NeuroPsychiatirc Disorders Flashcards
What percentage of pt see remission for antidepressants?
30%
What is SLC6A4?
It is the serotonin transporter gene
What are the SLC6A4 type of allele?
Short doenst have 44bp insertion (more depression)
Long does have the 44 bp insertion
more common in whites the long allele
Asian more common to have the SS allele
Does gender play a role in SLC6A4 gene?
Yes females have a better response to Antidepressant if they have one L allele
Jama study
Pt with PGx information got drugs within 30 days
Approx 1000 each side
50% of population stop antidepressant
This helps remission faster
2D6 relation with Amitriptyline and Nortriptyline?
Hydroxylation to drug and they are directly correlated
CPIC for TCA PM?
Do not start TCA
If need to 50% dose reduction
CPIC for TCA IM?
25% reduction of dose
CPIC for TCA NM?
Regular dose
CPIC for TCA UM?
Avoid bc lack of efficacy of treatment
If needed consider increase dose
Amitriptyline and Nortriptyline how do they work?
They are the parent drug and the high the levels the better the efficacy
CPIC for 2C19 Tertiary Amines PM
Avoid - moderate
If need to use 50% reduction
CPIC for 2C19 Tertiary IM
Regular starting dose
CPIC for 2C19 Tertiary amines NM
Starting dose
CPIC for 2C19 tertiary UM
Avoid bc no effect and use a secondary amine
CPIC 2C19 for Citalopram and Escitalopram PM
Select alternative
Or lower dose by 50%
CPIC 2C19 for Citalopram and Escitalopram IM
Staring dose
CPIC 2C19 for Citalopram and Escitalopram NM
Starting dose
CPIC 2C19 for Citalopram and Escitalopram UM
Select alternative
If need to use high dose required
Study with Citalopram and QTc?
Found that more prevalent QTc in PM and pt on 2C19 inhibitors (cimetidine)
Max 20mg dose
CPIC for 2C19 for Sertraline PM
Alternative or 50% reduce
CPIC for 2C19 for Sertraline IM
Starting dose
CPIC for 2C19 for Sertraline NM
Standard dose
CPIC for 2C19 for Sertraline UM
Starting dose
CPIC for 2B6 for Sertraline PM
Alternative drug if use 25%
Optional
CPIC for 2B6 for Sertraline IM
Standard dose
CPIC for 2B6 for Sertraline NM
Standard dose
CPIC for 2B6 for Sertraline UM
Standard dose
CPIC for 2D6 Paroxetine PM
50% reduce in dose
Titration 50% slower
Maintenance 50% less
CPIC for 2D6 Paroxetine IM
Lower starting dose
Optional
CPIC for 2D6 Paroxetine NM
Standard therapy
CPIC for 2D6 Paroxetine UM
Select drug alternative
CPIC for 2D6 Venlafaxine PM
Consider alternative
Optional
CPIC for 2D6 Venlafaxine IM
No recommendations
CPIC for 2D6 Venlafaxine NM
Starting dose
CPIC for 2D6 Venlafaxine UM
No action
CPIC for 2D6 Vortioxetine PM
50% reduction of dose w/ a max of 10mg
Optional
CPIC for 2D6 Vortioxetine IM
Standard
CPIC for 2D6 Vortioxetine NM
Standard
CPIC for 2D6 Vortioxetine UM
Select alternative
If must use 50% increase in dose
Optional
Is genotype for antidepressant required?
NO
Which polymorphism is most abundant in antidepressant?
2D6
Which allele cause an increase in Steven Johnson for Carbamazepine?
HLA - A31:01
HLA - B15:08, 11, 21
Population of HLA - A and B mutations
Hans Chinese, Singapore, Malaysian
Low in Japanese Koreans
What pt are 100% risk for SJ syndrome
1 or 2 alleles fo HLA-B*1502
And of Han-Chinese
Why is HLA-B*1502 so important
Affects all the anti seizure meds Lam, Oxcarb, phen, carbamazepine
Must be han-Chinese too
HLA-B*3101 predicted effect?
Also Carbamazepine in Euro and Korean, Japanese
What race do we test for with Anti-seizure meds?
all Asians
CPIC Carbamazepine non carrier of HLA - B1502 and carrier HLA-A3101
CBZ naive with alternatives - use alternative
CBZ naive w/o alternative - use CBZ with close monitoring
CBZ > 3 months use with caution
CPIC Carbamazepine non carrier HLA - B1502 and non carrier HLA-A3101
Standard dosing
CPIC Oxcarbazepine carrier of HLA - B*1502
Increase risk
CBZ naive - do not use
If on CBZ > 3 months use with caution
CPIC Oxcarbazepine NON carrier of HLA - B*1502
Standard dosing
What is the relation with 2C19*3 allele and Phenytoin
Can clear the drug and have increase in cutaneous reactions
Clinical algorithm for Phenytoin HLA-B*15:02 positive
Do not use
Clinical algorithm for Phenytoin HLA-B*15:02 negative and 2C19 NM and UM
No adjustments
Clinical algorithm for Phenytoin HLA-B*15:02 negative and 2C19 IM
First dose normal
Only for 1 score IM Following doses 25% less
Clinical algorithm for Phenytoin HLA-B*15:02 negative and 2C19 PM
First dose normal
Following doses 50% less
What is a 1 score for phenytoin and 2C19
1/3, 2/2