloodstream2, so there’s nothing swimming around to attach itself to your brain and start doing stuff. That’s called “plasma clearance.” Complete clearance is a complex equation based on a lot of factors which may or may not: be published in the PI sheet, include personal data like your weight, or even completely figured out by corporate and independent researchers. It usually winds up being 2–5 days after plasma clearance no matter what3, but can take weeks. Sometimes a drug will clear from your brain and other organs before it clears from your blood.
Steady state is reached in: None is published that I could find. Based on the half-lives I’m presuming 7–8 days, if everything is nice and linear.
Steady state is the flipside of half-life. This is when you can expect to get over side effects caused by fluctuating amounts of a medication in your bloodstream. Often, but not always the same amount of time as the plasma clearance above.
The active ingredient is usually the same as the generic name, but more often than not it’s a chemical salt of the substance identified as the generic. E.g. Fluoxetine is the generic for Prozac, but the active ingredient is fluoxetine hydrochloride (or HCl). It usually doesn’t make much of a difference outside of the more esoteric aspects of a drug’s pharmacology, but not always.
It’s always a good idea to check for drug-drug interactions yourself. Just because most people in the crazy meds business know about really important interactions (e.g. MAOIs and a lot of stuff, warfarin and everything on the planet) doesn’t mean the person who prescribed your meds told you about them, or the pharmacist has all the meds you take at their fingertips like they’re supposed to. Or they have the time to do their jobs properly when not dealing with complete idiots or playing Angry Farmers on teh Faecesbooks.
Learn more about drug-everything interactions on our page of tips about taking crazy meds.
Name, Address, Serial Number (Generic and Overseas Availability)
Not including controlled/extended/sustained release suffixes (Efexor ER, Trevilor retard e.g.) or branded generics that are a hyphenate of the generic name and the drug company name (Apo-Citalopram e.g.).
Given how strong amoxapine is at D2 I’m not surprised at the rate of side effects like leaking tits and tardive dyskinesia (TD). 300mg a day is sort of like taking 10mg a day of Risperdal as far as D2dopamine is concerned, (not taking pharmacokinetics into account, keep reading) and just thinking of 10mg a day of Risperdal is almost enough for my TD symptoms to reappear.
On the plus side, amoxapine is probably misclassified as an antidepressant. Some people want it to be classified as an atypical antipsychotic. There’s more than enough evidence for it. Top studies:
Amoxapine vs. Risperdal for schizophrenia. Equally effective. Bonus: the people taking amoxapine (average dosage ~225mg) had lower prolactin levels than those taking Risperdal (average dosage 4.5mg). Lower prolactin means that, although the leaking tits and TD can still happen and suck bad enough to make you stop taking it, it’s still less likely to happen and won’t be as bad with an equivalent dosage of Risperdal.
After looking at all the evidence, I agree with them Asendin (amoxapine) is more antipsychotic than antidepressant. It’s just never going to be approved to treat schizophrenia, because no one wants to spend the money getting a new approval for a generic, so I don’t know if and when I’ll move it. For now I’ll list it in both categories.
Rating 1.7 out of from 6 criticisms.
Vote Distribution: 3 – 0 – 1 – 0 – 2 – 0
Rate this article
If you’re still feeling judgmental as well as just mental4, please boost or destroy my self-confidence by honestly (and anonymously) rating this article on a scale of 0 to 5. The more value-judgments the better, even if you can criticize my work only once.
Get all judgmental about the Asendin (amoxapine) Synopsis
Rates 4.0 out of 5 from 2 value judgments.
Vote Distribution: 0 – 0 – 0 – 0 – 2 – 0
1 As well as being an indication of half of said conditions.
2 Based on Julien's calculations from A Primer of Drug Action, the half-life multiplied by five is the generally accepted estimate of how long it takes a single dose of any given drug to be eliminated from the blood stream/plasma of someone with a normal metabolism. That's also the rough estimate for steady state if they can't get, or won't provide a number for that.
3 For crazy meds. I have no idea what the average complete clearance is for other types of medications. For all I know there are drugs that utterly vanish from your system in under five passes, and others that won't let go of your squishy bits for years after you stop taking them.
4 Thank you! I'll be here all weak. Be sure to tip your content provider. And don't try the veal, it's cruelicious!
If you have any questions not answered here, please see the Crazymeds Asendin discussion board. We welcome criticisms of the articles, notifications of bad links, site problems, consumer experiences with medications, etc. I’m not always able to write back. Hence I never answer questions about meds via e-mail that are answered by this or other articles. Especially if they have been repeatedly asked on the forum. That’s why we write these damn things. Questions about which meds are best for your condition should also be asked on the forum; because this is a free site, so the price of admission is making things easier for somebody else searching for the same answer. We don’t deal with children on the forum or in private because after doing this for ten years I don’t have the emotional stamina to deal with kids who have brain cooties. How to contact Crazymeds. — Jerod Poore, CME, Publisher Crazymeds (crazymeds.us)
Last modified on Saturday, 22 March, 2014 at 12:31:51 by SomeMedCritic
Asendin, and all other drug names on this page and used throughout the site, are a trademark of someone else. Asendin’s PI Sheet will probably have the name of the manufacturer and trademark owner (they’re not always the same company) at or near the very bottom. Or ask Google who the owner is. The way pharmaceutical companies buy each other and swap products like Monopoly™ real estate, the ownership of the trademark may have changed without my noticing. It may of changed hands by the time you finished reading this article.
All rights reserved. No warranty is expressed or implied in this information. Consult one or more doctors and/or pharmacists before taking, or changing how you take any neurological and/or psychiatric medication. Your mileage may vary. What happened to us won’t necessarily happen to you. If you still have questions about a medication or condition that were not answered on any of the pages you read, please ask them on Crazy Talk: the Crazymeds Forum.
The information on Crazymeds pertains to and is intended for adults. While some information about children and adolescents is occasionally presented (e.g. US FDA approvals), pediatric-specific data such as dosages, side effects, off-label applications, etc. are rarely included in the articles on drugs or discussed on the forum. If you are looking for information regarding meds for children you’ll have to go somewhere else. Plus we are big pottymouths and talk about S-E-X a lot. Know your sources! Nobody on this site is a doctor, a therapist, or a pharmacist. We don’t portray them either here or on TV. Only doctors can diagnose and treat an illness. While it’s not as bad as it used to be, some doctors still get pissed off by patients who know too much about medications, so tread lightly when and where appropriate. Diagnosing yourself from a website is like defending yourself in court, you suddenly have a fool for a doctor. Don’t be a cyberchondriac, thinking you have every disease you see a website about, or that you’ll get every side effect from every medication1. Self-prescribing is as dangerous as buying meds from fraudulent online pharmacies that promise you medications without prescriptions.
All information on this site has been obtained from the medications’ product information / summary of product characteristic (PI/SPC) sheets and/or medication guides - which is all you get from sites like WebMD, RxList, NAMBLA NAMI, etc., the sources that are referenced throughout the site, our personal experience and the experiences family, friends, and what people have reported on various reputable sites all over teh intergoogles. As such the information presented here is not intended as a substitute for real medical advice from your real doctor, just a compliment to it. You should never, ever, replace what a real doctor tells you with something from a website on the Internet. The farthest you should ever take it is getting a second opinion from another real doctor. Educate yourself - always read the PI/SPC sheet or medication guide/patient information leaflet (PIL) that comes with your medications and never ever throw them away. OK, you can throw away duplicate copies, but keep at least one, as that’s your proof of purchase of having taken a med in case a doctor doubts your medical history. Plus they take up less space than a bottle, although keeping one inside of a pill bottle is even better.
Crazymeds is not responsible for the content of sites we provide links to. We like them, or they’re paid advertisements, or they’re something else we think you should read to help you make an informed decision about a particular med. Sometimes they’re more than one of those things. But what’s on those sites is their business, not ours.
Crazymeds is optimized for ridiculously large screens and browsers that don’t block ads. I use Firefox and Chrome, running under Windows 72. On a computer that sits on top of my desk. With a 23 inch monitor. Hey, at least you can make the text larger or smaller by clicking on the + or - buttons in the upper right hand corner. If you have Java enabled. Like 99% of the websites on the planet, Crazymeds is hosted on domain running an open source operating system with a variety of open source applications, including the software used to display what you’ve been reading. As such Crazymeds is not responsible for whatever weird shit your browser does or does not do when you read this site3.
No neurologists, psychiatrists, therapists or pharmacists were harmed in the production of this website. Use only as directed. Void where prohibited. Contains nuts. Certain restrictions may apply. All data are subject to availability. Not available on all mobile devices, in the 12 Galaxies Guiltied to a Zegnatronic Rocket Society, or in all dimensions of reality. Hail Xenu!
‘Everything is true, nothing is permitted.’ - Jerod Poore
1 While there are plenty of books to help you with hypochondria, for some reason there’s not much in the way of websites. Then again, staying off of the Internetis a large part of curing/managing the disorder.
2 Remember kids, Microsloth operating systems are like TOS Star Trek movies with in that every other one sucks way, way more. With TOS Star Trek movies you don’t want to bother watching the odd-numbered ones. With Microsloth OS you don’t want to buy and install the even-numbered ones. Anyone who remembers ME and Vista knows what I mean.
3 Have I mentioned how open source operating systems for commercial applications is one of the dumbest ideas in the history of dumb ideas?* I don’t even need my big-ass rant any more. Heartbleed has made my case for me. And that’s just the one that got all the media attention. The very nature of an open source operating system makes security as much of an illusion of anonymity. Before you flip out too much: the domain Crazymeds is hosted on uses a version of SSL that is not affected by the Heartbleed bug. That’s one of the many reasons why I pay a lot of money and keep this site on Lunarpages.
* Yes, I know I’m using open source browsers. I also test the site using the now-defunct IE and Safari browsers. Their popularity - and superiority - killed IE and Safari, so that’s why I rely on the open source browsers. It’s like brand vs. generic meds. Sometimes the generic is better than the brand.