HALTING SSRIs
DAVID HEALY MD FRCPsych
N WALES DEPT of PSYCHOLOGICAL MEDICINE
SSRIs
SSRI stands for selective serotonin reuptake inhibitor. This does not mean
these drugs are selective to the serotonin system or that they are in some
sense pharmacologically clean. It means they have little effects on the
norepinephrine/noradrenaline system. There are 8 Serotonin reuptake
inhibitors on the market:
UK Trade Name US Trade Name
Fluoxetine Prozac Prozac
Paroxetine Seroxat Paxil
Sertraline Lustral Zoloft
Citalopram Cipramil Celexa
Escitalopram Cipralex Lexapro
Fluvoxamine Faverin Luvox
Venlafaxine Effexor Efexor
Duloxetine Cymbalta Cymbalta
Venlafaxine in doses up to 150mg is an SSRI. Over 150 mg it also inhibits
noradrenaline reuptake. Duloxetine is a potent serotonin reuptake inhibitor but
not selective to the serotonin system.
WITHDRAWAL SYMPTOMS
SSRI withdrawal symptoms break down into two groups.
The first group may be unlike anything you have had before:
Dizziness when I turn to look at something I feel my head lags behind.
Electric Head - which includes a number of strange brain sensations
its almost like the brain is having a version of goose pimples
Electric Shock-like Sensations Zaps like being prodded with a cattle prod
Other Strange Tingling or Painful Sensations
Nausea, Diarrhoea, Flatulence
Headache
Muscle Spasms/ Tremor
Dreams, including Agitated Dreams or other Vivid Dreams
Agitation
Hallucinations or other visual or auditory disturbances
Sensitivity to noises or visual stimuli
The second group are symptoms which may lead you or your physician
to think that all you have are features of your original problem. These include:
Depression and Anxiety these are the commonest 2 withdrawal symptoms
Labile Mood emotions swinging wildly
Irritability
Confusion
Fatigue/ Malaise Flu-like Feelings
Insomnia or Drowsiness
Sweating
Feelings of Unreality
Feelings of being Hot or Cold
Change of Personality
More generally there is an intolerance of stress.
Any difficulties present may wax and wane and this can be demoralising.
IS THIS WITHDRAWAL?
There are three ways to distinguish SSRI withdrawal from the nervous
problems that the SSRI might have been used to treat in the first instance.
First if the problem begins immediately on reducing or halting a dose or
begins within hours or days or perhaps even weeks of so doing then it is more
likely to be a withdrawal problem. If the original problem has been treated and
you are doing well, then on discontinuing treatment no new problems should
show up for several months or indeed several years.
Second if the nervousness or other odd feelings that appear on reducing or
halting the SSRI (sometimes after just missing a single dose) clear up when
you are put back on the SSRI or the dose is put back up, then this also points
towards a withdrawal problem rather than a return of the original illness.
When original illnesses return, they take a long time to respond to treatment.
The relatively immediate response of symptoms on discontinuation to the
reinstitution of treatment points towards a withdrawal problem.
Third the features of withdrawal may overlap with features of the nervous
problem for which you were first treated - both may contain elements of
anxiety and of depression. However withdrawal will also often contain new
features not in the original state such as pins and needles, tingling sensations,
electric shock sensations, pain and a general flu-like feeling.
Before starting to withdraw, it should be noted that many people will have no
problems on withdrawing. Some will have minimal problems, which may peak
after a few days before diminishing. Symptoms can remain for some weeks
or months. Others will have greater problems, which can be helped by the
management plan outlined below.
Finally however there will be a group of people who are simply unable to stop
whatever approach they take. Some others will be able to stop but will find
problems persisting for months or years afterwards. It is important to
recognise this latter possibility in order to avoid punishing yourself. Specialist
help may make a difference for some people in these two groups, if only to
provide possible antidotes to attenuate the problems of ongoing SSRIs such
as loss of libido.
HOW TO WITHDRAW
If there are any hints of problems on withdrawal from SSRIs, the management
of withdrawal is something to be done in consultation with your physician. You
may wish to show this to your doctor. Over-rapid withdrawal may be
medically hazardous, particularly in older persons.
Many doctors suggest you withdraw by taking one pill every other day for a
few weeks before stopping. There is no guideline that advocates this or
evidence that supports it and the approach is misguided.
One of the first steps to consider is getting a liquid formulation of your
antidepressant. This can be done by asking your doctor to approach the local
primary care pharmacist who can make an application to one of the specialist
companies such as Martindales or Rosemount that can make up a liquid
formulation of almost any antidepressant you might be on see below.
There are 2 theories about what leads to dependence and withdrawal that
dictate slightly differing management plans.
One theory is that the relatively short half life of paroxetine and venlafaxine
make these two drugs more problematic. This leads to a withdrawal strategy
that advocates switching from paroxetine or other drugs to fluoxetine.
The second is that paroxetine and venlafaxine are relatively more potent
serotonin reuptake inhibitors and this theory leads to a switch to less potent
serotonin reuptake inhibitors such as citalopram or one of the older
antidepressants such as imipramine.
Either approach is facilitated by having access to treatment in liquid form.
Paroxetine, fluoxetine and imipramine come in liquid form and anyone having
difficulties with withdrawal should insist on access to the liquid form of
treatment or either these or a special formulation of the drug they are on.
The Half-Life Approach
1A Convert the dose of SSRI you are on to an equivalent dose of Prozac
liquid. Seroxat/Paxil 20mg, Efexor 75mg, Cipramil/Celexa 20mgs,
Lustral/Zoloft 50mgs are equivalent to 20mg of Prozac liquid. Or 40 mg of
Paxil/Seroxat to 40 mg Prozac. The rationale for this is that Prozac has a very
long half-life, which helps to minimise withdrawal problems. The liquid form
permits the dose to be reduced more slowly than can be done with pills.
Some people may become agitated on switching from Paxil/Seroxat to
fluoxetine in which cases one option is take a short course of diazepam until
this settles down. Whether this agitation is caused by fluoxetine or because
for some people the substitution simply cannot be made may be difficult to
determine. If the agitation gets better when the dose of fluoxetine is reduced
then its more likely to be caused by fluoxetine, if it gets worse, then it is more
likely to be linked to withdrawal.
1B A further option is to convert to a liquid form of whatever drug you are
on. Many people cannot change easily from paroxetine tablets to fluoxetine
and switching to paroxetine liquid may do the trick instead.
1C Yet another option is to change from paroxetine to a mixture of half the
previous dose in the form of paroxetine and the other half in the form of
fluoxetine, and then to reduce the dose of paroxetine gradually.
The Reduced Potency Approach
1A Taking this approach, the best option is to change to Imipramine
100mg. This comes in 25mg and 10 mg tablets and also in liquid form. It is
the first serotonin reuptake inhibitor. It is much less potent than the SSRIs,
and has been used widely for children for a range of problems.
1B As above another option is to have a mixture of 50 mg imipramine with
10 mg paroxetine or fluoxetine.
Next Steps
2 Stabilise on one of these options for up to 4 weeks before proceeding.
3 For uncomplicated withdrawal, it may be possible to then drop the dose
by a quarter.
4 If there has been no problem with step 2, a week or two later, the dose
can be reduced to half of the original.
Alternatively if there has been a problem with the original drop, the
dose should be reduced by 1 mg amounts in weekly or two weekly
decrements.
5 From a dose of fluoxetine 10mgs liquid or tablets or imipramine 10mg
tablets or liquid, consider reducing by 1mg every week over the course of
several weeks - or months if need be. ( a syringe is helpful in reducing the
dose evenly).
6 If there are difficulties at any particular stage the answer is to wait at
that stage for a longer period of time before reducing further
Complexities of Withdrawal
Some people are extremely sensitive to withdrawal effects. If there are
problems with step 1 above, return to the original dose and from there reduce
as tolerated.
Withdrawal and dependence are physical phenomena. But some people can
get understandably phobic about withdrawal particularly if the experience is
literally shocking. If you think you have become phobic, a clinical psychologist
or nurse therapist may be able to help manage any phobic element.
Self-help support groups can be invaluable. Join one. If there is none nearby,
consider setting one up. There will be lots of others with a similar problem.
An alternate approach is to substitute St Johns Wort or an antihistamine for
the SSRI, as these both have serotonin reuptake inhibiting properties. If a
dose of 3 tablets of St Johns Wort is tolerated instead of the SSRI, this can
then be reduced slowly by one pill per fortnight or even per month or by
halving tablets.
If withdrawal problems appear to ease off and then come back, it is worth
checking whether this was because the affected person was co-incidentally
treating themselves with something like St Johns Wort or an antihistamine.
Some people for understandable reasons may prefer this approach. But it
needs to be noted that St Johns Wort and the antihistamines come with their
own set of problems.
While SSRI withdrawal may not be a problem for some people, for others it
can last months and indeed years possibly 2-4 years. Even if it endures for
months/years, it does seem likely to clear up in the long run.
In the case of enduring problems, being active is probably important. An
enduring problem is likely to be underpinned by some brain change that can
only be reversed by encouraging activity in that brain area through physical
and mental activity. Gentle but regular exercise and involvement in activities
rather than withdrawal seems more likely to stimulate silenced brain areas
back into life.
If it seems impossible to withdraw and the option is to stabilise on an SSRI for
the foreseeable future, at this point there is no clear indicator as to whether
there is a best SSRI to stabilise on. In terms of ongoing problems paroxetine,
sertraline, venlafaxine and duloxetine are associated with a high frequency of
problems on withdrawal and on this basis seem poor fall-back options.
Fluoxetine is associated with proportionally the greatest frequency of reports
of drug seeking or addictive behaviours, and is problematic from this point of
view. By default this leaves citalopram as a fallback option
FOLLOW-UP
Companies have tried to label withdrawal problems as discontinuation
problems or discontinuation syndromes, because of the negative perceptions
linked to the term withdrawal.
The problems posed by withdrawal may stabilise to the point where you can
get on with life. But whether it is or is not possible to withdraw, it is important
to note ongoing problems and to get your physician or someone to report
them if possible to the appropriate bodies such as the FDA/MHRA. New
health problems such as diabetes or raised blood lipid levels may have a link
to prior or ongoing treatment. If your doctor wont report these problems, you
should if you live in a place where this can be done.
There are clear effects on the heart from SSRIs and from some there are
likely to be cardiac problems during the post-withdrawal period. Such
problems if they occur should be noted and recorded. SSRIs can also
increase the risks of haemorrhage, especially if combined with aspirin, and of
fractures.
SSRIs are well-known to impair sexual functioning. The conventional view
has been that once the drug is stopped, functioning comes back to normal.
There are indicators however that this may not be true for everyone. If sexual
functioning remains abnormal, this should be brought to the attention of your
physician, who will hopefully report it.
Withdrawal may reveal other continuing problems, similar to the ongoing
sexual dysfunction problem, such as memory or other problems. It is
important to report these. The best way to find a remedy is to bring the
problem to the attention of as many people as possible.
Pregnancy
The single most important group who need to be aware of all these issues are
women of child-bearing years. A very large number of pregnancies happen in
an unplanned fashion and are several weeks advanced before the woman is
aware of the situation. SSRIs, and paroxetine in particular, are now clearly
linked to a number of problems in pregnancy, among which are an increased
frequency of birth defects, an increased rate of miscarriage, premature birth,
low birth weight, a neonatal withdrawal syndrome and pulmonary
hypertension in the newborn infant.
One of the biggest problems of SSRI dependence involves women who are
on treatment and unable to stop who wish to become pregnant. Getting off an
SSRI at present seems more difficult for women than men, even with the
incentive of wishing to become pregnant
1. Rosemont Pharmaceuticals (Tel 0113 244 1999)
These prepare large batches (so may be cheaper) for:
Amitriptyline 10mg/5ml, 25mg/5ml, 50mg/5ml
Lofepramine 70mg/5ml
Mirtazapine 15mg/1ml
Venlafaxine 75mg/5ml
Sertraline 50mg/5ml
Dosulepin 25mg/5ml, 75mg/5ml
2. Cardinal Health, Martindale (Tel 0800 137 627)
This manufacturer will usually prepare what you ask for, so if the antidepressant isn't in the
above list opt for this.
Large chain pharmacies like Boots or Rowlands may have their own external supplier who
they may prefer to use as they have a contract with them
One theory is that the relatively short half life of paroxetine and venlafaxine make these two drugs more problematic. This leads to a withdrawal strategy that advocates switching from paroxetine or other drugs to fluoxetine.The second is that paroxetine and venlafaxine are relatively more potent serotonin reuptake inhibitors and this theory leads to a switch to less potent serotonin reuptake inhibitors such as citalopram
see also -