Day 7
Lars Edvinsson: Treatment spotlight: Anti CGRP treatments for
migraine
How does CGRP work in the trigeminal system?
1990- CGRP discovered – only single molecule released during a migraine
attack. (Himself and Prof Goadsby).
Monoclonal antibodies – way to produce something to block the CGRP.
1.Go to receptor and block receptor itself
2. Pacman style inactivates CGRP
CGRP – stored in the trigeminal ganglion – activated and then released
into the head.
The monoclonal antibodies DON’T affect the release of CGRP. They either;
1.Block the receptor
2. Mop it up
Currently pending approval FDA & NICE.
*First CGRP antibody has actually been FDA approved since the summit
(May 2018)
Clinical trials
CGRP antibody or CGRP antibody receptor
- Fairly
similar in effect
- Side
effects similar to placebo
- Important
to note that this is NOT a cure.
There have been some “super
responders” – complete remission as a result of CGRP
treatment. These are a sub
population but it is possible!
What can average patient expect?
- No
side effects
- Cost
is an issue (currently very expensive)
- Blessing
for those it does work for
- Hard
to predict who will have a really good outcome from it (very early stages)
Safe & effective is main priority at this stage.
Molecule for acute treatment coming soon too – hiccup along the way with
that though (something bothered the liver).
Hopefully we will end up with; CGRP receptor blocker acute g-pant
Triptans block the release of CGRP so the combination of the two could
work well together. CGRP won’t have the same side effect of triptans though.
Who is a good candidate for CGRP?
- No
particular group
- No
long-term results yet so hard to say
- Pregnant
woman/ children? Biology of CGRP means it should in theory be fine but need to
learn more
*Interesting to note during the 2nd & 3rd trimester
migraine disappears (level of CGRP elevated). Desensitizing CGRP. Then
migraines back when they have the baby and CGRP normal.
Big pharmaceuticals have CGRP in the pipeline.
G-pants – oral – acute – separate class of drug
Antibodies – injection once a month – preventative- injection patients
take themselves (subcutaneous injection)
CGRP receptor and CGRP receptor antibodies;
- Phase
3 trials at last stage
- Phase
4, further studies ongoing
Day 7
Richard Lipton: Treatment spotlight, Triptans & Rebound
headaches
Medication overuse headache (MOH)- Secondary headache disorder like
brain tumour etc.
Rebound headache/MOH basically the same thing.
Medications used to treat headache – when used too much can cause MOH
headache disorder.
MO: More meds (opioids and
narcotics etc)- worse head gets over time.
MOH: Not meant to be judgmental.
Just another factor causing headaches. Not addiction! Can be very difficult if
in pattern of MOH.
How common?
- MO:
1-2% of general population
- About
as common as epilepsy
Do I have it?
- History/pattern
(infrequent to frequent headaches)
- Codeine
for example (end of dosing interval headaches, pain comes back just before next
dose)
- Headache
itself not being treated
- Use
of caffeine containing products
- Profile:
accelerating headache (more meds they take, over time, the worse the headache
becomes.
- Worse in
morning and sometimes weekends (people have slept through usual dose of morning
medication)
What medications are involved?
- Triptans
although hard to get hold of enough in a month
- Occasionally
with anti-inflammatories (less likely)
- Opioids/barbiturates
most troublesome
Acute medication should be
taken 2-3 days MAX per week
Help – I take 5 days a week – what can I do?
- Avoid
triggers
- Find
a preventative that works
- Take
acute medication early but don’t take too much (really tricky in practice to do
this) – much easier to achieve if you can reduce overall headache frequency
with a preventative.
*Issue of people desperately trying to avoid MOH – end up delaying acute
meds and then
take them too late and they don’t work.
Preventative meds – generally
don’t cause MOH (sometimes a worsening when people come off
these drugs for a brief period).
What if I have more than one pain condition?
- Research
shows that pain disorders travel together
- People
who have pain in multiple bodily areas are more likely to suffer from headache
and these people are more likely to have episodic migraine that turns to
chronic
- Preventatives
- Physio
- CBT
- Tens
machine
- Antidepressants
- Restrict
acute number of days taking meds
- Neuromodulation
(2 FDA approved) can be good option for people with MOH to use on a daily basis
but also for acute attacks instead of pain medication.